Polypropylene Thread Research Articles

In Vitro Analysis of Pressure Resistance in the Paul Glaucoma Implant and Ahmed ClearPath 250 With and Without Polypropylene Thread Inside the Tube.

Pressure resistance characteristics of the Paul glaucoma implant (PGI) and Ahmed ClearPath 250 (ACP), with and without the insertion of polypropylene thread in their tubes, were evaluated. The in vitro flow pressure was evaluated at varying flow rates, both with and without threads (6-0 for PGI and 4-0 or 3-0 for ACP). Cross-sectional areas of the tube lumen and thread were measured to calculate pressure resistance using the Hagen-Poiseuille equation. For the PGI without the thread, the pressure remained relatively low and constant across all flow rates. In contrast, with the insertion of a 6-0 thread, there was a significant increase in pressure resistance, with the pressure increasing from 7.5mmHg at 1 µL/min to 43.8 mmHg at 5 µL/min. For the ACP, the pressure resistance remained relatively constant across all flow rates without a thread and with either 4-0 or 3-0 threads. However, the pressure was higher with 3-0 threads compared with a 4-0 thread. The actual measured pressures agreed well with theoretical values in the no-thread conditions, but were consistently higher than the theoretical values in the threaded conditions. Inserting polypropylene threads into the tubes of nonvalved glaucoma drainage devices significantly affects pressure resistance with various degree. PGI with a 6-0 polypropylene thread may not require external tube ligation to prevent hypotony, whereas ACP with a 4-0 thread likely requires additional ligation. Using a 3-0 thread in ACP may enhance pressure resistance sufficiently to avoid tube ligation, but this requires careful clinical consideration.

Optimizing Oil-Contaminated Wastewater Purification with Polypropylene Thread Waste

AbstractThe increasing generation of oil-containing wastewater poses significant environmental challenges, necessitating the development of effective and sustainable filtration materials. Polypropylene thread scraps, a waste product from textile manufacturing, present a potential low-cost alternative to industrially produced polypropylene fibrous filters. This study evaluates the filtration properties of these scraps to determine their viability for oil product removal from wastewater. The polypropylene thread scraps exhibited promising physical characteristics: a fiber diameter range of 10–120 μm, bulk density between 100 and 200 kg/m3, total porosity of 78–89%, and a specific surface area of 75 m2/kg. Their hydrophobic nature is comparable to that of commercial polypropylene filter materials. Experimental studies demonstrated that the thread scraps could effectively remove oil products at a 70% efficiency, with a maximum specific wastewater volume of 8 L/g. The oil capacity for oil products was measured at 51.1 mg/g, which decreased to 36.2 mg/g after regeneration by washing with hot water at 70 °C. The optimal filtration parameters were identified as a material packing density of 65 kg/m3, filtration speed of 3.5 m/h, and a loading height of 1.5 m, achieving removal efficiencies of 82.0% for oil products and 91.5% for suspended solids. Polypropylene thread scraps demonstrate significant potential as a sustainable filtration material for oil-containing wastewater, offering comparable performance to industrial filters. Their ability to be regenerated and reused further enhances their cost-effectiveness and environmental benefits. This research supports the use of polypropylene thread scraps as a viable solution for wastewater treatment, contributing to waste reduction and improved environmental management. Graphical abstract

Modeling Deformation Properties of Composite Polypropylene Threads Filled with Carbon Nanofibers

Modeling Deformation Properties of Composite Polypropylene Threads Filled with Carbon Nanofibers

Impact of Polypropylene Sutures Phisical Properties on Lymphaticovenous Anastomosis in Lymphedema Patients

Polypropylene is a material recognized for its tensile properties, as well as for the stability of its chemical structure, an important element that has allowed the use of this material on a large scale, in a wide range of fields of activity, especially in the medical field. This study aims to highlight the structural properties of polypropylene, which contribute to improving the prognosis of vascular microsutures, through the comparative analysis of the results obtained after performing lymphatico-venous anastomosis in lymphedema patients. The research was focused on analyzing the importance of the diameter of the polypropylene thread and its tensile properties on the patency of the lymphatic anastomosis, through the comparative analysis of two groups of patients who benefited from micro-vascular sutures. The database was made up of a group of 82 patients divided into two groups who benefited from supermicrosurgical interventions by using polypropylene thread 11.0 (37 cases involving 148 anastomoses), respectively 12.0 (45 cases involving 180 anastomoses). The results of the research revealed that the group of patients who benefited from microvascular anastomoses using 12.0 poly-propylene thread recorded both better anastomosis patency rates and a significantly reduced rate of complications due to the rejection reaction of the suture material, under the conditions a significantly reduced tensile strength.

