Economical Raw Material Research Articles

Natural radioactivity and technological properties of kaolinized granite from the Motajica mine, Bosnia and Herzegovina

For the production of ceramic tiles, it is necessary to use high-quality and economical raw materials, which will optimize the properties of the final product and meet the prescribed standards. For this reason, it is necessary to examine the properties of each potential raw material. This paper examines radioactivity and technological properties of kaolinized granite from the Motajica mine, in Bosnia and Herzegovina. Chemical analysis, X-ray diffraction (XRD), and thermal analysis (DTA) were carried out. In order to examine the technological (ceramic) properties of this raw material, ignition tests of the composite obtained by introducing kaolinized granite (with a content of 25 %) into the standard factory series of ceramic tiles were conducted at four selected temperatures (1050, 1100, 1120, and 1150 ℃). Total linear shrinkage, flexural strength, and water absorption were determined for the produced biscuit. Using gamma spectrometry, the activity concentrations of radionuclides 226Ra, 232Th and, 40K were measured, and then the radiation risk for external exposure of workers in the industry was assessed using hazard indices and doses. The radiation risk from the use of manufactured unglazed ceramic tiles in houses was also assessed. Statistical analysis of radionuclides for 100 samples of kaolinized granite was performed using descriptive statistics and hierarchical cluster analysis (HCA). It was observed that the average values of 226Ra, 232Th, and 40K are above the average for building materials in the world and amount respectively to 122 Bq kg−1, 96 Bq kg−1, and 1068 Bq kg−1. All other obtained values indicate that it is a quality raw material that, despite having an increased content of radioactive elements compared to the world average, does not represent a radiological hazard for workers and people who stay indoors on an annual basis. The tested raw material satisfies all technological criteria for further use and can be considered a desirable ingredient of ceramic composites because it can partially or completely replace feldspar.

Enhancement of the microwave absorption performance of flaky FeSiCr powder through the compounding of cobalt ferrite

FeSiCr/CoFe2O4 composites were prepared by mechanical ball milling of cobalt ferrite prepared by hydrothermal method and flaky FeSiCr alloy powder. The phase and element of the composites was observed by XRD and XPS. The microstructure and surface elements of the composites were observed by SEM and EDS. The findings from the analyses confirmed the successful synthesis of the FeSiCr/CoFe2O4 composites. The results of EMP tests indicated that the electromagnetic parameters were balanced and the impedance matching was improved. When the mass percentage of cobalt ferrite was 20 %, the impedance matching was the best, and the RLmin reached −41.04 dB at 4.8 GHz. And the maximum EAB reached 5.4 GHz. By adjusting the thickness of the absorber, the EAB can be extended to 9.5 GHz (2.6–12.05 GHz), encompassing the entire C-band and X-band. The EMA performance of the composites has been greatly improved. FeSiCr/CoFe2O4 composites may serve as potential microwave absorbing materials in the future due to the wide range of economical raw materials, strong microwave absorption capacity and extensive absorption frequency range.

A transparent hydrophilic coating for long-lasting anti-fogging with self-cleaning and antibacterial properties

Transparent substrates with anti-fogging properties endowed by surface hydrophilic modification have been proved to applied in various fields. In this study, a superhydrophilic coating (PAT coating) was generated on glass substrate via dip coating technique using a solution comprising polyvinyl alcohol (PVA), alkyl polyglycoside (APG1214), and tetraethoxysilane (TEOS). The plentiful hydroxyl groups present in PVA and APG1214 endow the PAT coating with high hydrophilicity for excellent anti-fogging and self-cleaning properties, and facilitate to form a stable homogeneous hydrogen-bonded crosslinked network. Meanwhile, the in situ generated tetraethoxysilane hydrolysate (TEOH) from hydrolysis of TEOS acts as a crosslinker, which can covalently connect the organic components to the glass substrate. As a result, the resulting PAT coating displays excellent stability during various mechanical and chemical durability tests. In addition, the coating exhibits antibacterial adhesion properties owing to the broad-spectrum antibacterial property of APG1214. Importantly, the PAT coating can be easily prepared with readily available and economical raw materials through a simple method under mild conditions that does not require complicated separation and purification, thereby enabling its potential industrial application.

