What kind of plastic? UHMW (Polyethylene) Redco™ Ultra High Molecular Weight Polyethylene (UHMWPE) has extremely low moisture absorption, a very low coefficient of friction, is self lubricating and is highly resistant to abrasion (10 times more resistant to abrasion than carbon steel). Figure 1: Static vs dynamic friction Friction coefficients of thermoplastics against steel. 1 0 obj (a) Oleic acid; (b) Atlantic spindle oil (light mineral); (c) castor oil; (d) lard oil; (e) Atlantic spindle oil plus 2 percent oleic acid; (f) medium mineral oil; (g) medium mineral oil plus ½ percent oleic acid; (h) stearic acid; (i) grease (zinc oxide base); (j) graphite; (k) turbine oil plus 1 percent graphite; (l) turbine oil plus 1 percent stearic acid; (m) turbine oil (medium mineral); (n) olive oil; (p) palmitic acid; (q) ricinoleic acid; (r) dry soap; (s) lard; (t) water; (u) rape oil; (v) 3-in-1 oil; (w) octyl alcohol; (x) triolein; (y) 1 percent lauric acid in paraffin oil. Rubber in contact with other surfaces can yield friction coefficients from 1 to 2. Values outside this range are rarer, but teflon, for example, can have a coefficient as low as 0.04. Friction coefficient table for various material pairs in atmosphere and vacuum (see the definition of friction coefficient) is shown below.The data was collected from various sources [1,2,3]. UHMW is an acronym for Ultra High Molecular Weight Polyethylene. Plastic film has very low friction due to which there are ample chances of slippage. Example - Friction Force The friction force of a 100 lb wooden crate pushed across a concrete floor with friction coefficient of 0.62 can be calculated as: Ff = 0.62 (100 lb) = 62 (lb) 1 lb = 0.4536 kg Example - Car Stopping Distance A car with mass 2000 kg drives with speed 100 km/h on a wet road with friction coefficient 0.2. Coefficients of friction between materials are best determined through testing. What kind of rubber? The value of μs is generally higher than the value of μk for a given combination of materials. F = μ s N. static, impending slip. Coefficient of Friction, Plastics to Steel Static 0.30 0.30 Dynamic 0.28 0.28 Coefficient of Friction, Plastics to Plastic Static 0.76 0.76 Dynamic 0.44 0.44 Thermal Properties DSC Melting Point Homopolymer 320 - 329 °F 160 - 165 °C Copolymer 275 – 318 °F 135 – 159 °C Specific Heat (@ 23°C) 70 … {��ǵX=|X����n������� �`��� Here is an excellent discussion on friction coefficients, plus a comprehensive table of friction coefficients.. PET-P: (Polyester) Food Contact Grade Polyethylene terephthalate polyester has the best dimensional stability of any plastic, as well as excellent wear resistance and a low coefficient of friction. The table below is from Barrett, "Fastener Design Manual," NASA Reference Publication 1228, 1990: The table below is from MIL-HDBK-60, "Threaded Fasteners - Tightening to Proper Tension," 1990: Affordable PDH credits for your PE license, Barrett, "Fastener Design Manual," NASA Reference Publication 1228, 1990, MIL-HDBK-60, "Threaded Fasteners - Tightening to Proper Tension," 1990. endobj Below are provided a small number of values showing approximate values of friction coefficients to be used for steel screw fastened connections. The coefficient of friction testing is done to determine the easiness with which two facades when placed in contact with each other are able to slide on one another. Due to its low coefficient of friction, PTFE (polytetrafluoroethylene) is often used for sliding applications. 4 0 obj Low coefficient of friction Near-zero moisture absorption. The friction coefficient of rubber will increase with sliding speed increasing, and then remain unchanged or decline. The three most commonly used … Image Source: Wiki 2 0 obj The versatility of polyethylene has made it a popular plastic for countless industrial applications that require durability, low friction, and chemical resistance. For steel and other materials, μ can decrease only when the material in a very high speed (100 m/s or above), but high speed has great effect on polymer materials. Mathematically, μ = F/N, where F is the frictional force and N is the normal force. Friction coefficient table of solid lubricants, metals, plastics and anti-friction materials. Much has been "�? Redco™ UHMW has the highest impact strength of any thermoplastic presently made and is highly resistant to corrosive chemicals, with an … The coefficient of friction between two materials in relative sliding may depend on contact pressure, surface roughness of the relative harder contact surface, temperature, sliding velocity and the type of lubricant whether the level of contamination. 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