Resistant to Sun and Cold: How Silicone Sealant Protects Joints
2026-08-07
It is extruded as a paste and gradually cures upon contact with moisture in the air, forming an elastic seal that fills gaps.
How Does It Seal?
The main chain of silicone consists of siloxane bonds, which have high bond energy and are not easily broken down by UV rays, ozone, or temperature fluctuations. Once cured, the sealant remains flexible and can move with the joint as it expands and contracts due to temperature changes, without easily cracking or hardening. This makes it relatively stable for long-term outdoor use.
Common Types
Acidic silicone sealant: Releases acetic acid during curing and has a distinct odor; suitable for acid-resistant substrates such as glass and ceramics.
Neutral silicone sealant: Releases alcohols or ketoximes during curing and has a milder odor; offers broader compatibility with substrates such as metal, concrete, and plastic.
Mold-Resistant Type: Contains mold-inhibiting additives and is used in damp areas such as bathrooms and kitchens.
Applications
It can be used in applications such as door and window installation, curtain wall joints, glass assembly, bathroom countertops, and pipe connections. For outdoor joints, weather-resistant neutral sealant is the preferred choice; for damp environments, use the mold-resistant type; and for surfaces that will be painted, ensure the sealant is compatible with the paint.
Steps for Applying Sealant
Clean the joint, removing dust, grease, and old sealant, and ensure it is dry.
Apply masking tape to prevent the sealant from spreading beyond the joint.
Use a caulking gun to apply the sealant into the joint at a steady rate, ensuring it is fully filled.
Smooth the surface with a scraper or your finger dipped in water, then remove the masking tape.
Allow the sealant to cure, avoiding contact with water and physical stress during this time.
More Products
The products cover silicone, acrylic, epoxy, MS, PU foam, Nail-free, etc. Products are widely used in construction, photovoltaic, electric power, automotive, industrial sealing and other fields.
