Hydroxypropylheptamethyltrisiloxane, ethoxylated, hydroxy-terminated

Silicones
CAS 67674-67-3
IUPAC: hydroxypropylheptamethyltrisiloxane, ethoxylated, hydroxy-terminated

No GHS classification at typical use concentrations in finished products. Silicone surfactants in this class are generally low toxicity.

Hydroxypropylheptamethyltrisiloxane, ethoxylated, hydroxy-terminated (CAS 67674-67-3) is a silicone trisiloxane surfactant used as a superspreading wetting agent in aqueous formulations. Unlike the cyclic silicones D4 (cyclotetrasiloxane) and D5 (cyclopentasiloxane), this is a linear trisiloxane backbone and does not carry the PBT (persistent, bioaccumulative, toxic) or vPvB (very persistent, very bioaccumulative) classification that affects the cyclic variants. Used in very low concentrations as a surface-spreading modifier.

Health & environment profile

VOC: no
Prop 65 listed: no
Asthmagen: no
EPA Safer Choice: no
Aquatic toxicity: no
Biodegradable: no
Bioaccumulative: no
Persistent: no
Ozone depleting: no
Microplastic: no
PFAS: no
Env. score: 5/5

Purpose: Silicone-based surfactant (trisiloxane) — wetting agent and surface modifier that lowers surface tension and enhances spreading of aqueous formulas on hydrophobic surfaces

No products on file contain this (yet)

Health summaries are editorial — we synthesize from SDSs, peer-reviewed sources, and regulatory listings. Not medical advice.