GSA/ISC Blast Resistant Materials Performance

Blast Resistant Standards

The graph and table below show the GSA/ISC performance conditions for blast resistant products window system response.

Impulse = 1/2 x Pressure(psi) x Duration(msec)

Note:

• Be sure to specify pressure and impulse when ordering a blast-resistant product.
• Ballistic and forced-entry protection can also be specified and achieved in a blast-resistant product.
• U.S. Bulletproofing products meet and/or exceed UL 752 Ballistic Standards, GSA Blast, and DOD Forced Protection/Anti-Terrorism Criteria. Test reports are available upon request.

Performance Condition	Protection Level	Hazard Level	Description of Window Glazing Response
1	Safe	None	Glazing does not break. No visible damage to glazing or frame.
2	Very High	None	Glazing cracks but is retained by the frame. Dusting or very small fragments near sill or on floor acceptable.
3a	High	Very Low	Glazing cracks. Fragments enter space and land on floor no further than 3.3 ft. from the window.
3b	High	Low	Glazing cracks. Fragments enter space and land on floor no further than 10 ft. from the window.
4	Medium	Medium	Glazing cracks. Fragments enter space and land on the floor and impact a vertical witness panel at a distance of no more than 10 ft. from the window at a height no greater than 2 ft. above the floor.
5	Low	High	Glazing cracks and window system fails catastrophically. Fragments enter space impacting a vertical witness panel at a distance of no more than 10 ft. from the window at a height greater than 2 ft. above the floor.