BELSIL® TMS 803 is the co-hydrolysis product of tetraalkoxysilane (Q unit) and trimethylethoxysilane (M unit). The chemical structure of BELSIL® TMS 803 can be seen as a three-dimensional network of polysilic acid units, which are endblocked with trimethylsilyl groups. Some residual ethoxy and hydroxy functions are present.

BELSIL® TMS 803 is a white powder manufactured in such a way that it is substantially free of aromatic solvents such as toluene. In keeping with its low content of fine dust particles and its uniform particles, BELSIL® TMS 803 exhibits excellent rheological properties (flowability).

BELSIL® TMS 803 can be compounded with polydimethylsiloxanes.

  • INCI Trimethylsiloxysilicate


This highly cross-linked silicone resin is primarily used for its film-forming attributes.

In sunscreen, skincare and color cosmetic applications, the Trimethylsiloxysilicate BELSIL® TMS 803 is an excellent water-resistant additive and helps to hold pigments in place. It prevents agglomeration and maintains free-flowing characteristics in loose powder products.

In haircare compositions, the silicone resin provides volume and body, while imparting humidity resistance to the hair.



The 'Best use before end' date of each batch is shown on the product label.

Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons

Sales and support

Wacker Chemical Corporation
3301 Sutton Road
Adrian, MI 49221-9397
United States
+1  888  922-5374 (Phone)

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