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Corrosion Preventing & Sealing
Our range of cold-applied, self-supporting mastics—including Denso Tape, Densoseal 16A, Densofil, and Densyl Mastic—are engineered to deliver exceptional sealing, contouring, and corrosion protection in demanding environments. Whether you're sealing cable ducts below ground, profiling complex pipe fittings, or preventing water and gas ingress around building entries, these products offer outstanding versatility and ease of application.
Designed for use across a variety of surfaces and climates, they ensure reliable performance without the need for heat or curing time. Ideal for utility, industrial, and infrastructure projects, our mastics are trusted solutions backed by proven quality and compliance.
Denso Tape
Denso Tape is a cold-applied, petrolatum-based tape designed for long-term corrosion protection of buried or exposed pipes, valves, and fittings. It remains flexible, non-hardening, and easy to apply in a wide range of temperatures.
Key Features:
- Synthetic fibre fabric coated with petrolatum
- Resists water, gases, acids, alkalis, and salts
- Non-cracking and conformable
- Easy application with 55% overlap
- Service temperature: -20°C to +55°C
- Application temperature: -5°C to +45°C
Specifications:
- Breakdown Voltage: 16kV (double layer)
- Total Thickness: 1.15 mm
- Weight: 1.44 kg/m²
- Roll Size: 10 meters (widths from 50 mm to 300 mm)
Densoseal 16A
Densoseal 16A is a non-setting, self-supporting mastic designed to seal cable ducts, conduits, and service entry pipes. Ideal for below-ground applications, it prevents the ingress of gas and water and adheres to various surfaces—even when wet.
Key Features:
- Non-setting, firm mastic based on polybutene
- Seals ducts and sleeves to block gas and water ingress
- Suitable for wet or dry surfaces
- Complies with British Telecom Spec M212C
- Service temperature: -15°C to +100°C
- Application temperature: 0°C to +35°C
Specifications:
- Colour: Yellow
- Specific Gravity: 1.43 - 1.73
- Specific Volume: 578 cm³/kg
- Supplied in cartons of 8 x 1kg blocks (330 mm x 40 mm x 40 mm)
Densofil
Densofil is a cold-applied, self-supporting mastic designed for shaping and profiling around irregular pipe fittings prior to tape application. It’s ideal for use in tropical climates and is formulated to resist slumping, even in deeply filled joints and valves.
Key Features:
- Petrolatum compound with polymer beads and flow control additives
- Used to create a smooth profile for applying Denso, Densopol, or Densoclad tapes
- Low-density and suitable for tropical conditions
- Resists sagging and slumping
- Service temperature: up to +75°C
- Application temperature: 0°C to +45°C
Specifications:
- Colour: Yellow/cream with white spheres
- Specific Gravity: 0.74
- Specific Volume: 1.35 l/kg
- Thermal Conductivity: 0.21 W/mK
- Sag Temperature: >85°C
- Supplied in cartons of 6 x 2 kg slabs
Densyl Mastic
Densyl Mastic is a cold-applied, VOC-free, self-supporting petrolatum-based mastic formulated with inert fillers and vegetable fibres. It is ideal for duct sealing and profiling around pipe and cable entries to prevent gas or water ingress and prepare surfaces for anti-corrosion tape application.
Key Features:
- 100% solids, VOC-free formulation
- Effective up to +90°C
- Moulds easily around irregular shapes
- Suitable for indoor and outdoor climates
- Commonly used with Denso, Densopol, and Densoclad tapes
- Application temperature: 0°C to +70°C
Specifications:
- Colour: Green/Brown
- Specific Gravity: 1.39
- Specific Volume: 720 cm³/kg
- Softening Point: +98°C to +100°C
- Volume Resistivity: 10¹³ Ω·cm
- Cone Penetration: 85 dmm
- Slump Resistance at 90°C: Pass
Need Help?
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