Medshield India

The increasing awareness of the dangers of fire and smoke associated with the use of plastics has led to legislation and standardization of plastic formulations with regard to flame retardancy and smoke suppression. The corrosive and poisonous nature of the gases released in the combustion of plastics incorporating halogen-bearing materials has led to a demand for non-halogen flame retardant systems.

Magnesium Hydroxide Solid Solution (FRMHSS) is known to exhibit better flame retardancy and acid resistance than Magnesium Hydroxide itself. This property is due to ability of (FRMHSS) to dehydrate at a temperature (300 ⁰C) that is lower than that of Magnesium Hydroxide (340 ⁰C).

Magnesium Hydroxide (FRMHSS) is an efficient non-halogen flame retardant and smoke suppressant in many polymers including polyethylene, polypropylene, polystyrene,ABS and PVC. The flame-retardant effect is achieved by the endothermic decomposition of Mg (OH)₂ with resultant cooling by the release of water vapor.

Plastic applications require Magnesium Hydroxide with a crystalline structure, which has minimum distortion on reducing particle size. This ensures minimum adverse effect on the physical characteristics of the polymer in which it is incorporated. Magnesium Hydroxide (FRMHS) generated in our process meets this requirement to provide ideal flame-retardant products.

Zinc Borates have proven themselves to be highly effective in partial or complete replacement for Antimony Trioxide as a synergist in Polyvinyl Chloride and halogenated polyester formulations as well as in wide range of elastomers, thermoplastic elastomers, polyamides and polyolefins.

Zinc Borate is a white, non-hygroscopic free flowing powder. It has a lower specific gravity and offer lower weight per unit volume than Antimony trioxide. In addition they have lower pigment strength allowing lower pigment loading of highly colored products.

Zinc Borate acts as strong char promoter in many formulations; inhibits combustion and smoke formation by isolating the substrate from atmospheric oxygen. They also suppress afterglow.

Zinc Borate is a special hydrate, which retains water of hydration at temperature up to 280 ⁰C, and therefore high processing temperatures have been used successfully.

Zinc Borate is known to exhibit synergism with Zinc Hydroxystannate, Zinc Stannate, Alumina Trihydrate and Antimony Trioxide in halogenated systems.

Zinc Hydroxystannate and Zinc Stannate are active smoke suppressants as well as flame-retardants. Their superior performance is because of their dual phase mechanism. In addition of exhibiting vapor phase action, similar to Antimony Trioxide, they also exhibit condensed phase action during which they act as excellent char promoters. The condensed phase action of Zinc Hydroxystannate and Zinc Stannate enhances the formation of a thermally stable carbonaceous layer at the expense of aromatic, volatile, and flammable products. They exhibit synergy with Zinc Borate, Ammonium Octamolybdate and Antimony Trioxide.

Zinc Hydroxystannate and Zinc Stannate are effective in halogen free and halogen containing systems. Although there is generally little difference in the effectiveness of Zinc Hydroxystannate and Zinc Stannate, the latter is the preferred additive for polymers that are processed at temperatures above 200 ⁰C.

The experience gained in the synthesis of these products since year 1996 has enabled us to produce materials with properties that change these specialty materials in high performing materials. Zinc Hydroxystannate and Zinc Stannate produced by us are of very fine particle size that provides high surface area. The particles have organophillic surface that enables them to get easily disperse in polymer matrix.