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A fuel-resistant sealant fails at its weakest link: the base polymer. If the sealant sees fuel, oil and solvents, hydroxyl-terminated fluorosilicone oil is the raw material that sets both chemical resistance and cure behavior.
1. What IOTA 25O is
IOTA 25O is synthesized by polymerizing fluorosiloxane monomers with molecular ends modified by hydroxyl-bearing silicone materials. Beyond the general properties of methyl fluorosilicone oil, the terminal hydroxyl groups add reactivity: the oil can be cross-linked into elastomers or membranes, and medium-high viscosity grades serve as the base rubber for condensation-type room temperature vulcanized (RTV) fluorosilicone rubber.
The trifluoropropyl group brings excellent electrical insulation, high and low temperature resistance, high flash point and low freezing point — long-term service from -50°C to 250°C, with low viscosity-temperature coefficient, high compressibility, low surface tension, good hydrophobicity and moisture resistance, plus chemical and physiological inertness.
2. Specification (typical values)
|
Test |
Homopolymer structure |
Copolymer structure |
|
Appearance |
colorless or light yellow transparent liquid |
colorless or light yellow transparent liquid |
|
Fluorine content |
100% |
30%–60% |
|
Viscosity (mPa·s, 25°C) |
150–500,000 |
3,000–500,000 |
|
Volatile matter (150°C × 3h) |
≤5% |
≤5% |
3. Two roles in one product
FAQ
Q: Homopolymer or copolymer — which to start with? A: Match fluorine content to the fuel exposure: homopolymer (100% fluorine content) for maximum oil and fuel resistance; copolymer (30%–60%) when the formulation must balance fuel resistance with flexibility or cost.
Q: Which viscosity for a sealant base? A: Medium-high viscosity grades are the starting point for RTV sealant bases; lower viscosities work as diluents to adjust paste rheology.
Handling note: keep the product neutral and away from acidic or alkaline substances; store below 35°C, shelf life 12 months; transported as non-hazardous.
Product page: https://www.kimiter.com/product-hydroxyl-fluorosilicone-oil-my-l-1001.html
