Scarcity Of Raw Materials Research Articles

Natural geometrical variations of Italian Phyllostachys edulis bamboo culms for construction purposes

Amid the increasing scarcity of raw materials, utilizing bamboo as a renewable building material offers significant environmental and economic benefits for the European construction sector. However, in Europe, the use of bamboo for construction remains limited due to a lack of studies on geometrical and material characteristics of European-cultivated bamboo species. Although bamboo is not typically grown in Europe, the number of bamboo plantations is steadily increasing in countries like Spain, France and Italy. Bamboos growing in temperate climates, however, are exposed to different environmental conditions during growth compared to bamboos from subtropical and tropical climates, such as those in China or Vietnam. As bamboo’s geometric properties are strongly influenced by the environmental conditions during growth, it is essential to investigate how bamboo culms of the same species grown in Europe compare to those from other regions. The present article reports findings on the geometry and geometric imperfections of 90 four-meter Italian bamboo culms. First, the Italian Phyllostachys edulis bamboo culms examined in this study are briefly introduced. Following, geometric imperfections of bamboo culms are defined, and the geometry measurement concept is presented. Subsequently, variations in internode lengths, diameters, wall thicknesses, ovalities, stem tapers and pre-deflections are described and analyzed. Finally, the findings from the Italian culms are compared with those from Asian Phyllostachys edulis. In summary, this article enhances the understanding of the geometric properties of bamboo grown in Europe, thereby advancing the use of cultivated bamboo culms in Europe and improving the overall understanding of bamboo characteristics across different climatic zones.

Efficient synthesis of salidroside from tyrosol based on UDPG recycling system

Salidroside is a functional ingredient with wide applications in food and pharmaceutical fields. It is conventionally produced by extraction from plants, the application of which is limited by the scarcity of raw materials and cumbersome process. This study achieved the efficient production of salidroside by biosynthesis with tyrosol as the substrate. While utilizing glycosyltransferases for tyrosol glycosylation, we introduced sucrose synthase to construct the uridine diphosphate glucose (UDPG) recycling system. The glycosyltransferase UGT33 and sucrose synthase AtSUS were screened out by comparison, and the recombinant strain Escherichia coli BL21/pETDuet-AtSUS-UGT33 was constructed. The copy number of the gene was optimized and the optimal copy number ratio of glycosyltransferase to sucrose synthase was determined to be 3:1. The whole-cell transformation conditions (temperature, pH, inoculum amount, substrate concentration, and concentrations of metal ions) of the recombinant strain were optimized, and the highest yield of salidroside reached 8.17 g/L after fermentation under the optimal conditions in a 5 L fermenter for 24 h. This study provides a reference for the efficient production of salidroside by microorganisms.

Mechanical properties of blended cements affected by impurities in thermally activated clays

Abstract With the scarcity of raw materials, energy intensiveness and environmental burden connected with producing Portland cement, there is a growing need to find substitute binders. Thermally activated clay also appears to be a suitable material for partial cement replacement. However, not all clays are the same. It depends very much on the place of collection, its chemical and phase composition, and the activation temperature. This study compared six different types of clays fired at 600 °C in terms of quantitative phase analysis and mechanical strength results. In addition to the fineness of grinding and firing temperature, the clay composition had an immense impact on mechanical properties. Content of illite up to 20% was found to be beneficial, as this clay reached the highest mechanical strengths. Regarding the quartz, its presence did not harm the overall performance of thermally activated clays and the presence of calcite could cause the improvement of the mechanical strengths. However, the clay with the most miscellaneous composition caused the deterioration of compressive strength but reached much higher bending strength compared to pure cement.

Impact of Shortage of Raw Materials on the Manufacturing Process in Automobile Industry

The shortage of raw materials in the automobile industry has had a significant impact on the manufacturing process, leading to disruptions at multiple levels. With key materials such as semiconductors, steel, and aluminum in short supply, manufacturers have faced delays in production schedules, increased costs, and inefficiencies in supply chain management. This shortage has also forced many companies to adjust their production strategies, often by scaling down output or prioritizing certain models, which can lead to bottlenecks in delivering products to the market. Moreover, the scarcity of raw materials drives up procurement costs, further squeezing profit margins for automobile manufacturers. The long-term effects of this shortage may include shifts towards more sustainable and alternative materials, as well as greater investment in localized supply chains to reduce dependency on global sources. Ultimately, the raw material shortage poses a challenge to both the operational efficiency and the competitive edge of the automobile industry.

