Fire Sleeves with Hook and Loop Fasterner are made by silicone rubber and fiberglass, it can withstand repeated exposures to molten steel, molten aluminum and molten glass up to 3000°F (1650°C).

BSTFLEX is making 2 different fire sleeve with velcro.

Type 1 is made by normal fire sleeve, slit it and sewn with velcro.

Type 2 is made by 96 oz fire blanket, slit it and sewn with velcro.

They are made by same materials, fireproof silicone with fiberglass. 

These fire sleeves will withstand continuous exposure to 500° F (260°C); up to 2000°F (1090°C) for 15-20 minutes; and up to 3000°F (1650°C) for 15-30 seconds.

But the size range is not same, type 1 size from ID 10 to 145 mm, type 2 size from ID 10 to 350 mm. Type 1 is more soft.

BSTFLEX is a profesional fire sleeve manufacturer, any question please feel free to contact us.