Compatibility with Non-Metallic Substances
Timber is generally acidic, although some timbers—such as cedar—are more acidic than others. The interaction between preservative treated timber and metal depends on the moisture content of the timber, the time of wetness and the type of treatment. The corrosion rates of metal in contact with wet CCA-treated timber and with untreated radiata are similar.
Butyl Rubber in Wet Contact with Cladding

Butyl rubber in wet contact with coated aluminium and steel has been found to accelerate corrosion.
Clause:
004_009_003_000_000_000_000_000_000
Clause Number:
4.9.3
/cop/durability/compatibility#compatibility-non-metallic-substances
Revision Category:
3 - Substantial change to recommendation
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