Comparative experimental study of biomechanical features of suture materials in tendon repair

Introduction Many different suture configurations and pathomorphology of tendon repair have been described for tendon repair over the past 20 years. However, the biomechanical properties of suture material at primary flexor tendon repair have not been sufficiently explored. A cyclic loading test is performed to evaluate the performance of the different sutures under repeated loading conditions simulating dynamic conditions in postoperative rehabilitation procedures.The objective was to compare the strength of suture materials under cyclic loading on a biological model of a tendon.Material and methods Eighty porcine digital flexor tendons were examined in a pilot study. The sutured tendons were tested with a universal testing machine. Tendon repair was produced using polypropylene in group I, braided polyamide suture in group II, complex polytetrafluoroethylene thread in group III and a thread of superelastic titanium nickelide in group IV. The standard Chang protocol was used for cyclic loading.Results The percentage of intact sutures was 25 % in group I and in group II, 80 % in group III and 85 % in group IV after completing the entire load cycle. A pairwise comparison showed suture disruption being more common for group I and group II as compared to group III and group IV. Irreversible gap was more common for group 1 as compared to group IV. Neither knot ruptures nor tissue cutting were seen in the groups.Discussion The topic of biomechanical properties of suture material remains poorly understood. Although static load testing is commonly used in current experimental studies and cyclic testing is suitable for simulating postoperative conditions. The search continues for the “ideal” suture material for flexor tendon repair to prevent tears and retain tensile properties until the repair reaches strength.Conclusion The threads of polytetrafluoroethylene and nickelide-titanium showed the best biomechanical properties for tendon repair in the form of linear strength, good elasticity and low plasticity of the suture material. There were no significant differences between polypropylene and braided polyamide threads.

Thread-powered cell lysis and isotachophoresis: unlocking microbial DNA for diverse molecular applications.

Central to the domain of molecular biology resides the foundational process of DNA extraction and purification, a cornerstone underpinning a myriad of pivotal applications. In this research, we introduce a DNA extraction and purification technique leveraging polypropylene (PP) threads. The process commences with robust cell lysis achieved through the vigorous agitation of interwoven PP threads. The friction between the threads facilitates cell lysis especially those microbes having tough cell wall. For purification of DNA, thread-based isotachophoresis was employed which makes the whole process swift and cost-effective. Lysed cell-laden threads were submerged in a trailing electrolyte which separated DNA from other cellular contents. The process was performed with a tailored ITP device. An electric field directs DNA, cell debris, trailing electrolyte, and leading electrolyte toward the anode. Distinct ion migration resulted in DNA concentrating on the PP thread's anode-proximal region. The SYBR green dye is used to visualize DNA as a prominent green zone under blue light. The purified DNA exhibits high purity levels of 1.82 ± 0.1 (A260/A280), making it suitable for various applications aiming at nucleic acid detection.

Two-way adjustable double-knots intrascleral fixation and single sclerotomy looping technique: a novel minimal invasive adjustable intraocular lens fixation technique

BackgroundIOL fixation without capsular support presents challenges for surgeons. Although innovative techniques were developed to address subluxated IOLs, adjustable IOL fixation methods are seldom reported. We introduce a novel two-way adjustable double-knots intrascleral fixation combined with single sclerotomy looping technique for fixing intraocular lenses (IOL) or IOL-capsular bags.MethodsA bent 30-gauge needle threaded with 8 − 0 polypropylene was introduced into the eye. A gripping forceps assisted the haptic looping. Two overhand knots were made with 8 − 0 polypropylene thread. The knots were incarcerated into a scleral tunnel made by a 30-gauge needle, with two ends of the thread left at each side of the tunnel. The IOL was adjusted to the premium position with adequate tension by pulling either end of the threads. The study included 19 eyes with aphakia, subluxated IOL-capsular bags, or subluxated crystalline lenses. The mean followed up period was 18.9 ± 7.1 months with evaluations of uncorrected visual acuity (UCVA), intraocular pressure, slit-lamp examination, and swept-source optical coherence tomography of the anterior segment.ResultsUCVA increased from 1.28 ± 0.74 at baseline to 0.44 ± 0.51 (logMAR) at final visit (P < 0.001). All IOLs were fixed well-centered. The mean IOL tilt was 3.5°±1.1°. Postoperative complications included transient IOP elevation (15.8%), hypotony (10.5%), and cystoid edema (5.3%) which resolved within 4 weeks.ConclusionsWe presented a novel adjustable technique for IOL fixation, which stabilize IOLs by using an intrascleral double-knots structure. This technique minimized surgical manipulations by using a single sclerotomy looping technique without large conjunctival dissection and scleral flap creation. The technique offers a reliable and optimal IOL positioning and improved visual outcomes in patients undergoing scleral fixed IOL implantation.

