Flame Retardants

Fire retardants are additives that are incorporated into materials to help prevent ignition, or to delay the spread of a fire.  Fire retardants also act as smoke suppressants to limit the amount of aromatic compounds released during a fire.

The flame retardant industry expanded in the 1970s when flammable synthetic materials became more abundant.  Over the last 40 years flame retardant chemicals have become widely used in furniture, electronics, textiles, construction, and in many other items in daily use.

FR materials are often used in a synergistic manner.  As a result, we have developed a wide range of flame retardant materials.

Choice of Flame Retardant

Aluminium Trihydroxide Supplier

Aluminium Trihydroxide (ATH)

Aluminium Trihydroxide is also known as aluminium hydroxide or hydrated alumina.  It is the most widely used halogen-free flame retardant chemical.  ATH induced flame retardancy is the result of the endothermic decomposition of aluminium hydroxide in to aluminium oxide and water at temperatures of around 200°C.  This process results in high heat absorption, the displacement of oxygen through water vapour production, and the formation is a ceramic char acting as a barrier to both heat and oxygen.


ATH products can be used in many industries – Glass Reinforced Plastics, Rubber, Latex Foams, Thermoplastics, Thermosets, Elastomers and Sealants.

RBH supply competitively priced Aluminium Trihydroxide (flame retardant grades)
  • Ground ATH with high whiteness >96%, standard whiteness >90% and low whiteness >85%.  It has relatively broad particle size distribution, making it more economical.
  • Ground ATH with low oil absorption has good viscosity stability with high pigment loadings.  This enables the finished product to have perfect brightness, a clean surface, and strong strength.
  • Precipitated ATH has narrower particle size distribution, high purity and high whiteness.
ATH Selection Chart
Safety Advisory

Ammonium Polyphosphate Supplier 

Ammonium Polyphosphate (APP)

Ammonium Polyphosphate (APP) is an environmentally friendly and halogen-free flame retardant.  It is widely used in textiles, coatings, rubbers, plastics and adhesives.

Depending on the polymerization degree, there are two main ranges: Phase I APP and Phase II APP.

APP Phase I has a short and linear chain (n < 100), it is more water sensitive (hydrolysis) and less thermally stable; it begins to decompose at temperatures above 150 °C.

APP Phase II has a high polymerization degree, with n>1000.  Its structure is cross linked.  It is a high quality non-halogenated flame retardant.  It has a higher thermal stability (meaning the decomposition starts at approximately 300°C) and lower water solubility than APP I.

We supply both grades of APP.

Main Applications:

Solvent based and water based intumescent coatings
Flame retardant for polyurethanes
Flame retardant for unsaturated polyesters
Flame retardant for epoxies
Flame retardant for acrylics

APP Selection Chart
Safety Advisory

Zinc Borate Supplier 

Zinc Borate (ZB) an extensively used fire retardant and smoke suppressant.

Zinc Borate is a non-halogen flame retardant accredited by the Environmental Protection Agency.  It is an inorganic and low toxicity amalgam and a vital additive that achieves brilliant resistance in rubber products.  It is a free-flowing white powder which dissolves easily and swiftly.  This chemical can be added to any flame retardant mechanism and will boost test results with minimum effect on compound properties.  Moreover this flame retardant chemical can create a glassy singe at high temperatures that averts flame propagation.  It aids in compounding fire-resistant, halogen-free rubber, which emits minimal acidic smoke.  It also produces water of hydration identical to ATH.  Zinc Borate is a synergist with halogenated fire retardants, ATH, APP and antimony oxide.

Zinc Borate Selection Chart
Safety Advisory

Dicyandiamide Supplier

Dicyandiamide is a white crystalline powder with a purity of 99.5%.

Dicyandiamide is used as a flame retardant in the paper, timber and textile industries.  It also serves as a synthesis component within the pharmaceutical industry, within the production of fertilisers, as a hardener for epoxy resins, as a condensation product for water treatment processes, and as a stabiliser compound for PVC flooring.

Dicyandiamide Selection Chart
Safety Advisory

Mono Pentaerythritol Supplier

Mono Pentaerythritol

Mono Pentaerythritol is an organic compound that is 95% pure pentaerythritol.  It is an odourless white or light yellow crystalline polyol that is soluble in water, slightly soluble in alcohol, dissolvable in benzene, ether, and petroleum ether.

Mono Pentaerythritol is mainly used in the manufacture of alkyd resins, fatty acid resin and resin esters.  The organic compound is a component in the making of paint and coatings, printing ink, coating adhesives, synthetic rubber, flame retardant paints and polyvinyl chloride stabilisers.

Mono Pentaerythritol Selection Chart
Safety Advisory