Description
BACKING RODS are flexible, closed-cell polyethylene foam cords used as bond breakers and joint filler materials in construction joints. They help control the depth of sealant, ensuring correct joint geometry and providing a firm backing to support the sealant during application. Backing Rods also prevent three-sided adhesion, improve sealant performance, and reduce material consumption. Ideal for expansion joints, movement joints, glazing applications, and sealing works in concrete, masonry, metal, and façade systems.
Available Sizes
• 6 mm
• 8 mm
• 10 mm
• 12 mm
• 15 mm
• 20 mm
• 25 mm
• 30 mm
Stock Status
In Stock
Product Highlights
- Closed-cell polyethylene foam for superior water resistance
- Prevents three-sided adhesion for optimal sealant movement
- Provides consistent joint depth control for sealant application
- Reduces sealant consumption and increases efficiency
- Flexible and compressible for easy installation
- Chemically inert and compatible with most sealants
- Non-absorbent and does not react with joint sealants
- Ideal for both interior and exterior expansion joints
Technical Specifications
| Property | Specification |
|---|---|
| Material | Closed-cell polyethylene foam |
| Density | 25–35 kg/m³ (typical) |
| Compression Range | 30% – 50% of rod diameter |
| Water Absorption | Less than 1% |
| Temperature Resistance | -40°C to +80°C |
| Chemical Resistance | Resistant to oils, solvents, and most chemicals |
| UV Resistance | Good (protected once covered by sealant) |
| Colour | Grey or black (depending on batch) |
| Shelf Life | 24 months (stored dry and shaded) |
| Storage Conditions | Store in cool, dry, shaded areas away from direct sunlight |
Application Instructions
- Surface Preparation:
- Clean the joint area thoroughly and remove any loose particles.
- Ensure the surface is dry before inserting the rod.
- Installation:
- Select a rod diameter 25–50% larger than joint width.
- Press the rod to the required depth using approved tools.
- Ensure the rod remains undamaged and uniformly compressed.
- Note: Do not puncture or cut the rod, as this may lead to air release and sealant failure.
Coverage Calculator
- 1 meter of joint requires approximately 1 meter of backing rod.
- Choose rod size based on joint width for correct compression ratio.
Suitable Applications
- Expansion and movement joints
- Structural and façade joints
- Window and door perimeter joints
- Glazing and aluminum systems
- Horizontal and vertical joint sealing
Compatibility & Limitations
- Compatible with polyurethane, acrylic, polysulfide, and silicone sealants.
- Not suitable for bituminous sealants.
- Do not use in submerged or waterlogged joints.
Safety & Handling
- Non-toxic, non-irritant, and environmentally safe.
- Store away from sharp objects to avoid puncture.
- Wear gloves when installing in deep joints for safety.
Frequently Asked Questions
They control joint depth and prevent three-sided adhesion in sealant applications.
Yes, they are closed-cell and do not absorb water.
Yes, they are suitable for both interior and exterior applications.
No, they are chemically inert.
Polyurethane, silicone, acrylic, and polysulfide sealants.
Select a rod 25–50% larger than the joint width.
No, they are not suitable for continuously submerged conditions.
Yes, they significantly reduce the amount of sealant needed.
Cutting is not recommended, as it may cause failure due to air release.
24 months when stored properly away from sunlight.
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