Предварительные результаты превентивной фланцевой склерокорнеальной монофиксации комплекса внутрикапсульное кольцо – интраокулярная линза в хирургии катаракты при подвывихе хрусталика

Pathology of the ligamentous apparatus of the lens remains an urgent problem of ophthalmic surgery and is associated with possible intra- and postoperative complications. To prevent further dislocation of the intraocular lens (IOL) in the postoperative period, IOL suturing with polypropylene thread is used for one or both supporting elements to the iris, or with sclerocorneal or scleral fixation. Purpose. Development of preventive flanged sclerocorneal monofixation of the intracapsular ring – intraocular lens complex in cataract surgery with lens subluxation of II–III degree and evaluation of its effectiveness. Material and methods. Preventive flanged sclerocorneal monofixation of the intracapsular ring – intraocular lens complex in cataract surgery with lens subluxation of II–III degree was performed in 15 patients aged 74.4 ± 11.4 years. The lens was fixed by the edge of the capsulorexis with four iris retractors, an intracapsular ring of the SK-2 type (Reper, Russia) was implanted into the capsule bag, an 8/0 polypropylene monofilament was attached to the inner curl of which, the second end of the thread was ab interno transclerally-transcorneally with the formation of a flange, the IOL was implanted into the capsule bag. Results. In all cases, the capsule bag was preserved and intra-capsule implantation of the IOL was performed. Complications during operations and in the postoperative period were not received in any case. The maximum corrected visual acuity (MCVA) during treatment rose from 0.2 ± 0.15 to 0.85 ± 0.14 6 months after surgery (p &lt; 0.01; t-criterion). The loss of endothelial cells 3 months after surgery was 8,9 ± 1,4%. Conclusions. The use of preventive flanged sclerocorneal monofixation of the intracapsular ring – intraocular lens complex in cataract surgery with lens subluxation of II–III degree made it possible to preserve the capsular bag in all patients and perform the most physiological intracapsular implantation of IOL. Keywords: cataract, lens subluxation, phacoemulsification, intraocular lens.

Four-Point Refixation for In-the-Bag Intraocular Lens Dislocation Into Vitreous Cavity With Implantable Capsular Hooks.

Four-Point Refixation for In-the-Bag Intraocular Lens Dislocation Into Vitreous Cavity With Implantable Capsular Hooks.

The Healing Effect of Biodegradable Scaffolds Treated with Bone-Marrow Obtained Mesenchymal Stem Cells on Major Tendon Damage in the Dog as a Model.

The present study aimed to evaluate the implantation of decellularized small intestinal submucosa- extracellular matrix )SIS-ECM( seeded with bone marrow mesenchymal stem cells (BM-MSCs) to repair full-thickness Achilles tendon defect. For this purpose, 20 healthy adult stray dogs aged 8-12 months old (15±3 kg of weight) were enrolled in this study under an aseptic environment and general anesthesia. A 1.5 cm-long segment-based resection was performed in the mid-substance of the Achilles tendon in the control group (n=10) that did not receive treatment. While, in the experimental group (n=10), regarding the defect of the tendon, the stumps were bridged with decellularized SIS seeded with BM-MSCs (5×106) cells implanted. Afterward, the stumps of the tendon were sutured using the modified Kessler technique (4-0) polypropylene thread. The biomechanical observations of the tendon defect showed an increase in the tensile strength in the experimental group, compared to the control animals. It should be mentioned that this difference was significant (P≤0.05). Histopathological observations of biopsies harvested after the 4th, 8th, and 12th weeks revealed that the implanted graft had seeded with MSCs enhanced high-quality cellular infiltration and the host tissue healing was improved. Similar to the normal tendon, a dense organized collagenous tissue with high cellularity and vascularity was observed due to the presence of the remodeled ECM. However, the arrangement of collagen-fiber-derived connective tissue appeared to be more dominant than that in the experimental group, with less adhesion in the 12th week post-treatment. These findings suggest that the BM-MSCs inoculated with SIS can be employed to repair a damaged Achilles tendon due to the fact that this combination enhances the regeneration of the affected tendon.