Glass a Scarce Commodity

The adoption of glass reuse in construction faces challenges due to higher costs and more perceived risks compared to new glass. This conflicts with the goal of a circular economy. To challenge this status quo, this article explores a hypothetical scenario where glass becomes a scarce commodity. What if the float glass production process ceases to exist due to energy resource depletion, raw material scarcity, or carbon budget constraints? In such a context, glass reuse will be crucial. This article discusses the design, logistics and quality related challenges of reusing float glass, including structural integrity and energy performance considerations. Additionally, this article investigates the potential for glass reuse by analysing ongoing and future research, supply-demand dynamics, innovative building design, the concept of the future glass factory, and the re-evaluation and promotion of regulatory frameworks. To promote glass reuse, the article emphasizes customization over standardization. Considering the diverse dynamics of projects, from high-rise buildings to terraced houses, and varying regional construction requirements, solutions must be specific and adaptable, rather than standardized.

Realizing thermoelectric cooling and power generation in N-type PbS0.6Se0.4 via lattice plainification and interstitial doping

Thermoelectrics have great potential for use in waste heat recovery to improve energy utilization. Moreover, serving as a solid-state heat pump, they have found practical application in cooling electronic products. Nevertheless, the scarcity of commercial Bi2Te3 raw materials has impeded the sustainable and widespread application of thermoelectric technology. In this study, we developed a low-cost and earth-abundant PbS compound with impressive thermoelectric performance. The optimized n-type PbS material achieved a record-high room temperature ZT of 0.64 in this system. Additionally, the first thermoelectric cooling device based on n-type PbS was fabricated, which exhibits a remarkable cooling temperature difference of ~36.9 K at room temperature. Meanwhile, the power generation efficiency of a single-leg device employing our n-type PbS material reaches ~8%, showing significant potential in harvesting waste heat into valuable electrical power. This study demonstrates the feasibility of sustainable n-type PbS as a viable alternative to commercial Bi2Te3, thereby extending the application of thermoelectrics.

Assessing The Supply Chain Risks of an Indonesian Electricity Company

Energy is a crucial necessity for human societies, and access to electrical energy plays a significant role in economic development. A state-owned enterprise (SOE) is entrusted with the provision of electrical energy across Indonesia. The objective of this study is to identify and assess risk factors within the supply chain of primary distribution materials at SOE. The identification of risk factors was based on a comprehensive review of literature across various industrial sectors, further validated through consultations with senior managers at the company. For the assessment of these risks, the study employed the modified Decision Matrix Risk Assessment methodology, which involves evaluating risks based on their likelihood and impact. This evaluation was conducted through surveys distributed to 66 respondents, including planning managers, distribution managers, and commercial managers across all regional and distribution main units in Indonesia. Two risk categories with five sub-categories and a total of 27 risk factors were identified. Supply-related risks are the most significant compared to the other four sub-categories. Scarcity of raw materials, lack of capacity flexibility, and failure to make delivery requirements are in the top three rankings. This research can enrich the supply chain risk literature and provide valuable insights for utility managers in understanding supply chain risks.

Transformational green sustainable concepts in the field of infrastructure

In this comprehensive study, we explore the multifaceted world of green sustainable construction, highlighting innovative techniques and materials. This article presents an insightful exploration of green sustainable construction, focusing on the crucial aspects of architectural design, judicious material selection, and the adoption of optimal structural designs. Through comprehensive literature research supplemented by practical examples, it highlights several innovative construction methodologies that are at the forefront of green sustainable development. These include the use of lightweight framing, cladding systems, autoclaved aerated concrete (AAC), rammed earth, and straw bale construction, each contributing uniquely to environmental sustainability. The study brings to light the looming issue of raw material scarcity due to excessive exploitation, urging for sustainable material management in construction. It stresses the urgency of implementing effective pollution control measures within the construction sector, asserting that such practices are not just beneficial but essential for environmental conservation and sustainable development. This research contributes significantly to the field by providing a foundation for future exploration and advancements in sustainable construction practices.

