Sherwin Williams Heat-Flex M505 - Formerly Leighs

UN1263 (Class: 3, Pk Grp: III)
A heat resisting, matt, air drying silicone resin based coating for steel surfaces.
Available in 5 and 20 Litres
From £199.78 £166.48
In stock
Only %1 left
Product Description

Sherwin Williams Heat-Flex M505 - Formerly Leighs is a heat resisting, matt, air drying silicone resin based coating for steel surfaces.

Best Uses

Sherwin Williams Heat-Flex M505 is suitable for application on to steel surfaces previously coated with Zinc Clad II EU or zinc or aluminium metal spray, where heat resistance is required.

Maximum Surface Temperatures:

  • WHITE - No discolouration at 250°C, Slight discolouration at 350°C
  • BLACK - No discolouration at 250°C, Slight discolouration at 350°C
  • ALUMINIUM - No discolouration at 600°C. Zinc silicate or zinc metal spray should not be used above 400°C, use aluminium metal spray


Recommended application is via airless spray, conventional spray or brush using cleanser no2. Recommended primer Zinc Clad II EU (up to 400°C). Topcoat not normally required, but indefinitely overcoatable with itself. Ensure surfaces to be coated are clean, dry and free from all visible traces of surface contamination. Any contamination of metal spray will prevent the M505 film penetrating and sealing, leaving it sitting on top and prone to blowing off.

M505 is not designed to provide anti-corrosive protection, but it is possible to apply the product in 2 coats directly onto blast cleaned steel to Sa2½ BS EN ISO 8501-1:2007 (average surface profile in the range of 50-75 microns ) provided it is put into service quickly and kept at elevated temperatures. Steelwork coated with M505 should not be exposed to moisture prior to putting into service. Over-application of M505 must be avoided. If the recommended film thickness is exceeded, adhesion may be reduced especially when exposed to high temperatures.

Technical Details
Components: Single Pack
Type: Silicone resin based coating
Finish: Matt
Stock Colours: White, Black, Aluminium
Tintable: No
VOC Content: 600 gms/litre
Volume Solids: 31 ± 2%
Suitable Substrates: Steel
Application Method: Brush, Airless Spray or Conventional Spray
Theoretical Coverage: 12.3 m2/ltr
Wet Film Thickness (WFT): 81 microns
Dry Film Thickness (DFT): 25 microns
Induction Time: -
Pot Life: -
Touch Dry: 1½ hours at 15°C
Overcoatable: 6 hours at 15°C
To Handle: 24 hours at 15°C
Cleaner / Thinner: Cleanser No.2
Shelf Life: 2 years from date of production unopened or 'use by' date where specified
Packaging: Available in 5 Litres 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.

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