Bullet Resistant (Ballistic)It is sad to think that we live in a time where we need to design entrance solutions for keeping our families and property safe, but we must continually innovate to overcome the threats that present themselves in daily life. Bullet resistant doors or ballistic doors and complete ballistic-rated entrance systems are an important part of this innovation. (We previously discussed in Part 1 the reason we don’t use the term “bulletproof door” when referring to these products.) What makes a product bullet resistant? There are several ratings that could describe the level of bullet resistance in a product. The most common are:
- UL 752
- National Institute of Justice (NIJ) 0108.01
- State Department SD-STD-02.01
- ASTM F-1233
- HP White Laboratories HPW-TP 0500.02
- European Standard DIN EN 1063
- British Standards Institution BS 5051
- Councils of Standards Australia/New Zealand AS/NZ 2343
Blast ResistantIn some cases, such as in government installations, there is a blast requirement for most if not all exterior entrance systems. There are a couple of different approaches to achieve a blast rating for a blast-rated door specification.
- Arena Testing- This is obviously the most fun. As you can imagine by the name, this testing occurs outside in a controlled area, by setting off explosives to achieve the desired load and duration. The entrance system is instrumented to record the forces felt during the explosion. The advantage of using an arena test is that you’re not limited to certain dimensions on the product you’re testing. The downside with this method is that it is more difficult to obtain a specific pressure and duration due to the variation in explosive behavior.
- Shock Tube- The shock tube is an instrument used to replicate and direct blast waves at a sensor or a model to simulate actual explosions and their effects, usually on a smaller scale. The advantage of using the shock tube is that you can repeat the test more accurately than arena testing. The disadvantage is that the size of the shock tube restricts the size of the specimen.