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AEROSIL® fumed silica in adhesives and sealants based on silane-modified-polymers (SMP)

Adhesives and sealants based on SMP-polymers consist mainly of MS-polymers, STPU or STPE-polymers, fillers, thixotropes, reinforcing agents, silanes and drying agents. These systems are also called hybrid-adhesives and sealants.

Only hydrophobic AEROSIL® grades are recommended as thixotropes and reinforcing agents for theses systems, because SMP-adhesives and sealants cure via moisture and silane functionality of the polymers.

Especially AEROSIL® R 972, AEROSIL® R 202 and AEROSIL® R 208 are suggested as thickening agents and thixotropes as well as reinforcing agents for filled systems, while AEROSIL® R 972, AEROSIL® R 106, AEROSIL® R 805 and AEROSIL® R 812 S are recommended for transparent SMP-adhesives and sealants.

The structure-modified, hydrophobic fumed silica AEROSIL® R 8200 is suggested as excellent reinforcing agent both for filled and for transparent SMP-adhesives and sealants.

Recommended AEROSIL® grades for SMP-adhesives and sealants:

SMP-adhesives and sealants

AEROSIL® grades

Wt.-%

Incorporation methods

Filled

AEROSIL® R 972

AEROSIL® R 106

AEROSIL® R 202

AEROSIL® R 208

1-6

Planetary-dissolver, planetary-mixer, kneader, dissolver with scraper

Transparent

AEROSIL® R 972

AEROSIL® R 974

AEROSIL® R 106

AEROSIL® R 805

AEROSIL® R 812 S

1-12

Planetary-dissolver, planetary-mixer, kneader, dissolver with scraper

High-strength

AEROSIL® R 8200

AEROSIL® R 9200

5-30

Planetary-dissolver, planetary-mixer, kneader, dissolver with scraper

 

AEROSIL R 8200 in transparent MS Polymer sealants

AEROSIL® R 8200 improves both tensile strength and elongation at break of transparent MS PolymerTM sealants!