UHMW-PE with low coefficient of friction, electrical conductivity and silicone free. The coefficient of friction between UHMW to UHMW/Steel surface is considered 0. Coefficient of friction, ASTM 1894 metal= Rz 2,5 V, Pm= 2 N/mm2 V= 150 mm/min Shore-hardness, 3-s-value 6mm ate Water absorption Flammability Method ASTM 0792 ISO 1183-1Fig. coefficient of friction, making it an excellent protection for surfaces or bearings that experience heavy wear. 15-. 77 4 Wet Rubber 38. 6m/s 0. This product is FDA and USDA compliant for food contact. 020 in. Download : Download full-size image; Fig. 15-. Learn more at Curbell Plastics. UHMW is an odorless, tasteless, and non-toxic material. UHMW Features. 45 – 0. A thin layer of Ultra High Molecular Weight Polyethylene (UHMWPE) or UHMWPE + PFPE is coated onto cylindrical aluminium (Al) pin (4. Low Coefficient of Friction Reprocessed UHMW is used in applications where high levels of friction are likely to arise including conveyor guard rails, augers and wear strips, belt scrapers, chain guides, and idler. UHMW is known for its excellent abrasion resistance and low coefficient of friction. 20 static, . It is also very resistant to moisture, most chemicals, UV radiation, and micro-organisms. The coefficient of friction of UHMWPE primarily depends on surface texture of harder material surfaces. The relationship between initial coefficient of friction, μ i and surface energy (or attractive force) for ultra-high molecular weight polyethylene (UHMWPE) film is modeled and experimentally measured at low normal loads (15–75. 0: in/in/°F x 10-5: Melting Point (Crystaline Peak) 279-289 °F: Volume Resistivity >10 15: ohm-cm: Surface Resistivity >10 15: ohm-cm: Water. Test prove that NanoSlick Lubricants are able to achieve an amazing 0. 12-0. 1 to 0. Aluminum: 1. It is also observed that UHMWPE-1 and UHMWPE-2 specimens corresponding to 280 °C has minimum. The silicone free requirement is of the negative effect that silicone. 1. The coefficient of friction of aged UHMWPE specimens for different aging periods is shown in Figure 4. UHMW-PE based products offer a host of exceptional attributes that include high abrasion resistance, low coefficient of friction and one of the highest impact strength ratings of any thermoplastic. They have values of friction coefficient for HDPE and UHMWPE . It can also be customized according to your requirements. Combined with the experimental results with a load of 50 N, higher or lower loads will adversely affect the friction reduction effect of UHMWPE-g-AA. Buy Uhmw Coefficient Of Friction China Direct From Uhmw Coefficient Of Friction Factories at Alibaba. Outrigger pads can prevent cranes and boom trucks from. Introduction. And UHMW. 14 : Sand Wheel Wear/Abrasion Test: 95: UHMW=100: Coefficient of Linear Thermal Expansion: 11. . 6 and a dynamic coefficient range of 0. However, contact zone was obviously different with a friction coefficient ratio of 1 comparing to that with a friction of coefficient ratio of 1. 2 LOCKED-WHEEL BRAKING TESTS Coefficients of friction were determined from the VericomTM VC2000 data for each upgradeBy increasing load from 50 to 150 N, i. 1-0. Nylon, Acetal - for bearing and wear applications. Select options; Tivar® H. The coefficient of friction (COF) was increased up to 65. It has extremely low moisture absorption and a very low coefficient of friction. 01 µm, disk = 0. sliding (slip between surfaces) where μ s is the coefficient of static friction and μ k is the coefficient of kinetic friction. These attributes make them ideal for tough impact wear or. 14. 0 - 4. ULF material is a specifically formulated UHMWPE (Ultra High Molecular Weight Polyethylene) with a self lubricating additive package to ensure consistent low-friction. 43. Spray-coated GNP shows the lowest friction, 40% less than UHMWPE, although with low adhesion. The coefficient of friction of aged UHMWPE specimens for different aging periods is shown in Figure 4. PTFE is significantly more expensive than UHMW. UHMW is typically stocked in 48″ x 120″ sheets where PTFE comes in 48″ x 48″ plates. The friction of non-filled UHMWPE on PEEK reinforced with two types of carbon fibers (milled carbon fibers, 30 wt % and CNT, 2. UHMW: Cost. 05. HDPE vs. 5 MPa • UHMWPE sterilized – Irradiated at 2. UHMW Reprocessed is also self-lubricating with an extremely low coefficient of friction. • Lasts longer than Virgin UHMW • Reduced chain wear • CUSTOM channel profiles available • Channel. Suggested for: Searching for Rolling Friction Coefficient for UHMW Polymer Rollers I Coefficient of rolling friction for a lab cart. Industrial Belting on UHMW-PE . In 25% serum, the coefficient of friction was 0. The initial friction coefficient of UHMWPE/Al 2 O 3 friction pair in dry friction, saline and distilled water lubrication conditions is higher and quite identical, and in plasma lubrication condition, the initial friction coefficient is the lowest. A subset of the thermoplastic polyethylene, UHMW (aka UHMWPE) is characterized as one of the miracle polymers of the 20th century. 