Manta TMOS
High-Purity Tetramethoxysilane (Orthosilicic Acid Tetramethyl Ester)
Crosslinkers & Modifiers
Tetraethyl Orthosilicate (TEOS) | Manta TEOS28
Manta TEOS28 is tetraethoxysilane (tetraethyl orthosilicate, CAS 78-10-4), a silicon dioxide source that undergoes controlled hydrolysis and condensation to form an inorganic silica network. It is used as a binder in precision investment casting, as a starting material for sol-gel coatings and for consolidating natural stone. It releases ethanol on hydrolysis.
- Grade
- TEOS28
- Chemical Name
- Tetraethoxysilane / Tetraethyl Orthosilicate
- CAS No.
- 78-10-4
- EINECS
- 201-083-8
- Formula
- C8H20O4Si
- Form
- Colorless transparent liquid
Overview
Manta TEOS28 is a clear, colorless liquid that serves as a versatile source of silicon dioxide (SiO2). Through controlled hydrolysis and condensation it forms a durable inorganic silica network and releases ethanol, giving a hard, heat-resistant and chemical-resistant binder.
It is used as a primary binder for refractory fillers in precision casting molds, as the central starting material for sol-gel glass-like coatings, and as a consolidant for natural stone, where it reacts with moisture to form a silica-gel binder within the pores. Total chlorine and total cation limits are listed in the specification table.
Compared with Manta TMOS, TEOS28 hydrolyzes more slowly and has a lower silica yield by weight, and it releases ethanol rather than methanol. TMOS is the faster-reacting grade, while TEOS28 offers balanced reactivity.
Key Features
- Forms a hard, heat-resistant and chemical-resistant silica binder on complete hydrolysis
- Binder for investment casting with good thermal stability and surface finish
- Penetrates porous substrates such as natural stone to increase structural integrity and weather resistance
- High-purity precursor for ultra-fine powders and sol-gel coatings
- Balanced reactivity for controlled hydrolysis and condensation
- Releases ethanol rather than methanol on hydrolysis
Cross-Reference
Manta TEOS28 can be considered as an alternative to Momentive Silquest TEOS Pure, Evonik Dynasylan A and Wacker TES 28.
Trademarks are the property of their respective owners; no affiliation is implied.
Specifications
| Property | Typical Value |
|---|---|
| Molecular Weight | 208.33 |
| Appearance | Colorless transparent liquid |
| Density (25°C, g/cm3) | 0.920-0.960 |
| Refractive Index (n25/D) | 1.3750-1.3990 |
| Flash Point, Closed Cup, °C | 48 |
| Assay (%) | 99.5min |
| Total Chlorine Content (ppm) | <0.5 |
| Total Cation Content (ppm) | <1 |
| Boiling Point (760mmHg) | 168°C |
Typical values from the current Technical Data Sheet.
Applications
- Precision investment casting: primary binder for refractory fillers such as zircon or silica in casting molds, giving high thermal stability, good dimensional accuracy and a good surface finish on precision metal parts
- Sol-gel and coatings: starting material for glass-like coatings, chemical-resistant and heat-resistant finishes on metals, glass and polymers, and anti-scratch and anti-reflective optical treatments
- Stone consolidation: natural stone, masonry and historic monuments, where it reacts with moisture to form a breathable silica-gel binder network within the pores and increases substrate strength
- Fluorescent and fine powders: complete hydrolysis generates high-purity, nano-sized silicon oxide powders used as precursors for phosphors in LED and display technologies
- Resin modification: polymerization of silicone resins for paints and surface modifiers, and improved thermal stability and mechanical performance of organic resins such as epoxies and polyurethanes
- Chemical intermediate: raw material for specialized silicon macromolecular compounds and organofunctional silanes
Related applications: Paints & Coatings
Packaging & Storage
Supplied in 20 kg pail, 180 kg drum and 900 kg IBC.
Safety and Storage
Storage: Store in a cool, well-ventilated place away from fire and water. Ensure containers are tightly sealed to prevent moisture contact.
Shelf Life: 12 months in original, unopened containers.
Documents
- Technical Data Sheet · PDF Download TDS
- SDS and COA · on request Request Documents
Frequently Asked Questions
How much silica does Manta TEOS28 deliver on hydrolysis?
Complete hydrolysis yields approximately 28.8% silica (SiO2) and releases ethanol, forming a hard, heat-resistant and chemical-resistant binder. By comparison, Manta TMOS yields approximately 39.5% silica by weight.
Why is Manta TEOS28 used as a binder in investment casting?
It binds refractory fillers such as zircon or silica in precision casting molds, providing high thermal stability, good dimensional accuracy and a good surface finish on precision metal parts.
How does Manta TEOS28 consolidate natural stone and masonry?
Applied to porous stone, masonry or historic monuments, it reacts with moisture to form a silica-gel binder within the pores. This increases substrate strength and forms a breathable binder network that consolidates the stone against environmental degradation.
Related Products
TEOS28 is one step in the sealant and adhesive formulation chain. One inquiry can cover the other raw materials in your formulation, with samples, technical documents, quotation and shipment handled together.
Looking for a different purity, functional group, or a structure not listed here? Contact our technical team.
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