flame and smoke blogThe R.J. Marshall Company has been an industry leader in flame retardant and smoke reduction technology for over 30 years. The purpose of our flame & smoke blog is to keep our customers informed of our latest product developments, testing results, industry news, regulation updates, and product trends. If you have any questions, comments or suggestions, send us a message on our contact us page. For a complete list of products, please check out our Alumina Trihydrate and Marshall Additive Technologies flame retardant and smoke suppressant pages and brochures.

Flame retardant (FR) and smoke suppressant (SS) additives comprise two separate technologies within the specialty additives industry. Each technology has its own unique chemistries, products, applications, producers, users, end markets, screen tests and certification tests. There are many, many individual topics within each of these technologies. This blog is meant to provide brief capsules on very specific topics within each additive specialty. We hope you find this interesting and we welcome your feedback and any questions. As always, RJM MAT personnel stand ready to assist you with your flame retardant and smoke suppressant requirements. Please feel free to contact us. We are happy to help.

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 … Continue reading

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 … Continue reading


Huntite-Hydromagnesite is a natural mineral mined in Greece and Turkey and sold by R.J. Marshall as C-TEC MC9. It is an approximately equal mixture of huntite, Mg3Ca(CO3)4, and hydromagnesite, Mg4(CO3)(OH)2∙3H2O, and is dried, crushed, finely ground, and classified to produce … Continue reading