For fixing and insulating door and window frames, filling wall penetrations, and sealing plumbing cavities, RLA Foam Filler provides an expanding polyurethane barrier that seals out draft, noise, moisture, and dust. It adheres to common construction substrates including timber, brick, concrete, galvanised steel, aluminium, glass, compressed cement-sheet, and plasterboard.
RLA Foam Filler is a moisture-curing polyurethane foam that expands up to 45 times its original liquid volume to fill deep cavities and irregular gaps. As it expands, it conforms closely to the surrounding substrate to create an airtight, mould-proof, and water-resistant seal with a water absorption rating of only 1% by volume. Once fully cured, the beige foam can be cut, sanded, and painted to match the surrounding wall profile. The ozone-friendly propellant system contains no hazardous gases, and the delivery valve allows the canister to be reused after partial applications.
Ensure all surfaces are clean and free from loose material, dust, grease, and existing coatings. Remove structurally unsound layers mechanically. Lightly dampen the substrate with a water mist before application to accelerate the moisture-cure reaction and improve adhesion. Shake the can vigorously 15 to 20 times, screw the application tube onto the trigger valve, invert the can, and apply pressure to the trigger. Fill cavities to only one third of their total volume, allowing room for the foam to expand. Fill larger cavities in stages, allowing each layer to expand before applying the next.
Yes, once fully cured, foam can be cut, sanded, and painted. For outdoor use, painting or coating is essential to protect the foam from UV degradation and discolouration.
Only fill cavities to approximately one-third of the space. RLA Foam Filler expands significantly, up to 45 times its original size, so under-filling prevents excessive pressure that could distort window frames or other substrates.
Yes, RLA Foam Filler is moisture-cured. Lightly misting surfaces with water before application and lightly misting the applied foam can accelerate curing, especially in dry, low-humidity conditions.
For non-porous surfaces, wipe uncured foam immediately with a solvent-moistened cloth. If it gets on textiles, allow it to fully cure then remove mechanically by cutting or scraping.
| Application | Key benefit | Primary trades |
|---|---|---|
| Fixing and insulating door and window frames | Provides structural stability and an airtight seal, eliminating drafts and noise. Controlled expansion protects frames from distortion. | Builders, Carpenters, Joiners |
| Filling and sealing gaps, joints, and cavities | Expands up to 45 times to fill irregular voids completely, blocking dust and air movement. | All Trades |
| Sealing wall penetrations for services | Creates a fast, permanent seal around pipes and conduits to block pests and minimise draughts. | Plumbers, Electricians |
| Insulating electrical outlets and water pipes | Offers effective thermal insulation, improving energy efficiency and preventing condensation around services. | Electricians, Plumbers, Remedial Contractors |
Proper preparation is key to achieving maximum yield and adhesion. Ensure all surfaces are correctly prepared before starting.
Surfaces must be clean and free from all loose material, dust, oil, and grease. Cover and protect surrounding areas to prevent contact with the foam.
Ensure the can is at room temperature (at least 12 hours). Shake the can vigorously 15-20 times to thoroughly mix the contents before screwing on the application tube and trigger.
Apply the foam in a controlled manner to achieve a complete fill without causing damage from over-expansion.
Invert the can and direct the tube into the cavity. Apply steady pressure to the trigger. Fill the cavity to approximately one-third (33%) of the space to allow for expansion.
For larger or deeper cavities, apply the foam in stages or layers. This allows each layer to cure properly and ensures a consistent fill throughout the void.
Once the foam has cured, it can be finished to create a clean, professional appearance.
After approximately 8 hours, excess foam can be trimmed with a sharp knife. The surface can then be sanded smooth and painted to match the surrounding area.
RLA Foam Filler is an extremely flammable aerosol. Keep away from ignition sources. Do not pierce or burn cans.
Always wear protective gloves, overalls, and chemical goggles or a face shield. Respiratory protection is mandatory where ventilation is inadequate due to isocyanate content.
Use outdoors or in a well-ventilated area. If working indoors, ensure local exhaust ventilation is sufficient to maintain air concentrations below exposure standards.
Protect from sunlight and do not expose to temperatures exceeding 50°C. Store cans upright in a cool, dry place. Product has a shelf life of 12 months. Dispose of contents and container according to local regulations.
Proper surface preparation is crucial for optimal adhesion and performance across various building materials.
Surface prep: Ensure surfaces are clean, structurally sound, and free from dust, oil, grease, and loose material. Lightly dampen the substrate with a water mist immediately prior to foam application to improve adhesion and accelerate curing.
Primer: Not required. For standard applications on sound surfaces, proper cleaning and pre-dampening are sufficient for excellent adhesion.
Surface prep: Surfaces such as galvanised steel, aluminium, glass, and compressed cement sheet must be clean and free from contaminants. Lightly dampen the surface with a fine water spray to promote the moisture-curing reaction.
Primer: Not required. Adhesion to clean, non-porous surfaces is excellent without a primer. Ensure all oils or residues are thoroughly removed before pre-dampening and application.
| Property | Value |
|---|---|
| Base Chemistry | Polyurethane |
| Curing System | Moisture Cure |
| Colour | Beige |
| Density | 22 ± 3 kg/m³ |
| Compressive Strength | 0.03 MPa |
| Skin Time | 15-30 minutes (at 23°C/50% RH) |
| Open Time | 8 hours |
| Full Cure | 24 hours |
| Application Temperature | 5°C to 30°C |
| Service Temperature | -40°C to 80°C |
| Water Vapour Transmission | 1% volume |
| Coverage Rate | 30-45 Litres (expanded volume) |
| VOC Content | < 2 g/L |
| Packaging | 500ml can, Carton of 12 |
| Shelf Life | 12 months |
Here are some common examples on where RLA Foam Filler used by our customers.
