Aramid and Polyethylene.
In order to ensure seamless protection and still preserve a lower weight, high quality and extremely carefully finished fibre mats are used for the armour plating of the BMW 5 Series Security. This material is the same as that used for bulletproof police vests. Not only is it bullet-resistant, it also resilient to heat, fire and acid. The protective mats in the areas of the doors are made of the even lighter and equally bullet-proof material polyethylene. This absorbs the impact energy of a projectile especially well due to its structure while chrome-nickel steel is used for bordering and sealing the gaps.
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