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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 as excellent reinforcing agent for MS-polymer sealants:
transparent-MS-Polymer-Sealants