Tetramethyl Orthosilicate CAS 681-84-5

Chemical Name: Tetramethyl orthosilicate
Synonyms: Methyl orthosilicate; Tetramethoxysilane; TMOS
CAS No.: 681-84-5
Molecular Fomula: C4H12O4Si
Molecular weight: 152.22
Appearance: White or off-white powder
Assay: 99%

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Tetramethyl Orthosilicate (CAS 681-84-5): Comprehensive User Guide

1. Product Overview & Specifications

Tetramethyl Orthosilicate (TMOS), CAS 681-84-5, is a silicon-based compound widely used in industrial applications. Key parameters:

Parameter TMOS TEOS Methyl Triethoxysilane
Chemical Formula C4H12O4Si C8H20O4Si C7H18O3Si
Molecular Weight 152.22 g/mol 208.33 g/mol 178.30 g/mol
Hydrolysis Rate Fast Moderate Slow
Typical Applications Semiconductors, Nanocoatings Adhesives, Sealants Waterproofing

2. Key Applications & Industrial Uses

2.1 Coatings & Surface Treatments

Used as crosslinking agent in:

  • Anti-reflective optical coatings
  • Corrosion-resistant metal treatments
  • Hydrophobic surface modifications

2.2 Electronics Manufacturing

Critical for:

  • Semiconductor passivation layers
  • Low-κ dielectric materials
  • MEMS device fabrication

3. Step-by-Step Usage Guidelines

3.1 Sol-Gel Processing Example

  1. Mix TMOS with ethanol (1:4 ratio)
  2. Add acid catalyst (pH 3-4)
  3. Hydrolyze at 50°C for 2 hours
  4. Age solution for 24-48 hours

3.2 Safety Protocols

  • Use PPE: Nitrile gloves, vapor respirator
  • Store in nitrogen-purged containers
  • Keep away from strong oxidizers

4. Real-World Customer Case Studies

Case Study 1: NanoTech Coatings Ltd.

Challenge: Develop scratch-resistant smartphone screen coating
Solution: 15% TMOS in hybrid sol-gel formulation
Result: 62% improvement in pencil hardness (9H rating)

Case Study 2: SemiCon Solutions Inc.

Challenge: Reduce dielectric constant in 7nm chips
Solution: TMOS-based porous silica layer
Result: Achieved κ=2.1 with 98% uniformity

5. Technical Support & Inquiry

Contact our silicon chemistry experts:

Why Choose Us?

  • 99.9% purity guaranteed
  • Bulk quantities (200MT/month capacity)
  • REACH & ISO 9001 certified

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