Carbon Assessment of a Wooden Single-Family Building—Focusing on Re-Used Building Products

Previous research has shown a lack of studies with comparisons between primary (virgin) and secondary (re-used) building materials, and their embodied emissions. The creation of different scenarios comparing the environmental impact of virgin vs. re-used materials is also motivated by the scarcity of raw materials in the world and the emergency of mitigating greenhouse gas (GHG) emissions from buildings. The aim of this study was to investigate scenarios, including new vs. re-used building products, applying the LCA method for a wooden single-family building. The findings showed a 23% reduction potential for total released (positive) CO2e when comparing the Reference scenario with Scenario I, using re-used wooden-based materials. Further, Scenario II, using all re-used building materials except for installations, showed a 59% CO2e reduction potential compared to the Reference scenario. Finally, Scenario III, which assumes all re-used building products, showed a 92% decreased global warming potential (GWP) impact compared to the Reference scenario. However, when including biogenic carbon and benefits (A5 and D module), the Reference scenario, based on newly produced wooden building materials, has the largest negative GHG emissions. It can be concluded that the re-use of building products leads to significant carbon savings compared to using new building products.

A novel integrating approach to assess the role of LiFePO4 battery recycling in the automotive industries in the Greater Bay Area of China

Amidst the swift progression and extensive use of electric vehicles, demands on lithium iron phosphate (LiFePO4) batteries have surged, leading to an imminent scarcity of raw materials for battery manufacturing. This reality heightens the needs for effective battery recycling. This study outlines an integrated evaluation approach of combining laboratory-scale pilot experiment, Monte Carlo Simulations, and Life Cycle Assessment (LCA). An optimized recycling process for LiFePO4 batteries was developed, aiming to salvage and retrieve valuable elements. The process involves lithium's selective leaching followed by subsequent lithium (Li) and iron (Fe) recovery, achieving efficient recovery rates for both Li and Fe. A novel evaluation, integrating economic and environmental aspects, was conducted by employing a direct costs/revenues approach, with the inclusion of stochastic uncertainties determined via Monte Carlo Simulation. Two scenarios are applied to the electric vehicles data of Guangzhou in 2022. The recycling strategy of spent lithium-ion batteries (LIBs) within the Greater Bay Area of China (Scenario A) could potentially save 373.2 million US$, and reduce carbon dioxide emissions by 96,850 tons, compared to manufacturing batteries from mined raw materials and long-distance transportation (Scenario B). This demonstrates the importance of localized, efficient industrial automotive chain within the Greater Bay Area, which besides being cost-effective, offers profound environmental benefits. Other important factors for the result are the efficiency of the developed hydrometallurgical process, the price of the sellable material, and the transport distance. Scenario modeling results from the developed integrating evaluation clearly reveal the significant potential of battery recycling, and the innovative integrating approach has the potential for broader applicability beyond the specific context of our study.

A prospective life cycle assessment of global ammonia decarbonisation scenarios

A prospective life cycle assessment was performed for global ammonia production across 26 regions from 2020 to 2050. The analysis was based on the IEA Ammonia Roadmap and IMAGE electricity scenarios model for three climate scenarios related to a mean surface temperature increase of 3.5 °C, 2.0 °C, and 1.5 °C by 2100. Combining these models with a global perspective and new life cycle inventories improves ammonia's robustness, quality, and applicability in prospective life cycle assessments. It reveals that complete decarbonisation of the ammonia industry by 2050 is unlikely from a life cycle perspective because of residual emissions in the supply chain, even in the most ambitious scenario. However, strong policies in the 1.5 °C scenario could significantly reduce climate impacts by up to 70% per kilogram of ammonia. The cumulative greenhouse gas emissions from the ammonia supply chain between 2020 and 2050 are estimated at 24, 21, and 15 gigatonnes CO2-equivalent for the 3.5 °C, 2.0 °C, and 1.5 °C scenarios, respectively. The paper examines challenges in achieving these scenarios, noting that electrolysis-based (yellow) ammonia, contingent on electricity decarbonisation, offers a cleaner production pathway. However, achieving significant GHG reductions is complex, requiring advancements in technologies with lower readiness, like carbon capture and storage and methane pyrolysis. The study also discusses limitations such as the need to reduce urea demand, potential growth in ammonia as a fuel, reliance on CO2 transport and storage, expansion of renewable energy, raw material scarcity, and the longevity of existing plants. It highlights potential shifts in environmental impacts, such as increased land, metal, and mineral use in scenarios with growing renewable electricity and bioenergy with carbon capture and storage.

