Zincalume and Colorsteel
Bitufoam has zero carbon black content,
while Ecofoam has less than 0.065% of carbon black by weight.
Both products are suitable for use with Zincalume, Colorsteel
and Colorcote products.
Exposure testing and work carried out by
CSIRO in Australia has shown that satisfactory performance
and compatibility with Zincalume and Colorsteel can be achieved
by washers and sealing materials that are free of or contain
low levels of carbon black. This is providing that the carbon
black does not lead to significant electrical conductivity
of the washer or sealing material.
Further recommendations were made based
on test data determined by CSIRO on the electrical resistance
and potential of materials with different carbon contents.
The manufacturer of Zincalume and Colorsteel,
BHP, has recommended that: Whether used as a washer, sealing
filler stip, or weather seal, rubber based sealing materials
in contact with either Zincalume or Colorsteel G2z product
must not have carbon black fillers levels of more than 15%
by volume or 25% by weight.
Ecofoam is manufactured from crosslinked
polyethylene foam and our suppliers have advised the carbon
black contained in it is less than 0.065% by weight, compared
to the maximum allowed of 25%.