What is waterproof silicone adhesive?

Waterproof silicone adhesive is a type of adhesive with silicone as its base component, manufactured through a special formula and process. It possesses waterproof and sealing properties and is widely used in electronics, construction, automotive, medical, and other fields.

The following is a detailed introduction:

I. Core Components and Characteristics
**Base Components:** Primarily composed of silicone rubber (polysiloxane), with properties adjusted by crosslinking agents, catalysts, fillers, and other additives to form an elastic sealant.

Key Characteristics
**Waterproofing:** After curing, it forms a dense, elastic layer that effectively blocks moisture penetration, achieving a waterproof rating of IP67 (short-term immersion) or even higher.

**Weather Resistance:** Resistant to UV rays, high temperatures (typically -50℃ to 200℃), and chemical corrosion, suitable for long-term outdoor use.

**Elastic Sealing:** Remains soft and elastic after curing, adapting to the thermal expansion and contraction of the substrate and preventing cracking.

**Environmental Compliance:** Most products comply with RoHS, REACH, and other environmental standards; non-toxic and odorless; some have obtained food-grade certification.

II. Waterproof Silicone Adhesive
Main Types
Product Model: KN-300N
Bonding Process: Bonds at room temperature
Common Applications: KN-300N slow-drying waterproof adhesive is suitable for bonding silicone to silicone (wood, bamboo, metal, fabric, plastic, etc.) materials.

III. Application Areas
Electronics Industry: Sealing gaps in the casings of mobile phones, tablets, smartwatches, and other electronic products to prevent water ingress and short circuits.

Protecting circuit boards, sensors, and other precision components from moisture and corrosion.

Construction Industry: Waterproofing and sealing of areas such as bathrooms, kitchens, and balconies (e.g., tile grout, door and window frame sealing).

Waterproofing treatment for roofs, basements, swimming pools, and other projects.

Automotive Industry: Sealing headlights, sunroofs, doors, and other parts to prevent rainwater infiltration.

Protecting critical components such as engine compartments and battery packs from moisture and dust.

Medical Industry: Manufacturing medical catheters and seals, requiring compliance with biocompatibility standards (e.g., ISO 10993).

Industrial Industry: Sealing pipes, valves, pumps, and other equipment to prevent liquid leaks. Protect outdoor equipment (such as solar panels and surveillance cameras) from rain damage.

IV. Usage and Precautions

Surface Preparation: Clean the substrate surface, removing oil, dust, and rust. Ensure it is dry and free of moisture.

For non-absorbent surfaces (such as metal and glass), sanding or applying a primer can enhance adhesion.

Application Notes: KN-300N is a slow-drying adhesive. This slow-drying silicone adhesive is used for bonding silicone to silicone at room temperature. It is easy to apply and provides a strong bond. Products bonded with this adhesive have passed medical-grade safety certification.

Typical applications include various silicone seals, insulation of various electronic components, and miscellaneous silicone parts.

Safety Precautions: Wear gloves and goggles during application to avoid contact with skin and eyes.

Wear a respirator when using in poorly ventilated environments.

Storage Conditions: Store in a cool, dry place, away from direct sunlight and high temperatures (usually ≤30℃).

Single-component adhesives should be used as soon as possible after opening. Two-component adhesives must be mixed according to the specified ratio before use.

V. Advantages and Limitations

Advantages: Excellent waterproof performance, strong weather resistance, good elasticity, environmentally friendly and non-toxic.

Limitations: Long curing time (24-72 hours for single-component products), poor adhesion to some plastics (such as PP and PE), requires the use of a primer.