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LS-673 Heptamethyltrisiloxane
CAS NO. 1873-88-7

Name: LS-673 Heptamethyltrisiloxane
Brand: Nanjing Silfluo New Material Co., Ltd.
Availability: InStock

Silfluo LS-673 is 1,1,1,3,5,5,5-Heptamethyltrisiloxane, a linear trisiloxane with a single central Si–H group.

The molecule contains one methylhydrogensiloxy unit flanked by two trimethylsiloxy end groups, giving a Me₃Si–O–SiHMe–O–SiMe₃ structure.

The central Si–H group undergoes platinum-catalyzed hydrosilylation with terminal olefins, including allyl-polyethers, to yield polyether-modified trisiloxane surfactants and other Si–H addition products.

Used as reactive intermediate for trisiloxane superspreader and surfactant synthesis, polyurethane foam stabilizer precursor, personal care silicone intermediate, and industrial wetting agent synthesis.

Where to buy CAS NO. 1873-88-7 PDF Download

Typical Physical Properties of LS-673 Heptamethyltrisiloxane

Silfluo Code:	LS-673
Chemical Name: Synonyms	1,1,1,3,5,5,5-Heptamethyltrisiloxane Bis(trimethylsiloxy)methylsilane
CAS No.: EINECS No.:	1873-88-7 217-496-1
Molecular Weight:	222.51
Appearance:	Colorless transparent liquid
Density (ρ20°C, g/cm³)	0.819
Refractive Index (n25/D)	1.382
Purity:	99% min

Features of LS-673 Heptamethyltrisiloxane

1. Highly reactive central Si-H functionality, enabling rapid, high-yield, and highly site-specific addition reactions (hydrosilylation) with various terminal olefins.

2. Compact, well-defined trisiloxane backbone that structurally imparts extreme hydrophobicity and unparalleled spreading capabilities to its derivative compounds.

Applications of LS-673 Heptamethyltrisiloxane

1. Trisiloxane superspreader and agrochemical adjuvant synthesis

Used as reactive intermediate for platinum-catalyzed addition with allyl-polyethers to produce polyether-modified trisiloxane superspreaders and agrochemical adjuvants.

2. Polyurethane foam stabilizer synthesis

Used as Si–H precursor for synthesizing silicone-polyether copolymer surfactants for rigid and flexible PU foam stabilization.

3. Personal care and cosmetic silicone intermediates

Used as precursor for alkyl-modified silicones and specialty sensory fluids in personal care formulations.

4. Industrial wetting agents and leveling agents

Used in synthesis of wetting agents, leveling agents, and defoamers for waterborne coatings, automotive finishes, and printing inks.

Packaging of LS-673 Heptamethyltrisiloxane

In 20kg pail, 160kg drum and 800kg IBC

Safety and Storage of LS-673 Heptamethyltrisiloxane

Keep away from heat and open flame. When stored at or below 25°C in the original unopened containers, this product has a usable life of 12 months from the date of production (200L drum)