Silyl-terminated Polyether Sealant

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



Silyl-terminated polyether sealants are single-component, moisture-cured sealants. They typically contain the base polymer, filler, plasticizer, catalyst and various other additives. The sealants are often referred to as hybrid or modified polymer sealants. There may be variations in the chemistry of different types of modified polymer sealants, so this CP focuses on products identified as silane-modified polyethers. These sealants are often touted as environmentally-friendly, being free of solvents and isocyanates, however, phthalate plasticizers and tin catalysts are still common. Methanol is a product of the crosslinking reaction and is given off during cure. These sealants are elastomeric with movement capability of +/- 25% or more and can be used to seal interior and exterior gaps including siding and around windows and doors.

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


ChemSec - SIN List - PBT / vPvB (Persistent, Bioaccumulative, & Toxic / very Persistent & very Bioaccumulative) from 2-(2H-Benzotriazol-2-yl)-4,6-di-tert-pentylphenol

US CDC - Occupational Carcinogens - Occupational Carcinogen from Titanium dioxide

CA EPA - Prop 65 - Developmental toxicity from DIISODECYL PHTHALATE (DIDP) (primary CASRN is 26761-40-0)

EC - CEPA DSL - Bioaccumulative from 2-(2H-Benzotriazol-2-yl)-4,6-di-tert-pentylphenol

EC - CEPA DSL - Persistent from Calcium carbonate

ChemSec - SIN List - Endocrine Disruption from DIISODECYL PHTHALATE (DIDP) (primary CASRN is 26761-40-0)

GHS - Australia - H330 - Fatal if inhaled from Bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate

GHS - Australia - H318 - Causes serious eye damage from Bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate

GHS - Japan - Specific target organs/systemic toxicity following single exposure - Category 1 [H370] from Bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate

GHS - Japan - Hazardous to the aquatic environment (acute) - Category 2 [H401] from Bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate

GHS - Japan - Flammable liquids - Category 2 [H225] from Vinyltrimethoxysilane

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

Last updated: May 17, 2018