Marshall Additive Technologies (MAT), a division of The R.J. Marshall Company, is a premier supplier of highly effective flame retardant and smoke suppressant additives for polymers. MAT specializes in cost effective replacements for antimony trioxide and ammonium octamolybdate. MAT also offers flame retardant and smoke suppressant products alumina trihydrate, magnesium hydroxide, zinc borate, zinc stannate and zinc hydroxystannate.
Marshall Additive Technologies


There are three methods for flame retardance: vapor phase inhibition, solid phase char formation, and quench and cool systems that work by removing or reducing heat, fuel or oxygen.

solid phase char formation

Vapor Phase Inhibition

This approach works by removing flammable gaseous chemicals from the burning plastic. Chlorine and bromine based chemicals and polymers are used as the active flame retardants with MAT’s C-TEC FR blends FRZ8S, FRZ20S, FRZ30S, FRINT3 antimony trioxide replacements in this phase. Or with antimony trioxide using MAT’s CTAO.

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vapor phase inhibition

Solid Phase Char Formation

Flame retardants are designed to build up a barrier layer, once the fire has begun thus eliminating the fuel by char and protects the plastic. MAT’s popular C-TEC LS blends LSZ4AF, LSZ8AF, LSZ20A, and ammonium octamolybdate CTAOM work in this way and act as powerful smoke suppressants.

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quench & cool systems

Quench & Cool Systems

Utilize hydrated minerals because of the endothermic water release process that occurs when the system is heated. In the presence of fire, the hydrated minerals release water molecules that cool the polymer and suppresses the combustion process. MAT’s alumina trihydrate (ATH) and magnesium hydroxide work in this way.

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Flame Retardant Solutions

We manufacture, formulate, and distribute highly effective polymer flame retardant and smoke suppression additives to meet the most critical of regulatory standards. Our proven, cost effective antimony trioxide and ammonium octamolybdate replacement products are being used around the world. In addition to our broad range of standard products we also specialize in working closely with our customers to create tailored solutions for their applications. This flexibility allows us to customize optimal solutions that balance economics with technical performance.

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Commitment to Quality

We strive to achieve total customer satisfaction by assuring that each product delivered or service provided consistently meets or exceeds our established standards.

As part of our dedication to quality we will:

  • Develop and nurture an environment conducive to the highest standards of quality, commitment, and continue improvement.
  • Partner with and monitor our vendors and suppliers to obtain the most consistent and highest quality materials and service.
  • Use statistical methods to understand and manage the actions of our total organization.
  • Dedicate ourselves to continuous improvement in all activities of our business.
  • Continually strive to develop our employees though training and education.
  • Quality will be achieved though prevention of defects rather than detection.
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Current News

ATH and MDH in elastomers

Elastomers can tolerate ATH or MDH loadings of 60% or somewhat higher without loss of useful properties although hardness is obviously increased. ATH is substantially less costly but limits processing temperatures to below about 200–220 °C. A combination of roughly equal amounts of ATH and MDH will often be found more effective in flame retardancy than …

Rubber Flame Retardancy

Two classic approaches to flame retardancy of rubber are the incorporation of a halogen-antimony system and of a water-generating heat-sink additive such as ATH or MDH. Often, these two systems are used together. A “standard package” may be 15–20 phr of chloroparaffin (70% Cl, a solid chloroparaffin). An improved package to pass a more stringent …

Antimony Trioxide – Did you know?

Antimony trioxide is rated as R40 in the EU (limited evidence of a carcinogenic effect). The US EPA has not given it a carcinogenicity classification. It seems to have little ecotoxicological problem but in some jurisdictions it qualifies as a “heavy metal.” As a synergist for halogenated flame retardants, it is difficult to find alternatives, …