Flame-resistant protection facing the blast source, with enhanced fragmentation defense across the board.

Building upon the FP401, the FP401B adds a 6mm-thick layer of flame-resistant oxidized fiber fabric on the side facing potential explosives, providing enhanced protection against extreme heat and fragmentation impact.

• High-Strength Blast-Resistant Materials：
  - Inner Layer：Contact side made of 100% Aramid Fabrics (Kevlar) blast-resistant fiber cloth; non-contact side features a 6 mm-thick black flame-retardant oxidized fiber fabric.
  - Outer Layer：Nomex IIIA flame-retardant fabric.
  - Constructed and assembled using high-strength webbing and reinforced stitching.
• Internationally Certified Blast Resistance：
  - Testing Standard：U.S. Military Standard MIL-STD-662F.
  - Blast Resistance：V₅₀ at 1,250 f.p.s (standard model).
  - Test Conditions：.22 caliber, 17 grains (1.102 g) fragmentation projectile.
• Size and Color Options：
  - Sizes：120 x 120cm、150 x 150cm（±5%）.
  - Color：One side navy blue, one side black.
• Portability and Usage：
  - Includes a carrying bag for easy transport and storage.
• Optional Specifications：
  - Higher blast resistance available：V₅₀ at 1,450 f.p.s or 1,650 f.p.s.
  - Custom sizes available upon request.