Effect of Silver Vanadate Nanowires’ Addition on Structural and Morphological Properties of Dental Porcelain Prepared from Economic Raw Materials

In addition to many materials, silver vanadate (AgVO3) has gained interest due to its antimicrobial properties, which opens up the potential for use as an antibacterial agent for biomedical applications. This work aimed to study the effect of AgVO3 addition on the structural and morphological properties of a developed dental porcelain (DP) prepared from natural raw materials. AgVO3 nanowires, prepared by the coprecipitation method, were added in different amounts (1, 3, and 5 wt.%) to a DP mass with the initial composition of 80 wt.% feldspar, 15 wt.% quartz, and 5 wt.% kaolin, obtained by sintering the mixture at 1300 °C. The structural and morphological properties of AgVO3 and DP were investigated by X-ray powder diffraction (XRPD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS), and transmission electron microscopy (TEM). The results showed the formation of α-AgVO3 nanowires coated with semispherical metallic silver nanoparticles. Moreover, α-AgVO3 additions do not influence the structural and morphological properties of DP, with the presence of Ag and V clearly identified in the DP with the α-AgVO3 addition. Our findings highlight the potential of this novel material for use in various dental applications. Future studies need to establish the antibacterial properties of the prepared dental material.

Enhancing spinnability and properties of carbon fibers through modification of isotropic coal tar pitch precursor

Producing general-purpose carbon fibers (GPCFs) with excellent properties using an economical raw material such as coal tar pitch (CTP) holds significant importance. To synthesize carbon fibers, the spinnability of precursor material plays an important role. However, the CTP impedes flowability during the spinning process due to possessing high molecular weight complex aromatic structures. To address this limitation, CTP was blended with varying proportions of petroleum pitch (5, 10 and 20 %) and spinnability and flow behavior were analyzed using Rheology measurements. The distinct constitutional properties of petroleum pitch also contributed to alterations in both the stabilization and carbonization processes. Carbon fibers produced from 10PP showed the highest tensile strength and modulus of ∼784 MPa and ∼47 GPa, respectively. The impact of oxidative and carbonization treatments on the resultant microstructural and mechanical properties of carbon fibers was thoroughly examined using various techniques such as FTIR, XPS, XRD, SEM, Raman and UTM. The results showed that the composition of petroleum pitch influenced the stabilization of fibers which eventually affected the carbonization process and resultant properties of carbon fibers. This study offers an understanding of the connection between the precursor's composition, stabilization conditions, and mechanical properties of the resultant carbon fibers.

Current Advances in Carotenoid Production by Rhodotorula sp.

Microbial carotenoids are pigments of lipophilic nature; they are considered promising substitutes for chemically synthesized carotenoids in the food industry. Their benefits for human health have been demonstrated due to their antioxidant capacity. Yeasts of the genus Rhodotorula have genotypic characteristics that allow them to accumulate high concentrations of carotenes under certain stress conditions. The present review includes recent information covering different aspects of carotenoid production in Rhodotorula sp. fermentation. This review focuses on fermentation carotenoid production strategies, describing various economic raw materials as sources of carbon and nitrogen, the capacity for tolerance to heavy metals, and the effect of light, pH, and salts on the accumulation of carotenoids. Genetic modification strategies used to obtain strains with increased carotenoid production are described. Furthermore, using magnetic nanoparticles in the fermentation system, which could be a stress factor that increases pigment production, is considered for the first time. Rhodotorula is a potential source of high-value carotenoids with applications in the cosmetics, pharmaceutical, and food industries.

Synthesis of Monodisperse Silica Nanospheres and Titania Beads from Rotating Cylinder System

Economic raw materials such as low-grade ethanol and Tetraethyl Ortosilicate (TEOS) were adopted as reactants for the synthesis of monodisperse silica nanospheres using a Taylor Vortex flow reactor with a rotating cylinder system. Factors affecting the mean diameter and size distribution of the silica grains were investigated by changing the rotating speed of the inner cylinder and the composition of reactants. In the case of titania beads, grain diameter size was adjusted by changing the amount of precursor (titanium (IV) isopropoxide, TIP), hexadecylamine (HDA) or Potassium Chloride (KCl) and reaction temperature as well as the rotation speed of the cylinder. As a demonstrative application, titania beads could be used for the removal of organic dye as a model contaminant dissolved in an aqueous medium using a photocatalytic decomposition system.