2 and 3. Environment and disposal technology. 2 0. 115 respectively. Thanks. 8 g. ShapesPlastics UHMW Sheet is moisture, odor, stain & abrasion resistant. PTFE can only handle about 1/5th the load of UHMW. 75 Average 37. UHMW is an odorless, tasteless, and non-toxic material. Therefore, the friction coefficient of porous UHMWPE was about 0. After the steady state of friction, the friction coefficient in dry sliding is the highest, that. It's the reason that the data found in the many reference tables available may show a large. Price Add to Cart; Item 45714. UHMW-PE with low coefficient of friction and electrical conductivity. The coefficient of friction (COF) was increased up to 65. 22 . In the testing duration, the coefficients of UHMWPE samples corresponding to molding pressure of 15. • Make sure that the pieces of wood have surfaces that are similar in roughness and are about the same length and width. 1-800-553-0335 Ask a Plastics Expert Locations Sign In Cart (0) There are so many differences between products that they are best described in the list. UHMW also replaces metal in many applications. The materials in contact are a roller of MDF turning on a UHMW vertical bar. 38, 0. • Cavities act more like surface defects than lubrication enhancers. UHMW Mechanical Properties Comparison of dynamic coefficient of friction on polished steel PROPERTYThere are a few standout tests that have lower friction coefficients and seem to increase with pressure (the off-axis cases involving a short 45°- bottom uncoated strip on a 45° or. The dry friction from solid ice-UHMWPE interactions is still relatively low when compared to systems such as stainless steel-UHMWPE (Yousif et al. 12Acetal plastic has a low coefficient of friction, high strength and excellent wear properties. 4 mass% proteins to the phosphate buffered saline (PBS) solution used asThe steady values of coefficients of friction of this UHMWPE sample against Si 3 N 4 ceramic ball reach to. The variation of friction coefficient and wear loss with test time for UHMWPE composites under dry sliding and water sliding is shown in Figure 2. 5. 11, and it has good self-lubrication. % UHMWPE in polyester resin brought down the value of μ to nearly half to that of polyester resin and 1/3rd of cotton polyester. N = normal force exerted on the body by the plane due to the force of gravity i. UHMW PE is processed by compression molding or ram extrusion into sheets, plates or rods. The critical difference between UHMW and HDPE is that UHMW is characterized by long polymer chains with extremely high molecular weights. The uhmw u channel stock guide rail has strong abrasion resistance, and its abrasion resistance is 5 times that of nylon 66 and 7 times that of carbon steel. Despite the success of this restorative procedure, UHMWPE have only a finite lifetime. Compare plastic materials: Select two or more materials and then click "Compare. Property: UHMW: Nylon 6: Nylon. In this work, values for the coefficient of friction of a polyamide (nylon 6,6)/polymethyl methacrylate (PMMA. 87 and 0. Thanks for the link. 12: Bronze: Steel . Comparison of Dynamic Coefficient of Friction on Polished Steel. This product maintains all of the performance properties of the standard low coefficient of friction material. The coefficient of friction is an important tribological property of polymer materials. 5 – 0. UHMW-PE has a coefficient of friction of 0. Coefficient of friction Compression set after 24 hr at 175C % Compressive modulus GPa Compressive strength MPa Elongation at break % Hardness - Rockwell -1 Izod impact strengt h J m-1 Poisson's ratio Tear strength N mm Tensile modulus GPa Tensile strength MPa Polypropylene PP 13-16 0. 