Acetoxy Silicone Sealant

Acetoxy silicone sealant is the fastest-curing and lowest-cost of the three silicone chemistries we manufacture. It is named after the acetic acid released as the polymer cross-links — the sharp vinegar smell that fills a room while a joint is skinning over. That same acid is the reason the product is specified precisely: it delivers the highest initial tack and the quickest skin formation of any silicone, and it is chemically incompatible with a short but important list of substrates.

Buyers searching for non-acetoxy silicone are looking for the opposite chemistry — what the industry calls neutral cure. If your joint runs against copper, mirror backing, marble or concrete, that is the grade you need, and our neutral cure silicone sealant covers it. If the substrates are glass, glazed ceramic, aluminium or uPVC, acetoxy is the faster and cheaper choice and there is no performance reason to pay for neutral.

Acetoxy sealant skins over faster than a neutral cure grade and then cures from the surface inward, at a rate set by temperature, humidity and joint depth. It suits glass-to-glass joints that move very little, and is less suited to wide construction expansion joints, where the movement class on the datasheet matters more than skin time. The measured skin time, hardness, tensile strength, elongation and movement class for our grade belong on its production TDS — ask for it, and for the test report behind any standard it names, with your quotation.

Acetoxy vs Neutral (Non-Acetoxy) Silicone

For a fuller treatment of when each chemistry is appropriate, see our guide to neutral vs acetoxy silicone sealant.

Substrate Compatibility

Substrate compatibility is the single decision that determines whether acetoxy is the right specification. The table below is the short version of the rule: acetoxy is for non-porous, acid-stable surfaces.

Where any listed substrate is unsuitable, specify neutral cure silicone sealant instead — it carries no acid. For mirrors and natural stone, also confirm that the neutral grade is compatible with that backing or stone.

Key Features

• Skins over faster than neutral cure — the skin time for the grade is on its TDS
• Suited to glass-to-glass and glazing bead work on non-porous surfaces
• Transparent grade for display glazing — confirm the grade against your glazing specification
• Mildew-resistant grade available for sanitary and wet-area joints
• Lower cost per cartridge than neutral cure — high-volume glazing economics

Technical Specifications

Indicative values for the series. Figures move with the grade, the substrate pair, coat weight and cure conditions, so treat them as a basis for comparison rather than a specification — the technical data sheet for the grade you are supplied states the values that apply to it, and the conditions they were measured under.

Applications

• Glass-to-glass bonding — display cabinets, shower enclosures, aquariums
• Glazing bead and window sealing on aluminium and uPVC frames
• Sanitary sealing — baths, basins, shower trays (mildew-resistant grade)
• Interior joint sealing on glazed tile and non-porous surfaces
• General-purpose sealing where substrates are glass, glazed ceramic or plastic

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Available Packaging

Acetoxy silicone sealant ships in 280ml and 300ml cartridges for standard caulking guns, 590ml sausage packs for high-output glazing work, and 20L pails for production line dispensing. Clear, white, black and grey are stock colours; clear is the highest-volume grade for glass work. Private label cartridges with your own artwork and multilingual regulatory markings are available — see our private label service.

Certifications & Compliance

We list a standard here only once the test report for this grade has been checked. Tell us which standard your project cites — ASTM C920, EN 15651 and GB/T 14683 are the usual ones for sealants — and we will confirm what the grade has been tested to.