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Würth DP 300 Engine and Housing Sealing Compound

Würth DP 300 Engine and Housing Sealing Compound

0890100048

24 in stock

Key Features

  • Permanently plastic, non-hardening sealing compound for engines and housings with exceptional temperature, chemical, and mechanical resistance.
  • Maintains long-term sealing flexibility - will not harden, crack, or become brittle, even after years of vibration and thermal stress.
  • Excellent adhesion and sealing stability on both smooth and rough surfaces without pulling into threads during application.
  • Non-sagging formulation ensures consistent application on vertical and downward-facing surfaces.
  • High temperature resistance: -50°C to 270°C, with short-term peaks up to 300°C.
  • Chemically inert - does not bond to metals or plastics and prevents atmospheric corrosion.
  • Resistant to water, air, oils, fuels, coolants, lubricants, antifreeze, and fluorocarbon refrigerants.
  • Isocyanate-free and non-toxic, ensuring safe handling and environmental compatibility.
  • NSF registered (Category P1, Reg. No. 151822) - approved for use in areas with incidental food contact.
  • Approved by major automotive manufacturers and the Federal Office of Defence Technology and Procurement. 
£15.99 GBP
£15.99 GBP
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Product Product subtotal Quantity Price Product subtotal
Würth DP 300 Engine and Housing Sealing Compound
Würth DP 300 Engine and Housing Sealing Compound0890100048
Würth DP 300 Engine and Housing Sealing Compound0890100048
£15.99/ea 		£0.00
£15.99/ea £0.00

Description

High-Performance, Permanently Plastic Sealing Compound

Würth DP 300 Engine and Housing Sealing Compound is a non-hardening polyurethane-based sealant engineered for use in high-demand sealing applications. Its permanently plastic properties ensure long-lasting flexibility and leak-free performance, even under extreme temperature fluctuations, vibration, and exposure to aggressive fluids.

Outstanding Thermal and Chemical Resistance

This compound maintains its sealing integrity between -50°C and 270°C, and tolerates brief thermal peaks up to 300°C. Its unique formulation resists water, air, petrol, kerosene, synthetic and mineral oils, antifreeze mixtures, fluorocarbon refrigerants, and methanol-based coolants, making it suitable for critical environments in engines, turbines, and industrial machinery.

Permanently Plastic and Non-Hardening

Unlike conventional silicone or anaerobic sealants, Würth DP 300 remains plastic and elastic, providing a reliable seal without becoming brittle or losing adhesion over time. It compensates for expansion and contraction of metal and plastic surfaces caused by heat cycles, ensuring consistent sealing performance.

Exceptional Workability and Application Control

The compound's thixotropic consistency prevents dripping or sagging, even when applied on vertical or inverted surfaces. It also does not pull into threads, enabling precise sealing without obstructing screw connections. Application is smooth, clean, and predictable, providing professional results across a range of materials.

Corrosion Protection and Material Compatibility

The non-reactive polyurethane base provides a physical, non-chemical seal, preventing corrosion by excluding moisture and air. It does not bond permanently to metal or plastic surfaces, allowing easy disassembly and maintenance while maintaining full sealing integrity.

Certified for Industrial and Food-Safe Use

Würth DP 300 carries NSF P1 registration (Reg. No. 151822) for use in environments where incidental contact with food products is possible. It is also approved by leading automotive manufacturers and by the Federal Office of Defence Technology and Procurement, confirming its reliability for professional and industrial applications.

More Information

Application Instructions

  1. Ensure the substrate is load-bearing, clean, dry, and free of grease, rust, and water.
  2. Apply the compound evenly to one of the joining surfaces using an appropriate applicator or brush.
  3. Assemble the components directly after application; the sealant will adapt to irregularities and fill all gaps.
  4. Allow the sealed joint to rest before exposing it to pressure or heat.
  5. For best results, refer to the technical data sheet for application thickness and curing guidelines.

Usage Notes

  • Not suitable for sealing oil pans.
  • Ensure adequate ventilation during application.
  • Avoid prolonged skin contact; follow standard safety and handling precautions.
  • Store at room temperature in a dry place; avoid exposure to direct sunlight or frost.

Specifications

Chemical Basis: Polyurethane

Colour: Red

Contents: 89.6 g

Density: 1.12 g/cm³ (at 25 °C)

Maximum Pressure: 10 bar

Temperature Resistance: -50 °C to +270 °C (short-term up to +300 °C)

Flashing Point: -5 °C

Thermal Conductivity: Low (poor heat transfer for thermal stability)

Curing Behaviour: Permanently plastic, non-hardening

Adhesion: Excellent on metal, plastic, glass, and ceramic

Silicone-Free: Yes

Isocyanate-Free: Yes

Toxicity: Non-toxic

Corrosion Protection: Yes (prevents atmospheric corrosion)

NSF Registration: Category P1, Reg. No. 151822

Shelf Life: 12 months (stored at room temperature)

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