Starch‐PHA Blend‐Based Biopolymers with Potential Food Applications

AbstractThe growing population and societal consumption patterns associated with unsustainable production routes have increased pollution levels. Because of the environmental pollution caused by petroleum‐derived plastics, it has become critical to develop an alternative biopolymer‐based biodegradable plastic for long‐term sustainability. Biopolymers are eco‐friendly due to their nontoxicity, biodegradability, stability, biocompatibility, rheological, and thermal properties. However, these polymers' production methods have hindered their progress toward a bright future of sustainable production and growth. Therefore, improved formulations and tactics are needed to develop new approaches. A range of methods for application in industry can transform Polyhydroxyalkanoates (PHAs). Due to its affordability and simplicity of use, blending is regarded as one of the most successful methods. It has various uses, from absorbable sutures to biomedical implants and ecologically friendly resins, and useful applications in food packaging. Starch is a highly economical raw material and can be processed as an affordable substrate for innovative biodegradable polymers. In contrast to lowering water vapor and oxygen permeability, the addition of cross‐linking agents to starch/PHA blends increases thermal stability, elasticity, and compatibility between the starch and PHA molecules in the films. This review focuses on the synthesis, physicochemical properties, and application of PHA‐starch blends in the food industry.

Facile preparation of CoFe alloy/carbonized bamboo fibers for broadband microwave absorption

Multi-component design and microstructural regulation are commonly used strategies by researchers to improve the microwave absorption performance of materials, and it is essential to simultaneously explore sustainable and economical raw materials as well as simple preparation methods. In this study, the economical and sustainable bamboo fibers were used as a carbon source and template, and the CoFe alloy/carbonized bamboo fibers with different content were successfully prepared by the impregnation method and calcination method by controlling the nitrate concentration and calcination temperature. The analysis results display that the appropriate CoFe alloy content on carbonized bamboo fibers with nanopores can effectively improve the electromagnetic impedance matching and electromagnetic loss, resulting in excellent microwave absorption performance. The effective bandwidth almost simultaneously covers the X-band and Ku-band. This study not only facilitates the resource utilization of plant fibers, but also provides a new idea for the research of inexpensive, lightweight, and broadband microwave-absorbing materials.

High-purity graphene and carbon nanohorns prepared by base-acid treated waste tires carbon via direct current arc plasma

As the accumulation of waste tires continues to rise year by year, effectively managing and recycling these discarded materials has become an urgent global challenge. Among various potential solutions, pyrolysis stands out due to its superior environmental compatibility and remarkable efficiency in transforming waste tires into valuable products. Thus, it is considered the most potential method for disposing these tires. In this work, waste tire powder is pyrolyzed at 560 °C to yield pyrolysis carbon black, and meanwhile, the purification effects of base-acid solutions on pyrolysis carbon black are discussed. High-purity few-layer graphene flakes and carbon nanohorns are synthesized by a direct current arc plasma with H2 and N2 as buffer gases and high-purity pyrolysis carbon black as raw material. Under an H2 atmosphere, hydrogen effectively terminates the suspended carbon bonds, preventing the formation of closed structures and facilitating the expansion of graphene sheets. During the preparation of carbon nanohorns, the nitrogen atoms rapidly bond with carbon atoms, forming essential C–N bonds. This nitrogen doping promotes the formation of carbon-based five-membered and seven-membered rings and makes the graphite lamellar change in the direction of towards negative curvature. Consequently, such change facilitates the formation of conical structures, ultimately yielding the coveted carbon nanohorns. This work not only provides an economical raw material for efficient large-scale synthesis of few-layer graphene and carbon nanohorns but also broadens the intrinsic worth of pyrolysis carbon black, which is beneficial to improving the recycling value of waste tires.

An Innovative Use of Propolis in the Production of Dipping Sauce Powder as a Functional Food to Mitigate Testicular Toxicity Induced by Cadmium Chloride: Technological and Biological Evidence.

Propolis is a common natural ingredient used in food production, food packaging, and pharmaceutical products. Therefore, the aim of our study was to prepare dipping sauce powders as an innovative functional product with a regular and spicy taste from economical raw materials with high nutritional value. The developed products were fortified with propolis powder at 250, 500, and 750 mg/kg. All studied dipping sauces were subjected to a palatability test, a nutritional evaluation, and a microbiological assay performed during 6 months of storage. In addition, an in vivo study was designed to evaluate the efficacy of these products in preventing the testicular toxicity disorders induced by cadmium chloride (CdCl2) in albino rats. Based on the palatability test, the dipping sauces supplemented with propolis at 250 mg/kg and 500 mg/kg were preferred. Moreover, all samples were safe to consume within 6 months. Biological results showed that all investigated propolis-enriched dipping sauce samples caused an improvement in all CdCl2-induced testicular histopathological and biochemical changes, especially the spicy dipping sauce powder fortified with 500 mg/kg of propolis.