Pengendalian Persediaan Bahan Baku Untuk Lemari Tipe Sliding Door Glass (Studi Kasus di PT Alba Unggul Metal)

PT Alba Unggul Metal faced several operational problems in its production activities. In this study, the focus is on standard products owned by PT Alba Unggul Metal, especially SDG type cabinets, due to delays in delivery schedules caused by scarcity of raw materials, most are SDG type cabinets. The purpose of this study was to plan the raw material requirements for SDG type cabinets so that there is no scarcity of raw materials in the warehouse. The method used is the Economic Order Quantity method, the Period Order Quantity method and the Min-Max method. After analysis and discussion, it is known that the Economic Order Quantity method is the most optimal method compared to the Period Order Quantity method and the Min-Max method. Then the Company can better control inventory and delivery time of raw materials by using the EOQ method. As an example of the calculation for an SD SPCC plate measuring 0.7mm x 2440mm x 1220mm with an optimal order quantity of 512 pieces for one order, 157 safety stocks, reorder point when stock is 493 sheets, and order frequency 24 times a year. After implementation and data sampling for three months in April, May and June 2023 there was no shortage of raw materials which caused a delay in the delivery schedule for SDG type cabinets.Keywords : Inventory control, Economic Order Quantity, Period Order Quantity, Min-Max, Reorder Point, Safety Stock.

Evaluation of the Mechanical Performance of Warm Bio-Recycled Asphalt Mixtures

Currently, approximately 90% of road pavement mixtures are derived from fossil fuels, a major source of the greenhouse gases contributing to global warming. This fact, together with the scarcity of raw materials in pavement engineering, has prompted recent investigations into sustainable alternatives. Biobinders, serving as substitutes or modifiers for petroleum-based asphalt binders, have gained attention, alongside the integration of recycled materials in recycled asphalt (RA). This study addresses these concerns by combining three techniques: (1) substituting a bitumen-based binder with a biobinder; (2) incorporating a high RA percentage (>30%); and (3) manufacturing the asphalt mixture at a reduced temperature (140 °C). These approaches result in the production and evaluation of warm bio-recycled asphalt mixtures. Materials were assessed at both the binder and mixture levels. The control binder, RA binder, and biobinder underwent conventional and rheological characterization. In terms of mixtures, warm bio-recycled asphalt mixtures employed a biobinder as the only virgin binder, with RA contents of 50% and 70%. Mechanical characterization focused on bearing capacity, cohesion, permanent deformations, and moisture damage. The warm bio-recycled asphalt mixtures exhibited adequate outcomes in bearing capacity through the stiffness modulus being 18,120 MPa and 15,683 MPa for bio-recycled asphalt with 50% RA and bio-recycled asphalt with 70% RA, respectively. Bio-recycled asphalt with 50% RA and bio-recycled asphalt with 70% RA showed low permanent deformation percentages, specifically 0.5% and 0.7%, respectively, in comparison to the reference recycled asphalt mixture with 1.5%, allaying concerns in practical applications due to the biobinder’s soft consistency. The bio-recycled asphalt mixture with 70% RA displayed good mechanical performance regarding the studied mechanical characterization, especially exhibiting the least susceptibility to water-induced damage with 97% of the retained indirect tensile strength ratio, addressing concerns related to moisture damage in warm asphalt mixtures with high RA content and biobinders. These findings offer valuable insights into the adoption of more sustainable practices in the asphalt pavement industry, reducing the concerns associated with warm bio-recycled asphalt mixtures.

Cradle-to-Gate Life Cycle Assessment (LCA) of GaN Power Semiconductor Device

Wide Band Gap (WBG) semiconductors have the potential to provide significant improvements in energy efficiency over conventional silicon (Si) semiconductors. While the potential for energy efficiency gains is widely researched, the relation to the energy and resource use during manufacturing processes remains insufficiently studied. In order to appraise the performance of the technology thoroughly, issues such as raw material scarcity, toxicity and environmental impacts need to be investigated in detail. However, sparse Life Cycle Assessment (LCA) data are available for the two currently most widespread WBG semiconductor materials, gallium nitride (GaN or GaN/Si) and silicon carbide (SiC). This paper, for the first time, presents a cradle-to-gate life cycle assessment for a GaN/Si power device. To allow for a full range of indicators, life cycle assessment method EF 3.1 was used to analyze the results. The results identify environmental hotspots associated with different materials and processes: electricity consumption for the processes and clean room facilities, direct emissions of greenhouse gases, gold (when used), and volatile organic chemicals. Finally, we compare this result with publicly available data for Si, GaN and SiC power devices.

