Non-Combustible Sodium Silicate Caulk

A Common Product profile (CP) is a type of data record originally developed as part of a collaboration called the Quartz Project. The profiles are not specific to any manufacturer, but list the substances that are most commonly present in a product type. The CPs include a general description of the product type, a list of the most common substances serving each function in the product, and the health hazards associated with these substances. See the CP methodology here for more information.

This CP presents research done by Healthy Building Network alone following the completion of the Quartz effort.

Representative Manufacturers



This CP describes a single component, non-combustible sealant with a sodium silicate chemistry. This is a non-intumescent mortar-type caulk which is designed to meet ASTM E-136 requirements for non-combustible materials and is used as a draft, smoke, and fireblocking sealant. The caulk can be used to seal penetrations around ducting and electrical and plumbing penetrations. The noncombustible specification is common for one and two family construction and non-rated assemblies in multi-family and commercial construction. This type of sealant is not recommended where there is continuous vibration or in areas expected to come into contact with water.

This information reflects our best understanding of product composition in 2016.


EC - CEPA DSL - Persistent from Ferric oxide

MAK - Carcinogen Group 3B - Evidence of carcinogenic effects but not sufficient for classification from Ferric oxide

TEDX - Potential Endocrine Disruptors - Potential Endocrine Disruptor from Sodium silicate

GHS - Japan - Serious eye damage / eye irritation - Category 1 [H318] from Ferric oxide

EU - GHS (H-Statements) - H314 - Causes severe skin burns and eye damage from Sodium hydroxide

GHS - Japan - Specific target organs/systemic toxicity following single exposure - Category 1 [H370] from Sodium hydroxide

See the Pharos record HERE for more details and the sources used to create this Common Product profile.

Last updated: May 17, 2018