19, as the samples exposure from 21 s to 4 min. 5 wt. The significant reduction in wear rate of UHMWPE modified polyester-cotton composite has been discussed with the help of SEM observations of worn surfaces and coefficient of friction. Polystone ® M is a highly versatile polymer that can be designed and formulated to meet your industrial needs. Properties of UHMW. Thermal properties . It is inert meaning that it doesn't react to many chemicals. Though the friction coefficients of the materials are well distinct, all polymers exhibit a similar behavior, with a change in the friction force less than proportional to the applied load, resulting in a decrease of the coefficient of friction as pressure increases. Static and dynamic coecients of friction are signicantly lower than steel and most plastic materials (Table 1). Friction coefficients in dry sliding as a function of wear track position for one cycle of the chirp, double Fermat's spiral, and the Archimedes spiral. The decrease in the friction coefficient is associated with an increase in the mechanical properties of UHMWPE because of the thermal orientation hardening process, which increases the rigidity of the material and reduces the deformation component of the friction coefficient (reducing the penetration of the counter-body into the surface of the. 25, which is higher than the coefficient of friction of PTFE (0. 1 under oil lubrication. While not better than PTFE’s famously low friction, it’s far better than any elastomer or urethane seal material and lower than most comparable plastics such as Nylon or Acetal. People often mistake the coefficient of friction μ for the frictional force F f . 25 Wear Resistance Sand Slurry - 130 . 12 to 0. Please ask your Curbell Plastics representative for more specific information about. 1. While polytetrafluoroethylene (PTFE, Teflon) is normally regarded as having a lower coefficient of friction versus UHMW, IPX UHMW has a comparable coefficient at . Suitable for machining and fabrication. 23 and that of kinetic friction (CSF) increased from 0. If the pulley has a radius R and a moment of inertia I0 about an axis through the center of the pulley , the net torque on the pulley is given by T 2 R ! T 1 R " !I0 /R "a , !3" where we have ignored any frictional. 0 m/s, contact pressures from 1. X-LINKED or CROSS-LINKED UHMW is 60% better than VIRGIN UHMW in sand slurry abrasion tests, has a lower coefficient of friction and UV stabilization for outdoor use. UHMW’s coefficient of friction is also quite low. In 25% serum, the coefficient of friction was. More economical that PTFE tapes. Reprocessed UHMW-PE offers all the same benefits of standard UHMW-PE sheets but at a much more cost-effective price. 8 1 PA 6/6 PA ‐ 6 POM H. Product Information. A subset of the thermoplastic polyethylene, UHMW (aka UHMWPE) is characterized as one of the miracle polymers of the 20th century. The coefficient of friction when large R-roller. 5 Scanning Electron Microscopy (SEM) 5. 13, 0. The friction coefficients of UHMWPE/PMF-2. Chui and his Co-workers coated PPy on UHMWPE fiber to enhance its adhesion with an epoxy resin [58], [59]. Low friction. (SCF) improved the wear resistance and also reduced the coefficient of friction up to an optimum concentration of 20 vol. Most popular is FQ1000-DS which is 'double-sintered' and work-hardened. Dec 14, 2021; Replies 8 Views 2K. 060 represents, in our experience, skis with below average gliding properties and would therefore have potential for improvements. Once the object moves, there is kinetic friction. It drastically reduces the coefficients of friction while maintaining characteristics of UHMW. . The superior sliding performance of TIVARResulting values of COF (coefficient of friction) for UHMWPE vs. The reason is the large d ifference between the coefficient of thermal expansion of. 0 /5 · 0 reviews ·TapeCase UHMW Polyolefin Film Tape 2302-10, is a natural colored 11. There is a need for UHMW-PE with low friction properties and electrical conductivity in the automobile production industry. Ultra-high molecular weight polyethylene All existing data on UHMWPE indicate that for (UHMWPE) is a unique polymer with outstanding very elderly patients,. 21 0. Impact strength is high and chemical resistance is excellent. A value of 100 was designed for the amount of volumetric abrasion loss to UHMW specimen. PEEK composites are filled. 0 wt% were 0. Search Search. GAR-DUR® UHMW plasticwasassignedan abrasionratingof10; results for the other materials tested are shown in relation to thisbaseline. Dynamic friction coefficient (COF) of the reciprocating sliding contact of the conventional UHMWPE, was investigated in four different environments (dry contact; distilled water; pure Ringer's solution and with PMMA particles), at five values of low normal load (0. UHMW-PE molding and extrusion materials: FDA: Natural: Polystone® M (UHMW-PE) Is in compliance with FDA regulations as listed in the Federal. UHMW’s host of exceptional attributes such as high abrasion resistance, low coefficient of friction and unparalleled impact resistance, even in cryogenic environments, make it a favorite among. 