Synthesis of low-cost Ti3AlC2-Ti2AlC dual MAX phase with high-electrical conductivity using economical raw materials and novel compositions

Titanium-aluminum-carbide (Ti3AlC2-Ti2AlC) dual MAX phases produced with mechanical alloying (MA) of raw materials followed by a self-propagating high-temperature synthesis (SHS) approach. The low-cost dual MAX phases have been manufactured from commercial powders of Ti, Al, TiC, and agricultural wastes-based activated carbon (AC). The effects of Ti/Al/C mole ratios and carbon sources with various prices on the surface morphology, microstructure, chemical structure, and electrical conductivity of dual MAX phases have been investigated. All synthesized MAX phases have acceptable surface morphology with hexagonal particles and high purity (78.87–99.26 %). The FESEM, EDS, XRD, and XPS analyses revealed that the AC and TiC are appropriate as carbon sources for the manufacture of Ti3AlC2-Ti2AlC dual and Ti3AlC2 single MAX phases, respectively. Moreover, the purity of the MAX phases can be controlled with Al/C ratios in raw materials composition. The AC-produced Ti3AlC2-Ti2AlC dual MAX phase with 3Ti:1.25Al:2 C displayed the highest electrical conductivity (5.631 ×106 S/m), while TiC-produced Ti3AlC2 single MAX phase with 3.25Ti:2.2Al:2 C composition has comparable electrical conductivity (2.203 ×106 S/m) and highest purity (99.26 %). This study makes available an advantageous method for low-cost synthesis of high-purity MAX phases. These understandings open up a pathway to improve synthesis protocols for low-cost and high-conductivity MAX phases in the future.

The determination of physico-chemical pasta quality indicators with the addition of millet 3,8 %

This article discusses the quality indicators of pasta products obtained by partially replacing wheat grits of the highest grade with millet ground 3.8% (of the total mass of the dough, taking into account water). The addition of millet is due to the fact that the raw materials are saturated with various vitamins. As part of the study, organoleptic and physico-chemical parameters (28% humidity) after the procedure of «pressing raw materials» were considered and the indicator of shape preservation after the «cooking» process was determined. The results obtained in terms of quality indicators meet the requirements established in the standardization documents, at the same time, the nutritional properties of the product are improved, the energy value is 337.8 kcal (proteins 10.5 g, fats 1.1 g, carbohydrates 71.4 g per 100 g of pasta), the replacement of wheat flour of the highest grade with more economic raw materials is carried out. Quality indicators are determined in accordance with TR CU 021/2011 «On food safety», TR CU 022/2011 «Food products in terms of their labeling», TR CU 029/2012 «Safety requirements for food additives, flavorings and technological aids», regulatory and technical documents GOST 31743-2017 «Pasta. General technical conditions», GOST 31964-2012 «Pasta. Acceptance rules and methods for determining quality», GOST 572-2016 «Millet millet. Technical conditions». The enrichment of pasta with millet improves the biological, nutritional properties of the product. At the same time, the use of millet as a raw material reduces the cooking time of pasta, the form after cooking will meet the established requirements.

Reconfigurable and Reprocessable Thermadapt Stress‐Free Two‐Way Shape Memory Polymers Based on a Dual Crosslinking Network with Outstanding Mechanical Properties

The reconfigurable and reprocessable thermadapt two‐way shape memory polymers (2W‐SMPs) are highly desirable for many advanced biomimetic applications, but the preparation of these polymers with economical raw materials and convenient approaches still remains a challenge. In this work, thermadapt 2W‐SMPs based on a dual crosslinking network are synthesized by linking polyethylene glycol with hydroxylated modified SBS via dynamic covalent bonds. Benefiting from the synergistic effect of combining a dynamic covalent network and a physical cross‐linking network, the thermadapt 2W‐SMPs exhibit a good balance of mechanical properties and favorable two‐way shape memory effect (2W‐SME) with the reversible actuation strain of 11.9%. The 2W‐SMPs can be reprocessed and transformed into complex 3D shapes after multiple folding processes due to the dynamic covalent exchange as well as the reversible physical crosslinking, and the obtained new samples still exhibit good 2W‐SMEs. Furthermore, the transition temperature of 2W‐SMPs is designed to be close to human body temperature, and it is manufactured into a biomimetic mimosa actuator that can undergo shape changes through finger contact and cooling. This work provides a new idea for the development of thermadapt 2W‐SMPs, and the obtained materials show great potential applications in intelligent actuators.

