Nextel is a woven ceramic fabric manufactured by 3M Corporation. It is one of the most widely used shielding materials. Its alumina-boria-silica fibers shock incoming projectiles and turn them into small, less threatening, debris fragments. Nextel comes in many different styles and weights.
Kevlar is also a popular spacecraft shielding material manufactured by Dupont Co. It is also widely used in bulletproof vests. Many spacecrafts shields use a combination of Nextel and Kevlar to mitigate against a complete range of incoming debris.
Aluminum is a widely used aerospace material. It is also used as the rearwall and bumper material in many shielding solutions. Though it is heavy, in comparison to Nextel and Kevlar, it does offer some beneficial shielding characteristics.
Beta cloth is widely used in multi-layer insulation which thermally protects spacecraft components. Beta cloth is also used because it offers protection against atomic oxygen degradation in space. For this reason, beta cloth is sometimes tested for its shielding characteristics as well.
Aluminum Mesh is sometimes used on top of the front bumper of a shield. It helps initially shock and break up the incoming projectile just before striking the bumper plate.
Aluminum honeycomb sandwich panels are often used spacecraft designs to provide light weight strength to the structure.
Steel mesh is used on top of the front bumper of a shield. It helps initially shock and break up the incoming projectile before it impacts the spacecraft.
Aluminum foam sandwich panels are alternative to honeycomb panels that provide improved protection from MMOD impacts.