Bipolar high-frequency electric welding in radical resection of frontal sinus tumors.

The aim of study is to develop a new method of connecting the dura mater (DM) defects in frontal sinus tumors with intracranial spread using high-frequency bipolar coagulation for welding of living tissues. Depending on the method of DM defect repair, patients were divided into two groups. The 1st group (control) included patients whose DM defect was connected according to the conventional method (suturing with polypropylene threads), in the 2nd group-the DM defect was connected by high-frequency bipolar electric welding using EKVZ-300, Patonmed. As a result of the study, the authors proposed an effective method of connecting the DM defects after the removal of frontal sinus tumors spreading intracranially. Such methods include a high-frequency bipolar electric welding method, the use of which contributed to a minimal destructive effect on adjacent tissues, but at the same time hermetically connected the DM. This was possible due to the supply of current with certain wave characteristics in a certain modulation at a temperature of 40-48°C, resulting in the connection of tissues without the formation of a coagulation scab due to the mechanism of protein-associated electrothermal adhesion of tissues. Presented data indicate significant advantages of using high-frequency bipolar electric welding the DM defects and fascia lata to restore the closed physiological circuit of cerebrospinal fluid circulation, compared to the traditional suture method. This approach has reduced intra- and post-operative complications, the time of surgery, and the length of the postoperative period.

The Results of Using the Method of Bipolar High-frequency Electric Welding to Close Defects of the Dura Mater in Frontal Sinus Tumors with Intracranial Spread, and its Comparison with the Standard Method

The frequency of cerebrospinal fluid leak (CSFL) in the postoperative period after surgical interventions on the structures of the skull base reaches 6.2%, and after interventions on the structures of the anterior cranial fossa - 5.9%, middle cranial fossa - 6.4% and - 5.8% in all subtentorial interventions (Jamshidi, 2022; Rajendran, 2020). The aim of the study is to increase the effectiveness of surgical treatment of patients with tumors of the frontal sinuses with intracranial spread by using the method of high-frequency bipolar electric welding. Depending on the method of dura mater defect repair, patients were divided into 2 groups. The 1st group (control) included patients whose dura mater defect was connected according to the conventional method (suturing with polypropylene threads). In the 2nd group – the dura mater defect was connected by high-frequency bipolar electric welding. Patients of the 1st and 2nd groups were divided into 2 subgroups. Subgroups 1A and 2A included patients in whom the DM defect was up to 3 cm in diameter and linear; if necessary, a pericranium was used to close the DM defect. Subgroups 1B and 2B included patients in whom the connection of the defect was performed with the help of a fascia lata. As a result of the study, the authors proposed an effective method of connecting the dura mater defects after the removal of frontal sinus tumors spreading intracranially. Such methods include a high-frequency bipolar electric welding method, the use of which contributed to a minimal destructive effect on adjacent tissues but at the same time hermetically connected the dura mater. Presented data indicate that the use of high-frequency bipolar electric welding allowed to reduce the frequency of external CSFL by 2.2 times, compared to the use of suture material, and to reduce of hidden CSFL by 4.6 times, which indicates a statistically significant advantage of using high-frequency bipolar electric welding to close DM defects and prevent the occurrence of external and hidden CSFL in the postoperative period. In the presence of a DM defect of more than 3 cm and when it is closed with the fascia lata, it is possible to reduce the occurrence of external CSFL by 2.0 times compared to the control group. The use of high-frequency bipolar electric welding almost completely reduces the possibility of the formation of a meningeal scar in the postoperative period, which significantly accelerates the recovery of CSFL circulation and the recovery of brain tissue (due to the absence of factors that would irritate it), as a result of which the patient's rehabilitation and recovery are faster, compared to standard methods of connecting DM. The use of high-frequency bipolar electric welding was manifested by a faster recovery of normal intracranial pressure indicators - a faster recovery of fluid dynamics, a faster regression of inflammatory changes in the brain tissue and, as a result, a faster recovery of its functions, which indicates a higher quality of life of postoperative patients in the main group, compared to the control group.