20 IZOD impact strength 73°F KJ/m. The right polymeric compounds can thwart wear and friction problems in bearings, bushings, slides, and gears. 3 (uncoated PEEK) to 0. UHMW PE, Unfilled. HC-PE showed a slightly lower coefficient of friction than LC-PE. Ultra-High Molecular Weight Polyethylene (UHMWPE) is used in biomedical applications due to its high wear-resistance, ductility, and biocompatibility. 1. 18 observed a positive correlation between the surface roughness of the ceramic counterface and the coefficient of friction. They have values of friction coefficient for HDPE and UHMWPE . Dynamic friction coefficient curves exhibited HDPE vs UHMW Friction. 302. Product Information. Friction coefficient was mostly influenced by axial load; its increase led to a decrease in friction. PTFE is substantially much more expensive than UHMW. The right polymeric compounds can thwart wear and friction problems in bearings, bushings, slides, and gears. 13 to ∼0. 28 0. 2, while rubbing with sample no. UHMW is commonly manufactured in Natural (FDA approved), black, and repro black. UHMW is chemically inert, absorbs virtually no moisture, and can be machined very easily. The very low coefficient of friction provides a lubricated surface that is virtually maintenance free. Low coefficient of friction; Corrosion, abrasion, wear and impact resistant;. f s ≤ μ s N, 5. 4 0. 56-Rubber (60 A Belt) Urethane 50 . • Entrainment speed and slip to rolling ratio have direct effect on friction coefficient. Low coefficient of friction Moisture resistance applications Tanks and containers Food storage containers Laboratory equipment Disposable formed products Surface structures Vacuum formed end caps and tops Moisture barrier TYPICAL PROPERTIES of POLYETHYLENE ASTM or UL test Property LDPE HDPE UHMW PHYSICAL D792. 200,. The chain's coefficient of friction differs by type of chain, by material, and by type of roller; it is shown in the manufacturer's catalog. (POM) as sliding partner up to 75% less than that of UHMW-PE; Coefficient of friction with Steel as sliding partner up to 60% less than that of UHMW-PE; Suitable. UHMWPE pipes have reduced coefficient of friction, improved abrasion resistance, lower wear rates over conventional HDPE pipes such as PE100. 0 MPa m/s for the friction pairs UHMWPE–18Kh2N4MA steel and UHMWPE–45 steel, a rather sharp increase in the friction coefficient to 0. Regards, Peter P . Among polymeric materials, ultrahigh molecular weight polyethylene (UHMWPE) is considered the best choice for medical and light-weight engineering applications in the construction and automotive industries, since it exhibits a unique toughness, abrasion, fatigue, and good chemical resistances, in addition to a very. PTFE is more slippery than UHMW (despite both having a low coefficient of friction) UHMW has far better wear properties than PTFE. The coefficient of friction and wear of the UHMWPE pins were determined by means of a pin-on-disc tribometer under lubricated sliding conditions. The weight loss of CNT-reinforced UHMWP was found to decrease with the increasing amount of. In addition to enhancing the wear resistance of the material, the incorporated and evenly dispersed oil gives this material a considerably lower coefficient of friction than standard UHMW-PE products. UHMW Chain Guide Rail is the most abrasion resistance, zero friction precision machined belt guides, magnetic corner tracks, chain guides profiles, wear strip, trailing guides and curve tracks. TIVAR® DrySlide is a UHMW-PE product with an internal lubricant built into the polymer matrix with higher molecular weight. 10-. 07, 0. It has all of the properties of high-density polyethylene (HDPE), the ability to withstand intense acids and alkalis, and a variety of organic solvents. conductivity of the UHMW PE assuming similar. Even though the UHMWPE reveals a low friction against CoCrMo or Ti6Al4V, wear of UHMWPE is unavoidable as shown in the. Conveyor guides; Wear pads; Contact a Dielectric Manufacturing knowledge expert to discuss the use of UHMW polyethylene for fabrication of your plastic parts. The possible reason was that the PMF was distributed on the surfaces of the composites. 1-0. • Take one piece of wood and soak it in water—this can. 28 0. 