SEMICOSIL® TEOS 999 LB is Tetraethoxysilane of ultra high purity. 

  • Empirical formula C8H20O4Si
  • Molecular weight 208,3


  • Ultra high chemical purity
  • Excellent trace metal purity
  • Very good Boron purity
  • Very good chloride purity

SEMICOSIL® TEOS 999 LB was developed for the Semiconductor Industry. A typical application is the use as precursor for low dielectric constant interlayer dielectrics. 


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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