BMW X3 Service & Repair Manual: Installing a cavity sealing with 2-component pu cavity foam

SOURCING REFERENCE for cavity foam HS1.

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 tin-plating) 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 sealing is fully completed.

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 HS1:

• 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 process: 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 far 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 spray can after the expiry date has passed. After the Use by date the properties of the cavity foam will no longer meet the requirements of the BMW Group.

• Cavity preservation of the repair area possible after an air drying time of 1 hour.
• Surface must be clean, free of dust, grease, oil and separating agents .
• Application temperature at least 15 ºC. Optimally 20 ºC.

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.
• The setting takes approx. 30 minutes. Mechanical processing (e.g. drilling, cutting, etc.) is then possible
• Cavity preservation of the repair area possible after an air drying time of 1 hour.
• Remove fresh, non-hardened polyurethane foam with adhesive remover 208.

  Sourcing reference: BMW Parts Department.

  Hardened polyurethane foam can only be removed mechanically.

• Excess hardened polyurethane foam can be disposed of as residual waste.

  Cans that are not entirely empty or are unused and have an expired expiry date are classed as hazardous waste.

  Observe country-specific waste disposal regulations.

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