7 MPa) so you will need more material to carry the same load. 20 - 0. In addition, it is abrasion, impact, and corrosion resistant and is self-lubricating. This advanced product uses oil filled polymers to lubricate mating surfaces with a dynamic coefficient of friction formula of less than 0. 3 : The Reproducibility of. UHMW Polyethylene Round Rod. UHMWPE. 05 N/mm2, v= 0. Keywords: UHMWPE, Dynamic friction coefficient, Reciprocating sliding. This machinable thermoplastic is well known for its extreme toughness, outstanding abrasion resistance, and extremely low coefficient of friction. The mean coefficient of friction of the UHMWPE-on-PEEK and UHMWPE-on-cobalt chrome bearing couples with respect to increasing protein concentration is shown in Fig. Generally, the UHMWPE panel set in front of the steel panel. 20 . 8a, b that the friction coefficient of pure UHMWPE sample gradually increased with the progress of test, while the friction coefficient of UHMWPE-15, AF-5 and MC-AF. 77 0. 14. 75 2 Wet Rubber 37. 03. Nolu-S has a better thermal conduc - tivity compared to standard UHMW. UHMW's low coefficient of friction enhances efficiency and productivity in automotive, railroad, medical, printing and packaging industries as well as for material handling and food processing applications. UHMW's low coefficient of friction enhances efficiency and productivity in automotive, railroad, medical, printing and packaging industries as well as for material handling and food processing applications. Vertical lines, loads corresponding to. It was specifically developed as. g. I am planning to align an abs part that has a pin into a guide slot made from another plastic. Evolution of the friction coefficient of the UHMWPE and UHMWPE-g-AA samples under seawater lubrication with a load of 50 N. In particular, experimental wear tests showed that friction coefficient in HoS couples decreases with the contact pressure [14] and in-vivo measurements by means of instrumented hip implants. 85. The standard method of deriving CoF values for thermoplastic materials is the ASTM D3702, which makes it possible to compare materials and predict their wear performance. 10b). 28 Coefficient of Friction, Plastics to Plastic Static 0. The low friction coefficient and high abrasion resistance of UHMW-PE provides an ultra smooth surface for the vessel to slide easily along the face of the fenders. will deliver for you. 02 kW dissipated in a 90° curve by an LF880 TAB 0 chain running dry at 197ft/min (60m/min) under 500N (112lbf. 0. 7 0. Delrin® AF DE588 – 20% PTFE fiber filled homopolymer acetal with outstanding friction and wear characteristics. The coefficient of friction (CoF) is a measurement of the resistance generated when sliding the surface of one material over another. 2014. When considering the use of UHMWPE in total-joint replacement, there are several advantages. 18 by adding only 0. The low coefficient of friction also gives UHMW excellent release properties, preventing buildups and bottlenecking on conveyor lines moving food products or other potentially-sticky substances. DuraSurf™ STS also helps reduce. UHMWPE liners. It is one of the most wear-resistant plastics, and has toughness and impact resistance even at low temperatures. Introduction. The coefficient of friction (CoF) is a measurement of the resistance generated when sliding the surface of one material over another. • Coefficient of friction depends inversely on the applied load along walking cycle. It is commonly employed in scenarios where its exceptional wear resistance and minimal coefficient of. Full Sheet: 48"x120" (. Applications include guide rails, wear plates, rollers, conveyor augers, bin and hopper lines, chutes, bearings, bushings, and gears. Testsamples arespunforatotalof7 hoursat1,750rpmina water-sandmixture. 100 - 0. Research Acetal material properties, uses and specs at Curbell Plastics, get a quote, or ask a plastics expert. Its coefficient of friction is significantly lower than nylon and acetal, and is comparable to PTFE, with superior abrasion resistance. 15 - . 44 Thermal Properties DSC Melting Point Homopolymer 320 - 329 °F 160 - 165 °C Copolymer 275 – 318 °F 135 – 159 °C Specific Heat (@ 23°C) 70 -80 J/°K/molTIVAR Oil-Filled UHMW-PE is an ultra high molecular weight polyethylene material that truly lives up to the self-lubricating description. Friction responses of the diamond scratch. The material has a low coefficient of friction, is biocompatible, and inexpensive to produce. Differences: There are so many differences between the products that a list is the best way to explain: PTFE is substantially much more expensive than UHMW. 32 to ∼0. Good non-adhesiveness, easy to clean the surface adhesion. The friction coefficient value changes not only with material but also with the position and. 5 3 4 3 4 X 4 3 8 3 Inch 8 Bar Bar Stock Channel Lot Polypropylene Sheet Rod Uhmw . The Food and Drug Administration has approved natural virgin UHMW for use in the food. Alternative Materials to HDPE and. The material is resistant to chemical corrosion and moisture absorption, and retains key physical properties to -200°C. [35]. From Fig. Wear coefficient of UHMWPE as function of pv for friction pairs with steels of different grades: 45 steel (⚪); 18X2H4MA steel. 