This chapter contains basic information pertaining to. properties and identification of metal and heat-treating. procedures used for metals. For more specific information on. metal and heat-treating techniques, refer to TM 43-0106. METAL CLASSIFICATION. All metals may be classified as ferrous or nonferrous.
UHMW (Ultra High Molecular Weight Polyethylene) is an outstanding choice for relatively low cost abrasion, impact, and chemical resistance. UHMW provided by Interstate Plastics is also known by brand names including IPX, Polystone, Tecafine, Dyneema, TivarÂ®, Polysteel, GUR, Utec and Mipelon. Known for an extremely high molecular weight, UHMW features an unsurpassed combination of slickness, toughness and chemical resistance. UHMW's molecular weight ranges from 3.1 million to 100 million grams per mole, with an abrasion resistance that continues to improve as molecular weight increases.
MDPE (Medium Density Polyethylene) has a little less branching then the HDPE. It is less notch sensitive then HDPE and has better stress cracking resistance. UHMWPE (Ultra High Molecular Weight Polyethylene) has extremely long chains, with molecular weight numbering in the millions (usually between 2 to 6 million). In general, HDPE molecules have between 700 and 1,800 monomer units per molecule, whereas UHMWPE molecules tend to have 100,000 to 250,000 monomers each. The chains of UHMW align in the same direction.