Function-driven design of Bacillus kochii and Filobasidium magnum co-culture to improve quality of flue-cured tobacco.

Flue-cured tobacco (FCT) is an economical raw material whose quality affects the quality and cost of the derived product. However, the time-consuming and inefficient spontaneous aging is the primary process for improving the FCT quality in the industry. In this study, a function-driven co-culture with functional microorganisms was built in response to the quality-driven need for less irritation and more aroma in FCT. The previous study has found that Bacillus kochii SC could degrade starch and protein to reduce tobacco irritation and off-flavors. The Filobasidium magnum F7 with high lipoxygenase activity was screened out for degrading higher fatty acid esters and terpenoids to promote the aroma and flavor of FCT. Co-cultivation with strain SC and F7 obtained better quality improvement than mono-culture at an initial inoculation ratio of 1:3 for 2 days, representing a significant breakthrough in efficiency and a reduction in production costs compared to the more than 2 years required for the spontaneous aging process. Through the analysis of microbial diversity, predicted flora functions, enzyme activities and volatile compositions within the mono- and co-cultivation, our study showed the formation of a function-driven co-culture between two strains through functional division of labor and nutritional feeding. Herein, the function-driven co-culture via bioaugmentation will become an increasingly implemented approach for the tobacco industry.

Impact of mechanically recovered poultry meat (MRPM) on proximate analysis and mineral profile of traditional Egyptian luncheon

Mechanically recovered poultry meat (MRPM) has widely been used as an economical raw material to replace the more expensive beef in meat products, especially emulsion type products. Therefore, this paper aimed to explore the impact of MRPM on chemical composition (moisture, protein, fat and ash) and minerals content (Ca, Fe, Cu, Mn, Zn and Mg) of luncheon produced with different percentage of MRPM (0, 10, 30, 50, 70 and 90%). The results revealed that the addition of MRPM to luncheon formulation significantly (p < 0.05) altered proximate composition and minerals content with variable degree,as higher concentration of MRPM increased fat, ash, Calcium, Iron, Copper and Manganese content and decreased moisture, protein, Zinc and Magnesium content.

Fabrication and characterization of MgB2/SS 316L superconducting wire with amorphous boron prepared by sintering and cold rolling

Magnesium diboride (MgB2) is proposed to be a highly efficient wire with zero resistivity. In this research, Mg powder and amorphous-boron sheathed with a stainless steel (SS) 316L tube and powder-in-tube (PIT) technique were used in order to create a cheaper and potential superconductor that could eventually replace the currently expensive price crystalline boron. Mixed powder was put into SS 316L tube and compacted to avoid oxidation while being sintered at a temperature of 800 °C for one hour, prior to cold rolling with various size reduction. X-ray diffraction (XRD), scanning electron microscopy (SEM), and cryogenic magnet characterization were used to evaluate the crystal structures, surface morphology, and resistivity versus temperature and SQUID measurement for all samples. The XRD analysis revealed that the majority of the MgB2 phase was produced accompanied with a small quantity of MgO and Fe phases. The results of the SEM showed particle agglomeration in the sample’s morphology. It has been found that using the size reduction up to 60 % in the cold rolling step, the critical temperature (Tc) onset of the resulting MgB2 was calculated to be 39.25 and 39.44 K, respectively. This results reveal that the fabrication of the superconducting wire can be realized using a more economic raw material and process.

Dyes removal from textile wastewater by agricultural waste as an absorbent – A review

