PPG SigmaTherm 350 Heat Resistant

UN1263 (Class: 3, Pk Grp: III)
Formally Amercoat 891. Heat resistant silicone/acrylic finish - heat resistant up to 350°C.
Available in 20 Litres
From £734.84 £612.37
In stock
Only %1 left
Product Description

PPG SigmaTherm 350 is ideal for providing a heat resistant coating to internal and external steel surfaces with resistance of up to 350°C. SigmaTherm 350 is available in a silicon/acrylic finish that can be used over all inorganic zinc primers.

Best Uses

PPG SigmaTherm 350 is best used for providing protection to metal substrates that reach surface temperatures of up to 350°C. SigmaTherm 350 is ideal for use in heavy industrial and construction environments internally and externally and offers excellent weathering protection to prevent corrosion.


SigmaTherm 350 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. PPG SigmaTherm 350 is dry to touch after just 1-2 hours at low temperatures and can be overcoated in 18 hours. Make sure you leave 3 full 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

PPG SigmaTherm 350 is available in white or aluminium finish to not only provide protection but offer an aesthetically pleasing decorative coating to all metal surfaces that require protection from heat.

Technical Details


  • Heat resistant up to 350°C

Technical Info

Components: Two Components
Type: Heat resistant silicone/acrylic finish
Finish: Semi Gloss
Stock Colours: RAL 9006 White Aluminium, RAL 9011 Graphite Black
Tintable: No
VOC Content: White = 590.0 g/l, Alluminium = 540.0 g/l
Volume Solids: White = 39 +/- 2%, Aluminium = 42 +/- 2%
Suitable Substrates: Steel
Application Method: Air Spray, Airless Spray (Brush/roller should only be used for touch up and spot repair)
Theoretical Coverage: White: 15.3m2/l for 25 microns. Aluminium 16.8 M2/l for 25 microns
Wet Film Thickness (WFT): -
Dry Film Thickness (DFT): 25 - 30 microns (1.0 - 1.2 mils)
Induction Time: -
Pot Life: -
Touch Dry: 1 hour at 20°C
Overcoatable: After minimum 18 hours hours at 20°C
Fully Cured: days at 20°C
Cleaner / Thinner: No thinner should be added. Clean tools with Thinner 21-06
Shelf Life: At least 24 months when stored cool and dry
Packaging: Available in 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.

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