PSDB Body Armour Standards for UK Police (2003). PSDB is a standard for Ballistic Resistance and Knife and Spike Resistance of UK Police Body Armour developed by the Home Office Police Scientific Development Branch (2003). Ultra-high-molecular-weight polyethylene (UHMWPE or sometimes shortened to UHMW), also known as high-modulus polyethylene (HMPE) or high-performance polyethylene (HPPE), is a subset of the thermoplastic polyethylene. It has extremely long chains, with molecular weight numbering in the millions, usually between 2 and 6 million. The longer chain serves to transfer load more effectively to the polymer backbone by strengthening intermolecular interactions.
This results in a very tough material, with the highest impact strength of any thermoplastic presently made.  It is highly resistant to corrosive chemicals, with exception of oxidizing acids. It has extremely low moisture absorption, has a very low coefficient of friction, is self-lubricating, and is highly resistant to abrasion (in some forms, 15 times more resistant to abrasion than carbon steel). Its coefficient of friction is significantly lower than that of nylon and acetal, and is comparable to that of polytetrafluoroethylene, but UHMWPE has better abrasion resistance than PTFE.
It is odorless, tasteless, and nontoxic. Polymerisation of UHMWPE was commercialised in the 1950s by Ruhrchemie AG, which changed names over the years; today UHMWPE powder materials are produced by Ticona, Braskem, and Mitsui.
UHMWPE is available commercially either as consolidated forms, such as sheets or rods, and as fibers. UHMWPE powder may also be directly molded into the final shape of a product. Because of its resistance to wear and impact, UHMWPE continues to find increasing industrial applications, including the automotive and bottling sectors, for example. Since the 1960s, UHMWPE has also been the material of choice for total joint arthroplasty in orthopedic and spine implants. UHMWPE fibers, commercialised in the late 1970s by the Dutch chemicals company DSM, are widely used in ballistic protection, defense applications, and increasingly in medical devices as well. If you find any quality problems when you receive your item/s.
We will resolve it for you in 48 hours. After receiving the feedback, we will do the same for you. Thank you for selecting us, and please come again!The item "PE Ballistic Bullet Proof Face Mask Body Armor NIJ level IIIA 3A Hot" is in sale since Friday, August 7, 2020. This item is in the category "Sporting Goods\Hunting\Tactical & Duty Gear\Body Armor & Plates". The seller is "pzd-45" and is located in CHINA. This item can be shipped to North, South, or Latin America, all countries in Europe, Australia.