News Release

Sansin Announces FireStop, “Class A” One-Coat Flame Spread Protection for Interior Wood Substrates

The Sansin Corporation, a global leader in environmentally friendly, high-performance wood protection, announced a one-coat “Class A” fire retardant coating for interior wood including SPF plywood, Oriented Strand Board, wood trusses, glue laminated/cross laminated timbers (Glulam/CLT), construction studs and many assemblies where improved fire resistance is required.

As the popularity of wood as a building material continues to grow – for residential, multi-story building projects and mass timber buildings – architects and contractors have been wanting a wood coating that offers Class A fire protection, as well as showcasing the beauty of wood.

Sansin has introduced two products to meet market needs:

  • FireStop97 is a decorative, self-priming paint for wood substrates, available in white, pastel and light-colored wood tones. FireStop97 meets Class A flame spread ratings in just one coat and is fast drying, ultra-low VOC, durable and can be easily topcoated.
  • FireStop99 is a low-VOC, two-coat application with excellent adhesion. FireStop99 comes in clear or custom tinted tones for interior wood surfaces.

Both FireStop products intumesce (expand its film thickness) in the presence of heat or flame, creating a thick charred, heat-insulating foam layer. This action prevents oxygen from reaching the combustible coated materials (the “fuel”) and diluting combustible gases if released by the fuel. FireStop confirms to ASTM E84 and Canadian Standard CAN/ULC S-102-M88.

FireStop products are available through Sansin independent retailers carrying its industrial products and pre-finishing/machine-coating businesses.

“Wood has inherent fire protective properties through natural charring, but Sansin’s FireStop97 and FireStop99 provide heightened resistance,” says Sjoerd Bos, Managing Director at Sansin. “Sansin developed these products to meet the growing needs of architects and developers designing and planning mass timber buildings with safety, resilience and beauty in mind.”

To learn more about FireStop97 and FireStop99 visit

About Sansin
For over 30 years, Sansin has been the only wood protection company focused exclusively on researching and developing environmentally-friendly, water-borne interior and exterior wood products and technologies that deliver outstanding color, durability and performance without the toxicity found in conventional stains. Sansin Enviro Stains use water, not oil, to deeply penetrate and protect wood naturally, from within. Headquartered in Ontario, Canada, Sansin has dealer locations Canada, the U.S. and parts of Europe. To learn more about The Sansin Corporation, or how to become a Sansin preferred dealer, visit

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