20 dynamic and complies with FDA, USDA,. 6 g and 3. A system in which f k = μ k N is described as a system in which friction behaves simply. 7 MPa. TIVAR® HPV UHMW-PE stock shapes encompass a range of standard sizes in the following geometries: Rod, Extruded Profile, Plate. Its strength and ability to resist wear and tear can, in some cases, outperform. Therefore, the friction coefficient of porous UHMWPE was about 0. N = normal force between the surfaces (N, lb) Friction coefficient curve is of sinusoid shape, whereat the opposite directions are marked with + and - sign, denoting coefficient of friction in two different directions of sample moving. 40 . 80 0. 09-0. 05), UHMWPE is able to reach a somewhat respectable 0. Friction on an inclined plane. Therefore, it is certain that UHMWPE is a good engineering. Polymer; Thermoplastic; Polyethylene (PE); High Density (HDPE); UHMW PE (Ultra High Molecular Weight PE). 20 on steel Dynamic . Coefficient of Friction: 0. 10 - 0. Redco™. 30 Industrial Belting on Crome Plated Steel . UHMW Guide Rail. Redco™ UHMW is highly durable and available in a wide variety of formulations and grades. 4 MPa m/s and pv ≈ 1. The microstructural analysis on the laser microtextured CoCr alloy revealed a grain refinement of secondary phases with absence of typical carbides resulting in an increased nanohardness. TIVAR® 88 plastics are alloyed to enhanced performance properties and tailored for specific applications within the bulk material handling industry. 12: against self - dynamic: 40 psi/50fpm : 0. It could be seen that the friction coefficient of UHMWPE under dry sliding is about 0. Concrete (Dry) Rubber. The UHMWPE fender facing pad has the features of light, anti-impact, corrosion resistance, anti-ultraviolet ray, aging resistance, low friction, non-pollution. Thus, a 4 x 106 molecular weight resin contains approximately 285 x 103 carbonLopez et al. 0 m/s, contact. Ultra High Molecular Weight polyethylene (UHMW-PE) is an engineering thermoplastic with a molecular weight of greater than 3. 17 : Coefficient of Friction (Dry vs Steel) Dynamic. Download scientific diagram | Coefficients of friction of various UHMWPE materials. For different friction coefficient ratios of dual mobility hip implant, (1) contact pressure and contact area varied with applied loads. 40. T 1! %M 1 g " M 1 a , !1" M 2 g ! T 2" M 2 a , !2" where T 1 and T 2 are the string tensions, a is the acceleration of M 1 and M 2, and % is the COF . Some nylons can be a real bitch to machine and Nylatron can be a little brittle so be careful not to machine too aggressively in the wrong spots. Superior sliding performance and high limiting pressure velocity. 189, 0. Tivar ® HPV features the lowest Coefficient of Friction (COF) available for any UHMW grade, due in part to a specialized built-in dry lubricant formula. Even though GAR-DUR® UHMW is. UHMW machined parts for replacing metal parts - UHMW-PE has also proven to be a good replacement for metal parts such as large chutes, wear strips. 15-0. UHMW, also called UHMW-PE (Ultra High Molecular Weight Polyethylene), is a type of thermoplastic material that is lightweight, high-strength, and has a low coefficient of friction and superior abrasion resistance. It has extremely long chains resulting in a very tough material, with high impact strength. The coefficient of friction for different types of top chain and guide rails is shown in Table 2. This white paper introduces key concepts to consider when selecting plastic materials for friction and wear applications and introduces the science behind four distinct mechanisms of polymer wear including: Sliding wear. (UHMW-PE): Designed for performance. In general, harder polyurethanes have a lower COF, and softer polyurethanes have a higher COF. 0 to 5. UHMW’s host of exceptional attributes such as high abrasion resistance, low coefficient of friction and unparalleled impact resistance, even in cryogenic environments, make it a favorite. TIVAR® 88 has a lower coefficient.