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Evonik Modifier 705

Evonik Modifier 705 refers to SiH-terminated polydimethyl siloxanes utilized as plasticizers in addition-curing silicones. Due to their difunctional structure, these products do not crosslink but extend the chains of vinyl-terminated silicone polymers (Polymer VS). The use of these modifiers reduces crosslinking density and, consequently, the elastomer's hardness.

Chemical Family: Siloxanes

Functions: Chain Extender, Plasticizer

Knowde Enhanced TDS

Identification & Functionality

Chemical Family
CASE Ingredients Functions
Technologies

Applications & Uses

Cure Method
Adhesive & Sealant Type
Typical Applications

Use of the modifiers allows obtaining products with a low Shore hardness, even when using low-viscosity vinyl polymers. These modifiers are therefore used in formulations that have a low viscosity prior to crosslinking and should have low Shore hardness after crosslinking. Another important modifier application is the formulation of silicone gels. When working with two-component silicone formulations, it must be ensured that Pt-catalyst (e. g. Catalyst 500 series) and modifier are kept strictly apart. Further information about the formulat

Handling & Processing

Attention must in particular be paid to the fact that silicones containing SiH may generate hazardous hydrogen gas in connection with certain pollutants. For further information, please consult e. g. www.silicones-safety.com.The rules and regulations for the handling and use of chemicals have to be observed.

Properties

Appearance
Clear, colorless liquid
Technical Data
ValueUnitsTest Method / Conditions
SiH Content0.2mmol/g
Viscosity (at 25°C)500mPa·s
Refractive Index (nD²⁰)1.405
Density (at 20°C)approx. 1g/cm³

Regulatory & Compliance

Packaging & Availability

Packaging Type
Packaging

190 kg drum, 900 kg IBC PE

Storage & Handling

Shelf Life
24 months
Storage

Dry, up to 30°C (86 °F) in sealed containers, do not permanently expose to intensive sunlight.