Bullet resistant refers to the ability of a product being able to prevent a bullet from passing through it, protecting objects or people who may be behind.
Architectural Armour offer bullet-resistant constructions made of glass and polycarbonates.  There are two types of products that offer this protection; Spall Allowed and No Spall.

Spall Allowed (SA or S): This is an all glass construction, made up of multiple layers of glass and interlayer (this may be a Polyvinyl Butyral or Resin), laminated together to offer protection against a range of firearms e.g. BR4/SA will offer protection against a 0.44 Handgun.  ‘Spall’ refers to glass shards separating from the rear of the construction.  When a bullet connects with the glass the force of the impact is absorbed to some degree however shards of glass will break away from the panel.

To prevent this you have the option of No Spall.

No Spall (NS): This may be an all glass construction and are often extremely thick, e.g. a glass/polycarbonate construction.  Multiple layers of glass are laminated with the final layer being a polycarbonate sheet.  When a bullet hits the panel of glass the impact is fully absorbed preventing shards of glass breaking away and fully protecting the object or individual standing behind it.

No Spall constructions have the advantage of being lighter than an all glass construction and are thinner e.g. BR4/SA can be 32mm thick weighing 75kg/m2 whereas the equivalent NS construction is 26mm with a weight of 55kg/m2.

Both of these products are manufactured in the same way, go through the same processes, the only difference occurs with the polycarbonate.

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