Fix & Fill Expanding Foam 750ml

Overview

Expanding Foam (B3 Fill n Fix) is a moisture-curing polyurethane foam supplied in handheld and gun-grade aerosol formats. It is intended for bonding, filling, sealing and insulating within building applications. Once cured, it forms a semi-rigid, predominantly closed-cell structure. The foam does not shrink during curing. It is resistant to ageing and operates within a stated temperature range when cured. It should not be left exposed to UV radiation and must be protected with a suitable covering layer.

The foam adheres to most typical construction materials including wood, concrete, stone, plaster, metal, PVC and polystyrene. It does not adhere to polyethylene, Teflon, silicone, oil, grease or similar substrates.

Intended Uses

The foam is intended for:

• Installation of window and door frames and entrance door linings where a controlled backfill is required.

• Filling of holes.

• Insulation of penetrations.

• Sealing of thermal and acoustic insulation boards.

• Sealing and connection of joints.

• Reducing the impact of thermal bridges.

Technical Characteristics

Performance data provided in the technical sheet includes curing times, tensile and compressive strength values, density, post-expansion, thermal conductivity, sound reduction, and foam yield. Values are stated for both dry and moistened surfaces where relevant. Performance characteristics were measured at 23°C and 50% relative humidity unless otherwise indicated. Environmental conditions such as temperature, moisture and substrate type may influence results.

The cured foam is described as semi-rigid and predominantly close-celled, with resistance to ageing. It withstands temperatures between -40°C and +90°C once cured. Fresh foam requires moisture to cure evenly and will expand approximately 1½ to 2 times.

Application Guidance

Preparation

Substrates must be firm, clean and free from dust, grease and contaminants that may hinder adhesion. Surfaces must be moistened before foam application. Users should ensure that all elements around the intended application area are properly prepared.

Ideal working temperature for both can and environment is +20°C. Cans stored at low temperature must be warmed in lukewarm water below +45°C and must never be heated above +50°C. Cans exposed to heat must be cooled before use. Adjacent surfaces should be protected with suitable coverings. The can must be shaken thoroughly at least 15–20 times before use.

Application – Handheld

The can should be held upright while attaching the applicator straw to the valve. For dispensing, the can is inverted and the applicator trigger controls the foam output.

Application – Gun Grade

The can must be attached to the gun while held upright. Over-tightening and incorrect orientation must be avoided. Once connected, the can is inverted to apply the foam. Flow rate is controlled using the gun trigger. Application must account for the foam’s expansion to avoid overfilling. Fresh foam should be removed within the tack-free time using the appropriate cleaner; cured foam must be removed mechanically.

Moisture is required for correct curing. Insufficient moistening or overfilling may result in uncontrolled post-expansion. Once opened, a can should be used within four weeks.

Cleaning

Excess uncured foam may be removed with Bond It FOAM CLEANER or Bond It MULTI-WIPES. Cured foam can only be removed mechanically.

Storage and Handling

The product is supplied in 500ml and 750ml aerosol containers. Containers are classed as extremely flammable and must be stored and transported upright in cool, dry conditions between +5°C and +30°C. Storage above +50°C must be avoided. The product contains a propellant compliant with EU regulations restricting CFCs.

Shelf life is 12 months in unopened containers stored according to manufacturer guidance.

Limitations

Cured foam is sensitive to UV light and must be covered with an opaque finishing layer. Lightweight construction components must be firmly fixed before foam application due to the product’s post-expansion behaviour.

Disposal

Containers must not be pierced. Waste material should be collected using inert absorbent material and disposed of in accordance with local regulations. Empty containers must not be left where residues could cause harm.