Экспериментальное исследование применения биодеградируемых нитей с поли-L-молочной кислотой и перманентных (полипропиленовых) нитей в косметической хирургии наружных половых органов

Экспериментальное исследование применения биодеградируемых нитей с поли-L-молочной кислотой и перманентных (полипропиленовых) нитей в косметической хирургии наружных половых органов

Demonstration of Use of a Novel 3D Printed Simulator for Mitral Valve Transcatheter Edge-to-Edge Repair (TEER).

Mitral regurgitation is a common valvular disorder. Transcatheter edge-to-edge repair (TEER) is a minimally invasive technique which involves holding together the middle segments of the mitral valve leaflets, thereby reducing regurgitation. To date, MitraClip™ is the only Food and Drug Administration (FDA)-approved device for TEER. The MitraClip procedure is technically challenging, characterised by a steep learning curve. Training is generally performed on simplified models, which do not emphasise anatomical features, realistic materials, or procedural scenarios. The aim of this study is to propose a novel, 3D printed simulator, with a major focus on reproducing the anatomy and plasticity of all areas of the heart involved and specifically the ones of the mitral valve apparatus. A three-dimensional digital model of a heart was generated by segmenting computed tomography (CT). The model was subsequently modified for: (i) adding anatomical features not fully visible with CT; (ii) adapting the model to interact with the MitraClip procedural equipment; and (iii) ensuring modularity of the system. The model was manufactured with a Polyjet technology printer, with a differentiated material assignment among its portions. Polypropylene threads were stitched to replicate chordae tendineae. The proposed system was successfully tested with MitraClip equipment. The simulator was assessed to be feasible to practice in a realistic fashion, different procedural aspects including access, navigation, catheter steering, and leaflets grasping. In addition, the model was found to be compatible with clinical procedural imaging fluoroscopy equipment. Future studies will assess the effect of the proposed training system on improving TEER training.

The Effectiveness of Intradermal Suture Technique on Hypertrophic Scar Prevention in Rats

Introduction : Hypertrophic scarring is a complication that occurs in post-surgical wounds. There are many ways to prevent scarring, but there have been no satisfactory methods yet. Moreover, no studies investigated the effectiveness of intradermal sutures. Polypropylene thread can be used to repair a scar after surgery. This study aimed to prove the effectiveness of intradermal sutures using polypropylene thread on surgical scar quality.Method : The study was conducted using a randomized, controlled trial, and post-test only with 20 rats (Rattus norvegicus) as animal subjects. The wounds were made on the back, approximately 6 mm x 2 cm. Then, the rats were divided into two groups: a control group without intradermal sutures (K) and treatment group with intradermal sutures (I). Histopathological examination using Hematoxylin and Eosin (H&amp;E) staining was used to identify the fibroblast number on the 21st day. The fibrocytes number were also observed on the 12th week and the Vancouver Scar Scale (VSS) was used to assess the scar quality.Result : The number of fibroblasts and fibrocytes in the control group (K) was significantly smaller (53.60 ± 14.571; 3.20 ± 0.447) than the treatment (I) (243.20 ± 75.334; 171.40 ± 13.221). The VSS value was significantly greater in the control than the treatment.Conclusion: The intradermal sutures using polypropylene thread produced a better-quality scar after surgery compared to wounds without intradermal sutures.

THE USE OF SURGICAL ADHESIVE AND SUTURE FIXING MESHES TO THE ABDOMINAL WALL: AN EXPERIMENTAL STUDY IN RATS.

ABSTRACT - BACKGROUND:Proper fixation of the surgical mesh determines the success of a herniorrhaphy. Understanding the inflammatory response and the mechanical properties of the mesh helps to define whether a fixation method is superior.AIM: This study aimed to evaluate the healing of defects in the abdominal wall of rats, comparing the repair of macroporous polypropylene meshes fixed with surgical glue and polypropylene thread.METHODS: In 20 Wistar rats, a defect was produced in the abdominal wall, with the integrity of the parietal peritoneum. For correction, the meshes were fixed with surgical glue (2-octyl cyanoacrylate) (subgroup C1), or polypropylene suture (subgroup C2). The two subgroups of 10 animals were euthanized on the 90th postoperative day, and the fragments of the abdominal wall were submitted to macroscopic, histological, and tensiometric analysis.RESULTS: Macroscopic analysis did not show any abnormalities. Tensiometry on the 90th postoperative day in subgroup C1 showed mean rupture tension of 28.47N and in subgroup C2 32.06N (p=0.773). The inflammatory process score revealed that both groups are in the subacute phase (p=0.380).CONCLUSION: The fixation of a polypropylene macroporous mesh to repair an abdominal wall defect can be performed with surgical glue (2-octyl cyanoacrylate) or polypropylene suture, both methods being equally effective.

