Name: Acetoxy Silicone Crosslinker SCA-100
Brand: Coatingsink
SKU: silicone-crosslinker-acetoxy-sca
Availability: InStock

Question 1

Why does acetoxy-cure silicone release acetic acid during cure, and is this a concern?

Accepted Answer

SCA-100 (methyltriacetoxysilane) reacts with atmospheric moisture and releases acetic acid as the cure by-product. The odour dissipates as the cure front progresses; however, the corrosive nature of acetic acid limits use on copper, zinc, and certain plastics where corrosion or stress-crazing can occur. For such substrates, an oxime- or alkoxy-cure crosslinker is preferred.

Question 2

What is the recommended loading level of SCA-100 in a one-component RTV sealant compound?

Accepted Answer

SCA-100 is typically incorporated at 5–10 phr relative to the base silicone polymer. Lower dosages (5–6 phr) yield softer, high-elongation sealants suitable for façade glazing, while higher loadings (8–10 phr) shorten tack-free time and raise Shore A hardness toward 30–40, which is more appropriate for structural bonding or automotive body sealing.

Question 3

How should SCA-100 be stored to prevent premature hydrolysis during warehousing?

Accepted Answer

Store in tightly sealed containers under a dry nitrogen or argon blanket at 5–25 °C, isolated from any source of moisture. Even brief exposure to humid air initiates hydrolysis, generating acetic acid that degrades crosslinker efficacy and may corrode metal container surfaces. Under correct conditions, shelf life is 12 months in original sealed packaging.

Flash Point	72°C
Active Content	≥98%
Density (25°C)	1.07 g/ml
Viscosity (25°C)	2–4 mPa·s
Recommended Dosage	5–10 phr

Acetoxy Silicone Crosslinker SCA-100

Specifications

FAQ

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