This product is part of the Network Rail Specification NR/L3/CIV/039. Highways Agency Item No.159. BBA Cert. no. 08/H135-PS11.
Hempel Hempadur 17940 is formulated as a sealer for Hempadur systems on aluminium / zinc metal sprayed substrate in atmospheric exposure.
It is recommended to overcoat spray-metallised surfaces as soon as possible to avoid possible contamination. Apply only on a dry and clean surface with a temperature above the dew point to avoid condensation. Use only where application and curing can proceed at temperatures above: 0°C/32°F. The temperature of the surface must also be above these limits. The temperature of the paint itself should be: 15-25°C/59-77°F. In confined spaces provide adequate ventilation during application and drying.
It is recommended to apply a mist coat of undiluted product, allow air to escape, and then apply a full coat of the product a few minutes later. Certain metal sprayed surfaces may be so porous that extra diluting can be necessary. Extra diluting up to: 20-30%. Except for mild climatic conditions avoid long-term exposure of zinc sprayed steel coated with a thin layer of paint only as this may create white rust under the paint. A completely clean surface is mandatory to ensure intercoat adhesion, especially at long overcoating intervals. Any dirt, oil, grease, and other foreign matter must be removed with suitable detergent followed by (high pressure) fresh water cleaning. Salts to be removed by fresh water hosing. Any degraded surface layer, as a result of a long exposure period, must be removed as well. To check whether the quality of the surface cleaning is adequate, a test patch may be relevant.
Use Hempadur 17940 on aluminium and zinc metal sprayed substrates and make sure that the surface is completely clean to ensure inter-coat adhesion especially at long recoating intervals.
|Type:||Polyamide Adduct Cured Epoxy|
|Stock Colours:||19880 Dark Alu|
|VOC Content:||616.0g per Litre|
|Suitable Substrates:||For aluminium and zinc metal surfaces|
|Application Method:||Brush or Airless Spray|
|Theoretical Coverage:||15.2 m2 per litre|
|Wet Film Thickness (WFT):||75 microns|
|Dry Film Thickness (DFT):||25 microns|
|Pot Life:||4 hours at 20°C|
|Touch Dry:||1 hour at 20°C|
|Overcoatable:||Dependant on Specification|
|Fully Cured:||7 days at 20°C|
|Cleaner / Thinner:||Hempel Thinner 08450 (5%)|
|Shelf Life:||6 months for BASE and 2 years (25°C/77°F) for CURING AGENT from time of production. Depending on storage conditions, mechanical stirring may be necessary before usage.|
|Packaging:||Available in 15 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.