Engineering Escherichia coli for constitutive production of monophosphoryl lipid A vaccine adjuvant.

During the COVID-19 pandemic, expedient vaccine production has been slowed by the shortage of safe and effective raw materials, such as adjuvants, essential components to enhance the efficacy of vaccines. Monophosphoryl lipid A (MPLA) is a potent and safe adjuvant used in human vaccines, including the Shingles vaccine, Shingrix. 3-O-desacyl-4'-monophosphoryl lipid A (MPL), a representative MPLA adjuvant commercialized by GSK, was prepared via chemical conversion of precursors isolated from Salmonella typhimurium R595. However, the high price of these materials limits their use in premium vaccines. To combat the scarcity and high cost of safe raw materials for vaccines, we need to develop a feasible MPLA production method that is easily scaled up to meet industrial requirements. In this study, we engineered peptidoglycan and outer membrane biosynthetic pathways in Escherichia coli and developed a Escherichia coli strain, KHSC0055, that constitutively produces EcML (E. coli-produced monophosphoryl lipid A) without additives such as antibiotics or overexpression inducers. EcML production was optimized on an industrial scale via high-density fed-batch fermentation, and obtained 2.7 g of EcML (about 135,000 doses of vaccine) from a 30-L-scale fermentation. Using KHSC0055, we simplified the production process and decreased the production costs of MPLA. Then, we applied EcML purified from KHSC0055 as an adjuvant for a COVID-19 vaccine candidate (EuCorVac-19) currently in clinical trial stage III in the Philippines. By probing the efficacy and safety of EcML in humans, we established KHSC0055 as an efficient cell factory for MPLA adjuvant production.

Stone Age Ivory Points from the Arctic Zone of Northeast Asia

We give a technological and typological description of two well-preserved points (one fragmented rod-shaped, the other double-slotted), made of mammoth ivory and found in the Ust-Yansky District of Sakha-Yakutia in 2016. Traces evidencing various stages of manufacture are described in detail. A succession of technological operations is reconstructed, from the preparation of preforms and further processing by planing and abrasion to final polishing. Spall negatives on artifacts are interpreted as post-depositional damage that could have occurred from the effect of cryogenic processes in sediments. The slotted specimen is decorated with five finely engraved arrows. The discovery context and the morphology of the rod-shaped specimen are similar to those of ivory points from the Yana sites, whereas the slotted one resembles those from Zhokhovo and other Northeast Asian sites of the same age. Radiocarbon analysis of the points supports these findings. The following conclusions are reached: the rod-shaped point dates to MIS 3, and the slotted one, to MIS 2; such points evidence an elaborate technology of ivory processing during the Late Pleistocene and Early Holocene in the high latitudes of Northeast Asia and an adaptation to the scarcity of lithic raw material in the region.

ANALISIS FAKTOR-FAKTOR YANG MEMPENGARUHI KEBERLANJUTAN UMKM DI ERA PANDEMI COVID-19 (STUDI KASUS KABUPATEN SIDOARJO)

MSMEs are one of Indonesia’s national main economic pillars, with the contribution of those in Sidoarjo alone in 2019 of IDR 1.6 trillion. However, their business had to be disrupted by the rocketing cases of Corona Virus Disease (Covid) not long after. They had to struggle with sales decrease, raw material scarcity, distribution clogging, capital deficiency, and production reduction due to labor layoffs. This research aims to identify factors that influence the sustainability of MSMEs in Sidoarjo and measures required by them in order to maintain their sustainability during the pandemic. The scope of this study is the effects of business owner’s resources, environmental carrying capacity, financial management, and communication and information technology usage on the sustainability of MSMEs in Sidoarjo Regency. This research applies multivariate regression analysis and SmartPLS 4 as the statistical tools. The results of the analysis indicate that communication and information technology usage and environmental carrying capacity have significant effects on the sustainability of MSMEs in Sidoarjo during the Covid-19 pandemic, but business owner’s resources and financial management have no significant influence. Therefore, it can be concluded that capital aids, tax incentives, internal support from family, access to information technology, and digital marketing can support the sustainability of MSMEs in Sidoarjo during the Covid-19 pandemic.

