What Is HT S25A Anti-Fungal Silicone Sealant?

The HT S25A Anti-Fungal Silicone Sealant is a one-part, neutral cure, high modulus silicone designed for long-lasting weatherproofing and waterproofing in high-humidity environments.
It contains an antifungal agent that effectively blocks the growth of mold and fungus while being safe for human contact.
This sealant cures at room temperature upon exposure to atmospheric moisture, providing excellent adhesion to glass, metal, ceramics, wood, and other construction materials.

Key Benefits

• Antifungal Protection – Inhibits mold and mildew growth in wet or humid areas.
• Neutral Cure – Non-corrosive, low odor, and suitable for sensitive substrates.
• Excellent Waterproofing – Provides reliable sealing against water and air penetration.
• Durability – Withstands extreme temperatures (−48 °C to +149 °C) and UV exposure.
• Movement Capability – ±25% dynamic joint movement (ASTM C719).
• Compliance – Meets ASTM C920 and ISO 846 standards; TÜV SÜD PSB tested.

Applications

• Kitchen sinks, bathrooms, and other high-moisture environments.
• Sealing joints in glass, metal, concrete, ceramic, wood, and plastics.
• Glass-to-glass and glass-to-metal sashing applications.
• Prefabricated housing, freight containers, and cold storage interiors.
• Ductwork and areas prone to fungal exposure.

Packaging

• Cartridges: 300 ml, 25 units per carton.
• Colors: Translucent Clear, White, Black (custom colors available).
• Storage: Store at 15–27 °C; avoid >50 °C and moisture exposure.
• Shelf Life: 12 months in unopened packaging (see “Use Before Date”).

Technical Specifications

Frequently Asked Questions

Is HT S25A Anti-Fungal Silicone Sealant waterproof?

Yes. It provides excellent waterproofing performance, forming a reliable seal against water and air penetration, making it suitable for kitchens, bathrooms, and other high-moisture environments.

Does HT S25A prevent mold and mildew?

Yes, it contains an antifungal agent that actively inhibits the growth of mold and mildew in wet or humid areas, while remaining safe for human contact.

What surfaces does HT S25A adhere to?

It bonds well to glass, metal, concrete, ceramic, wood, and plastics, including glass-to-glass and glass-to-metal sashing applications.

What temperature range can HT S25A withstand?

Once cured, it withstands extreme temperatures from −48 °C to +149 °C and resists UV exposure.

Is HT S25A compliant with industry standards?

Yes, it meets ASTM C920 and ISO 846 standards and is TÜV SÜD PSB tested, with ±25% dynamic joint movement capability per ASTM C719.

How is HT S25A packaged?

It is supplied in 300 ml cartridges, 25 units per carton, available in Translucent Clear, White, and Black (custom colors available on request), with a 12-month shelf life when unopened.