Overview
Tetra-(methylethylketoxime)silane (CAS 34206-40-1 ), commonly referred to in the silicone industry as TMEKS or ketoxime silane, is a tetrafunctional silane crosslinker used to cure silicone-based systems at room temperature.
It functions as the reactive core component in oxime-cure silicone formulations, releasing butanone oxime upon moisture exposure to initiate network formation. Its primary use is as a crosslinker in one-component room-temperature vulcanizing silicone sealants.
In these systems, it governs cure speed, mechanical strength, and adhesion to substrates such as glass, metal, and plastics. In construction and glazing applications, it is incorporated into neutral-cure silicone sealants for curtain wall systems.
It is also utilized for window sealing and sanitary joints. Silicone coating formulations for industrial and protective applications use it to build crosslink density and improve surface durability across various substrates.
The product is also used in silicone adhesive systems where controlled cure kinetics and compatibility with silicone polymer blends are required. This ensures high performance in demanding industrial environments and bonding applications.
Tetra-(methylethylketoxime)silane is supplied as a clear liquid, typically in drums or IBC containers suited to moisture-sensitive handling requirements. Packaging under inert atmosphere is standard practice to preserve reactivity.
The material is available in Technical grade , which is the standard commercial offering. Purity specifications are commonly at 97% or higher to ensure consistent performance during the chemical formulation process.
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Physical Properties
| Melting Point | <0°C |
| Boiling Point | 111°C |
| Density | 0.932 g/cm³ |
| Flash Point | 4°C (Toluene) |
| Appearance | Clear, yellow liquid |
| Water Solubility | 36.63g/L |
| Vapor Pressure | 0.002Pa at 25℃ |
| Refractive Index | 1.483 [20°C] |
Safety & Handling
Danger GHS02 GHS07 GHS08 Hazard Statements H228 Flammable solid H315 Causes skin irritation H317 May cause an allergic skin reaction H319 Causes serious eye irritation H373 May causes damage to organs through prolonged or repeated exposure Precautionary Statements P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking. P240 Ground and bond container and receiving equipment. P241 Use explosion-proof [electrical/ventilating/lighting/…] equipment. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P272 Contaminated work clothing should not be allowed out of the workplace. P280 Wear protective gloves/protective clothing/eye protection/face protection. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P332+P317 Get emergency medical help. P333+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P370+P378 Use … for extinction. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Other Names
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Chemical Properties
- CAS Number
- 34206-40-1
- EC Number
- 251-882-0
- Mol. Weight
- 372.53
- Category
- Polymers & Resins