Physical Analysis of the Creep of Polypropylene and Polyvinylidene Fluoride Threads for Medical Purposes

Physical Analysis of the Creep of Polypropylene and Polyvinylidene Fluoride Threads for Medical Purposes

HIGH-RESOLUTION ULTRASOUND OF COSMETIC THREADS AFTER THEIR IMPLANTATION INTO THE SOFT TISSUES OF THE FACE AND NECK

Objective To optimize the process of diagnostics of cosmetic threads using the high-resolution ultrasound. Material and Methods 80 women were examined with high-resolution ultrasound after implantation of cosmetic threads made of absorbable and non-absorbable materials into the soft tissues of the face and neck. Threads based on the L-lactide-co-ԑ-caprolactone were implanted in 36 cases (45%), threads produced from silicone-sheathed polyester fiber were used for 7 (8.8%) patients, from polydioxanone for 17 (21.2%) patients, from L-lactic acid for 14 (17.5%) patients, polypropylene threads were implanted in 5 (6.3%) patients, gold threads were applied only in one case (1.2%). Patients complained of overcorrection in 10 cases, inflammatory complications in 10 cases as well, and inquired about the presence of the threads in soft tissues in 60 cases. Results Ultrasound feature of non-absorbable threads made of silicone-sheathed polyester fiber is a heterogeneous structure with a hypoechoic center and hyperechoic margins. Inflammation around the threads is accompanied by perifocal edema in the form of a zone of reduced echogenicity. The presence of an acoustic shadow is a differential feature that distinguishes threads from the ligamentous apparatus of the skin. Effect of reverberation is a specific feature for metal threads. Conclusion If threads are found in the implantation area, it is necessary to carry out differential diagnostics of the ligamentous apparatus, septa, and superficial fascia of the face. The methodological features lied in the fact that ultrasound diagnostics should be performed in multiple views with necessary visualization in the transverse and longitudinal sections of the studied object using the high-frequency sensors in B-mode, as well as the Doppler technology and compression elastography.

Intraocular Suture Looping Technique for Flapless Four-Point Refixation of Dislocated Intraocular Lenses.

Purpose To describe a flapless/grooveless technique for four-point refixation of a dislocated intraocular lens (IOL) with four fenestrated haptics. Methods An intraocular suture looping technique was performed with the assistance of two 27-gauge needles. A looping needle was passed into the eye through paracentesis and was used to loop both fenestrated haptics on the same side with an 8–0 polypropylene thread. A guiding needle was used to guide the looping needle out of the eye at the scleral fixation sites. After looping each pair of fenestrated haptics on nasal/temporal sides with 8–0 polypropylene sutures, the IOL was refixated by definitive knotting. The exterior suture ends were buried into the sclera without the creation of scleral flaps/grooves. Results The technique was employed in four eyes (three patients). The mean postoperative follow-up period was 13.8 ± 2.2 months. Postoperatively, the IOLs of all the eyes remained well positioned and stable. The postoperative visual acuities of all the eyes were improved. No suture erosion, hypotony, scleral atrophy, chronic inflammation, retinal tears, and/or detachments were observed within the follow-up period. Conclusion The present technique provides minimal surgical invasion for the transscleral refixation of a dislocated IOL with four fenestrated haptics.

The effect of air relative humidity on the evaporation temperature of water-ethanol droplets

Using the method of infrared thermography, an experimental study of the temperature of evaporating droplets of a water-ethanol solution of different concentrations suspended on polypropylene thread at different air relative humidity was carried out. It is shown that the amplitude of the diminution in droplet temperature during evaporation decreases with an increase in relative air humidity for all considered concentrations of the water-ethanol solution. It is shown that the pattern of decreasing the minimum temperature of cooling of the evaporating droplets with increasing ethanol concentration is characteristic of all the studied air relative humidity. The obtained experimental data are generalized and can be used when calculating the heat and mass transfer of evaporating droplets of the water-ethanol solution.