Water pollution from the textile industry affects environmental conditions by generating large-scale effluent mixed with various dyes. Dyes are mostly organics with multiple compound structural and molecular weight variations; if not managed properly before release, they may harm the environment and organism. However, many dyes are categorized into distinct groups, and various adsorbents for dye adsorption have been identified. Among these dyes, methyl dyes, which come in multiple colours, are the most popular in research due to their availability and accessibility. It is imperative to use effective treatments using special adsorbents to remediate water contamination before discharging into streams. As awareness of environmental issues increases with time, the need for a wide range of adaptive alternative feedstock that satisfies ecological regulations has become a priority for researchers worldwide. Therefore, there is a need to develop other adsorbents from alternatively economic raw materials such as locally available industrial and mineral waste and by-products. Additionally, numerous materials have been used, prepared, or grafted from various agricultural peel-based adsorbents. Biomass is a significant source of renewable adsorption processes for hazardous compounds, including toxic organics and metals/elements. It is much cheaper, has abundance, effective adsorption capability, and reusability, have numerous advantages over conventional materials. This review focuses on using plant agricultural wastes to remove dyes. Different adsorption capacities, operating conditions, and application forms have been investigated. The adsorption kinetics and isotherms are demonstrated to illustrate the adsorbent's properties and adsorption mechanisms. • Agricultural waste is valuable because it is inexpensive, abundant, and resilience and is utilized to adsorb and remove various types of dyes. • The agricultural waste (organic peels, seeds, and leaves) demonstrated its remarkable efficacy in removing contaminants from water. • This research is gaining much attention and prominent.

Energy, economic and environmental analysis of an evacuated tube solar collector using hybrid nanofluid

Hybrid nanofluids are novel advanced fluids that improve sustainable energy production. In the current study, the performance of the evacuated tube solar collector is experimentally investigated using hybrid nanofluids of magnesium oxide and multi-walled carbon nanotubes with water base. The experiments are carried out at various weight ratios and at three flow rates ranging from 1 to 3 L/min. The results show an improvement in the optical efficiency of the collector by up to 78.1% with the increase in the weight ratio of multi-walled carbon nanotubes nanoparticles. The average heat energy gain has increased from 240 W to 495 W. The utilization of the hybrid nanofluid shows an enhancement in the inlet–outlet temperature difference of the fluid by 56% and a reduction in the area of the collector by 36%. Economic and environmental analyses are conducted to investigate the role of magnesium oxide/multi-walled carbon nanotubes hybrid nanofluid in energy savings and CO2 emission reduction. The period for Carbon Payback Time and Simple Payback Period declines by 36.2% and 34.6%, respectively, for magnesium oxide/multi-walled carbon nanotubes (50:50) hybrid nanofluid. The Energy Yield Factor reaches 27.09 throughout the lifetime of the collector. According to the findings, magnesium oxide/multi-walled carbon nanotubes hybrid nanofluid is a viable working fluid alternative to multi-walled carbon nanotubes nanofluid that provides enhanced properties and a more economical raw material cost.

MANAJEMEN PERSEDIAAN BAHAN BAKU BAWANG PUTIH GORENG PADA UKM SOFIE LOCALFOOD DI KOTA PALU

Garlic Sofie Localfood is one of the businesses engaged in agro-industry that utilizes garlic as the main raw material. Sofie Localfood's fried garlic products still have difficulty in regulating the production process, due to delays in ordering raw materials, so SMEs buy raw materials elsewhere and require more costs and sometimes the raw materials are not as expected. Raw materials are one of the most important production factors because they support the smooth running of the production process. This study aims to find out how much economic raw material purchases (EOQ) for the supply of raw materials to SMEs Sofie Localfood, to find out how much safety stock (Safety Stock) to SMEs Sofie Localfood, to find out when is the right time for SMEs Sofie Localfood to do reordering (ROP) of raw material inventory, and to find out the total inventory cost (TIC) of raw materials at UKM Sofie Localfood, This research was conducted at UKM Sofie Localfood on Jalan Zebra IV, Lorong 1 No. 5 Palu City. The selection of this location was done purposively, with the consideration that Sofie Localfood is one of the businesses that produces garlic as the main raw material for making tempeh in Palu City. This research was conducted from April to June 2021. Respondents are owners and employees of UKM Sofie Localfood who were selected as sources of information in the study, the total number of respondents is 3 people. Based on data to be obtained from Sofie Localfood's business regarding raw material inventory management issues tempe, the data analysis used is Economic Order Quantity (EOQ), Safety Stock (Safety Stock), reorder (ROP) and total inventory cost (TIC). The results of this study indicate that the management of raw material inventory at SMEs Sofie localfood using the (Economic Order Quantity) method in JanuaryDecember 2020 an average of 31.17 kg/month. Safety stock (Safety Stock) of raw materials that is always available at UKM Sofie Localfood is 14.92 kg/month. The reorder point (reorder point) that SMEs Sofie Localfood must make in April-June 2021 is an average of 77.26 kg/month. The total cost of raw material inventory for garlic in the UKM Sofie Localfood is an average of Rp.58.157.86/month.