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

Functions: Emulsifier (O/W)

End Uses: Mold Release Agents

Technical Data Sheet

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Erik Espling


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Identification & Functionality

Applications & Uses

Industrial Additives End Use

Lanspec SI20 is used in the preparation of Poly(dimethylsiloxane) in water emulsions, a typical emulsion system is shown below:

Poly(dimethylsiloxane) 70%
Water 20%
Lanspec SI20 10%

The emulsion is produced by charging the Poly(dimethylsiloxane) and Lanspec SI20, applying high-speed mixing to the mixture and then slowly adding the water, continuing mixing until a homogeneous stable emulsion is produced.


Physical Form
Colorless to pale yellow hazy liquid free from foreign matter (at 25°C)
Dispersible in
Water (at 20°C)
Typical Properties
ValueUnitsTest Method / Conditions
Cloud Point (5g in 45g BDG/water)64 - 70°C-
pH (1% solution)5.0 - 8.0--
pH (5% aqueous)6.5--
Specific Gravity (at 25°C)0.94--
Viscosity (at 25°C)140cP-

Regulatory & Compliance

Certifications & Compliance

Packaging & Availability

Packaging Type
Regional Availability
  • Canada
  • Mexico
  • USA
Packaging Information
  • Lanspec SI20 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 SI20 to prevent corrosion and subsequent contamination.
  • This material can separate on standing and at low temperatures. May require agitation and warming before use.