Lanspec SI 30 is an effective emulsifier system for the preparation of stable poly(dimethylsiloxane) oil in water emulsions. Similar to Lanspec SI 20, it is applied to defoamers, textile softeners, lubricants, and releasing agents. At 25°C, it appears as a pale yellow to amber liquid, free from foreign matter, with a characteristic odor. It is dispersible in water and used in the preparation of poly(dimethylsiloxane) in water emulsions.

Functions: Emulsifier (O/W)

End Uses: Mold Release Agents

Technical Data Sheet

Ask P.A.T. Products Questions

Leo Coyle avatarErik Espling avatarLogan York avatar

Enhanced TDS

Identification & Functionality

Industrial Additives Functions

Applications & Uses

Industrial Additives End Use

Lanspec SI 30 is used in the preparation of Poly(dimethylsiloxane) in water emulsions, a typical emulsion system is shown below:

Poly(dimethylsiloxane) 30%
Water 60%
Lanspec SI 30 10%

The emulsion is produced by charging the water and Lanspec SI30, apply high shear mixing to the solution and slowly add the Poly(dimethylsiloxane), continue mixing until a homogeneous stable emulsion is produced.


Physical Form
Pale yellow to amber liquid free from foreign matter (at 25°C)
Dispersible in
Water (at 20°C)
Typical Properties
ValueUnitsTest Method / Conditions
Acid Value110 - 130mg KOH/g
Water Contentmax. 1.0%
pH (5% aqueous)2.5
Specific Gravity (at 25°C)1.01
Viscosity (at 25°C)825cP

Regulatory & Compliance

Certifications & Compliance

Packaging & Availability

Regional Availability
  • Canada
  • Mexico
  • USA
Packaging Information
  • Lanspec SI30 can be supplied in bulk road tankers, IBC’s, 200kg or 25kg nett drums.

Storage & Handling

Storage Conditions
  • Stainless steel, polyethylene or glass-lined equipment is necessary for the storage of Lanspec SI30 to prevent corrosion and subsequent contamination. This material can separate on standing and at low temperatures. May require agitation and warming before use.