Bio-bleaching of ankara pulp with xylanase-producing bacterial consortium for sustainable handmade paper production

The paper industry faces two critical challenges: the scarcity of raw materials and the environmental impact of chemical waste pollution. Addressing the first challenge involves harnessing alternative, sustainable raw materials, while the second challenge can be mitigated through the adoption of bio-bleaching processes, which significantly reduce chemical consumption while enhancing paper brightness and quality. This study proposes a solution to both challenges by using non-woody Calotropis procera (Ankara) and a xylanase-producing microbial consortium for sustainable handmade paper production, a combination not extensively explored in prior research. To evaluate this approach, the process was divided into three stages. In stage I, Ankara fibre was pulped through open hot digestion. In stage II, the pulp was subjected to bio-bleaching in two experimental setups: Set I (without sucrose) and Set II (with sucrose) for 5 days. In stage III, chemical bleaching was used to improve the final brightness of the treated pulps. A novel comparison was made between the bio-bleaching efficiency of an individual isolate g5 (BI) and a bacterial consortium (BC). This research highlighted that bio-bleaching with the consortium effectively removed lignin (140±60 mg/l) and colour (1830±50 PCU), especially in the presence of sucrose, compared to using a single xylanase isolate. Pulp residue/filtrate collected at each stage was estimated based on parameters such as colour and lignin content. After stage III (chemical bleaching), the release of colour and lignin in pulp filtrate was higher in BI compared to BC, indicating the consortium's effectiveness during bio-bleaching, which leaves fewer degradable lignin structures for the chemical bleaching stage. Papers crafted from consortium-treated pulp also exhibited higher brightness than those treated with the isolate. This study reveals the synergistic effect of microbial consortia, leading to more efficient lignin degradation and enhanced bio-bleaching capabilities, supporting the development of greener industrial processes. Ultimately, this study demonstrates a unique and eco-friendly approach to papermaking, combining C. procera and enzymatic bio-bleaching to reduce dependency on hazardous chemicals and support sustainable industry practices.

SMEs Development during the Covid-19 Pandemic: SWOT Analysis of Surabaya Metropolitan City

Small Medium Enterprises (SMEs) is activities economics to support reduce alleviation for society in Surabaya Metropolitan city during Covid-19 pandemic. Small and Medium Enterprises (SMEs) are the sector that absorbs the largest workforce in Indonesia up to 97% and is the most important part of the country’s economy. The purposed of this research will be describe about SWOT analysis of SMEs development during COVID-19 Pandemic of Surabaya Metropolitan city. This study aims to analyze and identify the factors that cause the decline in the existence of SMEs in Surabaya Metropolitan city using SWOT analysis and analysis of internal and external factors, as well as strategies for developing SMEs in Surabaya Metropolitan city. This research uses the Systematic Literature Review (SLR) approach, which uses literature in the form of journals, papers or seminar proceedings, and reports from government or private institutions, as a reference in data collection. The results of the research are in the form of development strategies according to the needs of SMEs in Surabaya Metropolitan city. Several factors also influenced the development of SMEs in Surabaya Metropolitan city, including limited capital, expensive and scarce raw materials and simple and limited production equipment, bookkeeping problems, limited marketing, problems in determining the location and layout of the business, weak managerial skills, weak resource management. Based on the results of the above analysis of several obstacles or obstacles that affect the development of SMEs in Surabaya Metropolitan city, it can be concluded that the role of the government is needed in this case to support, facilitate and or foster SMEs in Surabaya Metropolitan city which can be done through collaboration with Universities, Cooperatives Indonesia, Banks or other financial institutions and provide training to the workforce in order to create a skilled and expert workforce.

Određivanje racionalnih parametara tečne završne obrade poluproizvoda od kože koji koriste akrilni polimer i modifikovane masti

A mathematical model of the processes of liquid finishing of semi-finished leather products using modern chemical materials in the form of acrylic polymer and modified fats has been obtained, revealing the influence of the consumption of these materials on the content of substances extracted by organic solvents (the so-called unbound fat), elongation at a stress of 10 MPa and the yield of leather by area. Rational parameters of liquid finishing have been determined, allowing for more efficient use of scarce raw materials while reducing the harmful burden on the environment.