Magma Firestop is NOT Borate based


It is important to understand about any products you use.  We can confirm that Magma Firestop is not a borate based product and as such has none of the associated issues related to boric acid.  Find out more below or click on the link to read the report.

There are Borate based Flame retardant chemicals available for thatched roofs and Magma Firestop is NOT one of them.

Magma Firestop® is environmentally friendly and non-toxic.

For more information see the press release to the right from The European Chemical Agency r.e. the List of Substances of Very High Concern

Information on the Substances of Very High Concern added to the Candidate List.

Substance Name
EC Number
CAS Number
Reason for Proposal
Potential Uses
Boric acid


toxic for reproduction, category 2
Boric acid is widely used on account of its consistency-influencing, flame-retarding, antiseptic and preservative properties. It is a component of detergents and cleaners, adhesives, toys, industrial fluids, brake fluids, glass, ceramics, flame retardants, paints, disinfectants, cosmetics, food additives, fertilisers, insecticides and other products.


European Chemical Agency Download

8 chemical substances to the Candidate List of Substances of Very High Concern (SVHC) for authorisation. Companies are advised to check their potential obligations that result from this listing.