41 00 ... Installing A Cavity Sealing With 2-Component PU Cavity Foam

41 00 ... Installing a cavity sealing with 2-component PU cavity foam

Sourcing reference for cavity foam (refer to BMW Parts Department).

IMPORTANT: The cavity foam may only be use for cavity sealing at the points at which cavity sealing is present as standard.

The following repair represents the replacement of a shaped part for the cavity sealing by the use of cavity foam.
This type of cavity sealing is used at points at which shaped parts cannot be used for repairs.
This is the case when large amounts of heat occur (e.g. due to welding, soldering or tinplating) in the direct vicinity or at the point of the standard cavity sealing.
It is not possible here to install shaped parts for the cavity sealing because of the fire risk.
To replace shaped parts with cavity foam at further locations, adopt the procedure shown here and adapt it to the relevant ratios.
It must be ensured that the cavity is completely sealed off.

NOTE: Check the accessibility for the spraying pipe of the cavity foam to the affected cavity after removing the defective parts.

Properties of cavity foam:
- 2-component PU foam, solvent-free.
- Excellent flow capacity, enabling complete sealing of cavities.
- Good strength, preventing slipping in cavities.
- Low water absorption, preventing corrosion.
- Ideal for use as insulating and sealing compound.

Information on dangers/hazards:
- Avoid eye and skin contact.
Wear eye protection, solvent-resistant protective gloves and protective clothing.

- Do not inhale.
Apply in well ventilated rooms only.

- WARNING: Application time after mixing: within 8 minutes.

Completely empty open can after use.

- Residual amounts which are not used can cause the can to explode on account of a chemical reaction (buildup of heat).
Alternatively, cool the can containing the non-removed residual amount for several hours in cold water.

- Do not eat, drink or smoke while working with these products.
- Keep heat and ignition sources well away.
- Read the manufacturer's information on hazards/dangers (printed on the can) prior to application.

Processing instructions:
- Observe the expiry date on the cartridge.
Do not use the spray can after the expiry date on the can has expired. After the Use by date the properties of the cavity foam will no longer meet the requirements of the BMW Group.

- Cavity sealing of repair area possible after an air drying time of 1 hour.
- Backing surface must be
clean and free from dust, grease, oil and stripping agent.

- Application temperature at least 15 °C. Optimally 20 °C.

- IMPORTANT: Foam expands many times over as it sets (change in volume).

- Before applying to the vehicle, fill a clearly visible cavity of corresponding size with foam on a used part.
This enables an optimal dosage (i.e. spraying time) to be specified for filling the cavity on the vehicle with foam.

- Tape off open passages to visible areas with adhesive tape to prevent foam from escaping.
- Setting takes approx. 30 minutes. Mechanical processing (e.g. drilling, cutting, etc.) is then possible.
- Cavity sealing of repair area possible after an air drying time of 1 hour.
- Remove fresh, non-hardened PU foam with adhesive cleaner 208.
Sourcing reference: BMW Parts Department.
Hardened PU foam can only be removed by mechanical means (machine).

- Excess, hardened PU foam can be disposed of as residual waste.
Cans which are not entirely empty and unused whose expiry date has expired are classed as hazardous waste.
Observe country-specific waste disposal regulations.

- Observe the manufacturer's processing instructions (printed on the can).