Elring Dirko HT Black - High-Temperature Liquid Gaske

Key Features and Specifications of Dirko HT Black

• Chemical Base and Curing:

  • Oxime-Silicone: Dirko HT Black is based on oxime silicone, ensuring a neutral curing process at room temperature. This chemical base prevents the formation of acidic by-products, making the product safe for use on sensitive metal surfaces without the risk of corrosion.
  • Single-Component: The sealant is a single-component product, meaning it can be used directly from the package without requiring a separate activator or hardener. This makes it easy and efficient to use.
  • Room Temperature Vulcanized (RTV): Dirko HT Black cures at room temperature through a reaction with moisture in the air, forming a durable, elastic seal.

• Temperature Resistance:

  • Range: Dirko HT Black is designed to perform effectively at temperatures ranging from -60°C to +285°C. It can withstand short-term peaks up to +315°C, making it ideal for use in high thermal stress environments, such as engines and exhaust systems.
  • Permanent Elasticity: The sealant retains its elasticity and adhesion even at extreme temperatures, which is crucial for maintaining a reliable seal under challenging conditions.

• Chemical Resistance:

  • Resistant to Various Media: Dirko HT Black resists a wide range of chemicals, including mineral oils, synthetic oils, greases, coolants, UV radiation, both hot and cold water, salt water, cleaning agents, weak acids, and bases. This extensive chemical resistance ensures the seal maintains its integrity even in aggressive environments such as engine compartments and industrial installations.

• Physical Properties:

  • Shore A Hardness: 40 ± 5 according to DIN 53505, which makes the sealant flexible yet firm enough for effective sealing.
  • Density: 1.18 ± 0.2 g/ml according to DIN 53479, providing a solid but elastic seal.
  • Elastic Modulus: 1.0 ± 0.2 N/mm² according to DIN EN ISO 8339, indicating that the sealant maintains significant elasticity even under high stress.
  • Elongation at Break: 400 ± 100% according to DIN 53504, showing that the sealant can accommodate significant expansion and contraction without tearing.
  • Tensile Strength: 3.3 ± 0.2 N/mm² according to DIN 53504, indicating strong adhesion.

• Media Resistance:

  • Durability Under Load: Tests have shown that Dirko HT Black maintains its elasticity and tensile strength even after exposure to extreme temperatures and aggressive media such as engine oil and water-glycol mixtures. At 285°C, the elongation at break remained significant after 1000 hours of exposure, demonstrating the sealant’s excellent durability under harsh conditions.

• Applications:

  • Automotive Applications: Dirko HT Black is ideal for sealing valve covers, oil pans, water and oil pumps, differentials, gearboxes, oil sumps, thermostat housings, and control housings. It is also suitable for seals in headlights, taillights, and battery housings, where waterproofing and chemical resistance are essential.
  • Industrial Applications: Beyond automotive uses, Dirko HT Black can be employed in a wide range of industrial applications, including sealing flange connections and other mechanical systems exposed to high temperatures and aggressive chemicals.

• Processing and Usage:

  • Application Temperature: The sealant can be applied at ambient temperatures between +5°C and +35°C. For optimal performance, the surfaces to be sealed should be clean, dry, and free from oil and grease.
  • Drying and Curing Time: Dirko HT Black forms a skin within 5 to 10 minutes at 23°C and 50% relative humidity. Full curing occurs in approximately 24 hours under the same conditions, with a curing rate of about 4.5 mm per day.
  • Application Instructions: The product should be applied evenly to the surface to be sealed. After application, parts can be assembled immediately or after the sealant has formed a skin, depending on application requirements.

• Storage and Shelf Life:

  • Optimal Storage Conditions: Dirko HT Black should be stored in a cool, dry environment at temperatures between +5°C and +25°C. Under these conditions, the product has a shelf life of at least 12 months in an unopened package.
  • Usage After Opening: After opening, the tube should be tightly sealed, and the product should be used as soon as possible to prevent premature curing.

• Packaging Options and Product Codes:

  • 70ml Tube (Product Code: 006.553): This compact packaging is ideal for smaller repairs and applications. The tube comes with a tube key and nozzle for precise application.
  • 200ml Compressed Gas Cartridge (Product Code: 471.501): This packaging is suitable for applications requiring a larger amount of product. The gas cartridge allows for easy and even application, especially on larger surfaces.
  • 310ml Cartridge (Product Code: 036.164): For industrial applications requiring large quantities of material, this larger cartridge provides the ideal solution. This packaging is designed for use with a sealant gun and is perfect for professionals performing regular sealing work.

Conclusion

Elring Dirko HT Black is a versatile and reliable liquid gasket designed for applications where high temperatures, chemical resistance, and durability are crucial. With its excellent physical and chemical properties, Dirko HT Black offers a high-quality sealing solution for both automotive and industrial applications. Whether for engines, transmissions, or other mechanical systems, Dirko HT Black is the ideal choice for professionals needing a product that performs under the toughest conditions. With various packaging options, including the 70ml tube, 200ml gas cartridge, and 310ml cartridge, Dirko HT Black is suitable for a wide range of applications, from small repairs to large industrial projects.