PPG SigmaTherm 538 is a single component, heat resistant, moisture curing (ethyl), silicate finish designed for providing heat resistance to metal substrates situated internally or externally.
PPG SigmaTherm 538 is best used in conjunction with zinc silicate heat resistant primers to form the ultimate bond between primer and topcoat. When this bond is achieved, your surface coating will be able to withstand temperatures of up to and including 520 degrees Celsius dry heat.
PPG SigmaTherm 538 should be applied using air or airless spray and the use of a brush or roller should only be used for touch ups and small tricky areas that require more precision that a spray gun can produce. PPG SigmaTherm 538 is fast drying at just 1 hour to touch before reaching full cure after 12 hours.
Surface and Environment
PPG SigmaTherm 538 can be applied to most metal substrates that have been previously primed with a suitable primer made up of zinc silicate. PPG SigmaTherm 538 works well under atmospheric conditions and can protect heat damage on a variety of different appliances including, bbq
- SigmaTherm 538
- A single pack heat resistant moisture curing (ethyl) silicate finish.
- Theoretical spreading rate of 5.0m2 per litre for 125µm
- Touch dry in 1 hour, full cure after 12 hours
- Recommended Thinner 21-06