RTV Silicone Sealant 9239 300ml

Product Description

9239 is a single-component, room-temperature vulcanizing (RTV) silicone adhesive with excellent thermal conductivity, flame resistance, and durability. Ideal for electronic component bonding, gap filling, and PCBA protection

Kootai 9239 RTV Silicone is a one-component thermal adhesive designed for effective electronic encapsulation and bonding. It cures at room temperature by reacting with moisture in the air, forming a durable, elastic silicone layer. With a high thermal conductivity (0.5 W/mK), electrical insulation (14 kV/mm), and flame retardance meeting UL94 standards, 9239 delivers a robust solution for electronics requiring heat dissipation and environmental protection. It adheres well to metals, plastics, ceramics, and various substrates, making it versatile for industrial applications. The product complies with EU RoHS, REACH, and UL directives, and is halogen- and sulfur-free, ensuring regulatory compliance.

Unique Selling Propositions (USP)

Kootai 9239 is a high-performance RTV silicone adhesive designed for electronics and industrial thermal management applications. It delivers multi-functional performance by acting as a bonding agent, thermal conductor, sealant, and insulator, all in a single formulation. This one-component adhesive cures at room temperature, eliminating the need for external curing equipment. Its non-corrosive, halogen-free, and UL94 flame-retardant formulation makes it a preferred choice for PCBA, LED modules, and high-reliability electronics across industries.

Key Features & Advantages

• One-Component System: No mixing required. Ready to use straight from the cartridge.
• Thermal Conductive: Effectively transfers heat away from critical components ( 0.5 W/mK).
• Fast Skin Formation: Surface dries in just 512 minutes at 25C, ensuring faster processing.
• Excellent Adhesion: Bonds strongly to metals, plastics, ceramics, glass, and PCBA materials.
• Flame Retardant: UL94-rated for added safety in high-temperature applications.
• Electrical Insulation: Dielectric strength 14 kV/mm for circuit protection.
• High Mechanical Strength: Hardness of Shore A 555 and tensile strength 2.3 MPa.
• Elongation at Break 100% Withstands vibration, expansion, and contraction.
• Low Volatility: Fugitive content 2.2%, with no shrinkage or cracking.
• RoHS, REACH & UL Certified: Meets global safety and environmental compliance.

Typical Industrial Applications

• LED Lighting Systems:Bonding LED modules to aluminum bases or heat sinks for efficient heat dissipation.
• PCBA Assembly & Protection:Used for gap filling, component reinforcement, and three-proofing (moisture-proof, dust-proof, anti-vibration) of printed circuit boards.
• Power Electronics & Adapters:Ideal for thermal bonding of heat-sensitive parts in power supply units and transformers.
• Automotive Electronics:Applied in EV battery modules, sensors, and control boards for shock resistance and thermal regulation.
• Communication Equipment & Industrial Controls:Provides insulation, bonding, and protection against harsh environmental conditions.

Technical Overview

Kootai 9239 RTV Silicone is a single-component, room temperature curing adhesive that forms a durable, flexible bond with excellent thermal conductivity and electrical insulation. It is specifically engineered for demanding industrial and electronic applications where performance, safety, and reliability are critical.

Key technical highlights include:

• The adhesive appears as a white, semi-paste that is easy to apply and spreads uniformly over surfaces.
• It skin-forms within 5 to 12 minutes at 25C and 50% relative humidity, making it suitable for fast-paced assembly lines.
• A full cure is achieved in 24 hours, reaching a depth of 23 mm under normal ambient conditions.
• It maintains a solid yet flexible structure with a Shore A hardness of 55 5, offering both rigidity and shock absorption.
• Designed for thermal management, it delivers thermal conductivity of 0.5 W/mK, ensuring effective heat dissipation from sensitive components.
• With a tensile strength of 2.3 MPa, it forms strong mechanical bonds even in vibration-prone environments.
• The material can stretch without cracking, thanks to an elongation at break of 100%.
• For electrical applications, it provides robust insulation with a dielectric strength of 14 kV/mm and a volume resistivity of 3 10 cm.
• It is a low-volatile adhesive, containing less than 2.2% fugitive content, minimizing shrinkage and odor.
• Complies with UL94 flame retardancy, and is certified under RoHS, REACH, and is halogen- and sulfur-free, making it safe for global electronic manufacturing standards.

This technical combination ensures that Kootai 9239 can perform reliably in environments exposed to heat, moisture, dust, and electrical stressmaking it a preferred adhesive for advanced electronics, LED systems, and industrial automation applications.

FAQs

Q1: How long does 9239 RTV Silicone take to cure?

A: Surface curing begins within minutes, and deep curing occurs within 24 hours at 25C and 50% humidity. Full mechanical properties are reached after 7 days.

Q2: Can it be used on plastic surfaces like PP or PE?

A: Yes, but such surfaces require special pretreatment for effective adhesion.

Q3: Is it electrically insulating?

A: Yes, with a dielectric strength of 14 kV/mm and a volume resistivity 310 cm.

Q4: What is the shelf life?

A: 6 months when stored sealed in a cool, dry place (5C28C), though optimal performance is achieved within 4 months.

Q5: Is 9239 considered hazardous for transport?

A: No, it's classified as non-dangerous goods and can be stored and transported as general chemicals.