PPG SigmaTherm 540 Moisture Cure Silicone

UN1263 (Class: 3, Pk Grp: III)
Formally Amercoat 878 a one component heat resistant moisture curing silicone aluminium.
Available in 5 and 20 Litres in Aluminium 9000
From £204.55 £170.46
In stock
Only %1 left
Product Description

PPG SigmaTherm 540 is a one component heat resistant moisture curing silicone coating that produces a slick aluminium finish designed for protecting surfaces at extreme temperatures.

The clue is in the name for what this product actually does, as this extremely high performing product works to resist temperatures of up to and including 540°C.

Best Uses

SigmaTherm 540 can be used internally or externally in heavy industrial or construction environments and works to provide the ultimate protection to surfaces that could potentially suffer from heat damage. When used externally SigmaTherm 540 provides top resistance against weathering and offers a degree of UV light resistance with an aluminium finish.


SigmaTherm 540 should be applied using a spray gun to improve the appearance of the surface but can be applied using brush or roller for touch ups too. SigmaTherm 540 is dry to touch after just 45 minutes at 20°C and can be overcoated in 16 hours. Make sure you leave 3 days for the product to cure at 20°C before you expose the surface to heat, this is vital in ensuring the product has adhered to the surface properly and will perform properly.

Surface and Environment

SigmaTherm 540 can be used on a variety of metal substrates and is ideally suited for use on engines and steel exposed to high temperatures. this product is heat resistant of up to 540°C on steel and 400°C on rusted steel that has been cleaned with a power tool.

Technical Details


  • Heat resistant up to 540°C on steel, grit blasted to SSPC SP10/NACE 2
  • Heat resistant up to 400°C on rusted steel, power tools cleaned to ISO-St3
  • A minimum drying time of 3 days at 20°C should be allowed before exposure to heat

Technical Info

Components: Single Pack
Type: Heat Resistant
Finish: Eggshell
Stock Colours: Aluminium and Black
Tintable: No. 
VOC Content: 498.0 g/l
Volume Solids: 45 +/- 2%
Suitable Substrates: Steel
Application Method: Brush, Air Spray, Roller (for roller application the best results will be obtained by using fine foam type rollers)
Theoretical Coverage: 18.0 m2/' for 25 microns
Wet Film Thickness (WFT): -
Dry Film Thickness (DFT): 25 microns (1.0 mils)
Induction Time: -
Pot Life: -
Touch Dry: 45 minutes at 20°C
Overcoatable: After minimum 16 hours at 20°C
Fully Cured: -
Cleaner / Thinner: No thinner should be added. Clean tools with PPG Thinner 21-06
Shelf Life: At least 9 months when stored cool and dry
Packaging: Available in 5 and 20 Litres

The manufacturers data sheets are available for download from this website. It is your responsibility to read and understand all aspects of the data sheets before you place an order and prior to application. Please pay special attention to the preparation, mixing and application temperatures of the product, cleaning of substrate and environmental factors such as temperature, rain etc. Quoted coverage rates are based on the manufacturers theoretical rates and may vary depending upon substrates absorption, texture and application. We always recommend a test is carried out to ensure suitability.

Customer further agrees that Promain have no liability for any errors or omissions contained within the Product Data Sheets and are not liable for failure due to misapplication or inadequate substrate cleaning and preparation. For more information please refer to our Terms & Conditions.

Related Products