Installing A Cavity Sealing With 2-Component PU Cavity Foam (M3 Base, M3 Competition, M3 Competition M xDrive, M3 CS)

SOURCING REFERENCE for cavity foam HS1 (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 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 enables complete seal 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 hand protection and protective clothing
Do not inhale
Apply in well ventilated rooms only

WARNING: Processing 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 sealant 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°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 leaking
The setting takes approx. 30 minutes. Mechanical processing (e.g. drilling, cutting, etc.) is then possible
Cavity sealant 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)

SOURCING REFERENCE for cavity foam HS3 (refer to BMW Group parts sales)

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