Flamtard

Flamtard H (zinc hydroxystannate) is an insoluble, non-hazardous, antimony-free flame retardant synergist that inhibits the development of flames and smoke in polymers. In halogen-containing polymers, the material has both condensed and vapor phase action during combustion. At 220 °C, the material releases 15w% of water, then at higher temperatures (400 °C - 600 °C) zinc and tin ions exert catalytic activity that inhibits the radical chain reaction causing the flame. In halogen-free polymers Flamtard H can increase the char consistency and strength.

Flamtard S (zinc stannate) is an insoluble, non-hazardous, antimony-free flame retardant synergist, and is increasingly being used in green applications, particularly in the electronics industry. It is extremely effective in PVC systems for cable sheathing, epoxy resins for printed circuit boards, polyamides and surface coatings. Flamtard S is thermally stable up to 400 °C; at higher temperatures (400 °C - 600 °C) zinc and tin ions exert catalytic activity that inhibits the radical chain reaction causing the flame.

Flamtard V grades are inorganic silicate based flame retardant synergists, chemically modified to control the glass transition temperatures over which they soften (470-500 °C). Above this they convert into a highly viscous molten state in which they can help to reduce the creation and propagation of micro cracks in char formation during polymer combustion. Flamtard V can also improve adhesion of metal oxide residues and oxidized organic materials, leading to mechanically stronger chars. Flamtard V can be used in mica filled silicon based security cables, flame retardant intumescent PVC and PUR materials for the building and construction industry, polyamides and polyolefins. For other polymers, check the potential stability with TGA first. This proven replacement for antimony trioxide can be used alone or in conjunction with other materials in the Flamtard range.