HEMPADUR 35560High performance solvent-free potable water tank coating meets the latest legislative requirements

Stripe coating application of HEMPADUR 35560 in a ship potable water tank.

Final airless spray appearance of HEMPADUR 35560 applied in a ship potable water tank.

How to read the Radargram• The Hempel Radargram mapping tool provides customers with a considerable amount of crucial information about

epoxy coatings in a straightforward, easy-to-understand form. The Radargram displays a range of important quantitative and qualitative product performance criteria.

• The Radargram uses a scale from 0 to 10, with 10 as the highest score. An average score of around 4 should be the minimum for an epoxy coating, unless the product has specially designed features. These are difficult to show in a Radargram, which makes general comparisons between all types of epoxy coatings.

• The Radargram is intended as an overall indication of the characteristics and capabilities of the product. The left side of the Radargram provides an indication of the general performance properties – the main focus for the end-user / owner. The right side gives an indication of the application properties, which are of prime interest for the applicator.

• A blue Radargram indicates that the product is intended for both submerged and dry areas.• Read more about the Radargram in the Hempel Epoxy Encyclopaedia, in the Hempel Radargram Illustrator or at

www.hempel.com.

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A newly coated potable water tank on board a ship.

Hempel’s HEMPADUR 35560 HEMPADUR 35560 is a 100% solvent-free, two-component, high-build, polyamine adduct cured epoxy paint specifically developed for long term protection of concrete and steel potable water tanks. The product is designed for use at both newbuilding and maintenance of existing potable water tanks. The product contains no solvents, benzyl alcohol or nonyl phenol that can

influence taste or smell. This means that quality water is maintained that way.

HEMPADUR 35560 is approved by the Water Research Centre (WRAS), Great Britain, according to BS 6920 for potable water up to 23°C/73°F. It is also covered by the Norwegian Health Authorities (Folkehelseinstituttet), Norway, for use in tanks for potable water offshore according to system 3A in NORSOK M-501, revision 5.

Potable water coatingsWater of sufficient quality to serve as drinking water is termed potable water whether it is used as such or not. The potable water coating should not contaminate or affect the quality of the drinking water. In particular the smell or taste of water should not be affected by the coating. A suitable coating for potable water tanks should last with minimal maintenance for up to 25 years without problems of corrosion or reduction of water quality.

Coatings applied to potable water tanks are usually two-component pure epoxies, either solvent-free (100% solids) or solvent-borne. Before accepting a coating to be used in potable water tanks, classification

societies require certification from a recognized laboratory that the coating is suitable for prolonged contact with drinking water. There are usually no significant differences between solvent-borne and solvent-free epoxy coatings during laboratory testing, but solvent entrapment may play an important role under field conditions. If ventilation is not carefully monitored during drying the solvents in solvent-borne potable water coatings can become retained in the coating affecting water taste and smell. Ideally solvent-free coatings are better suited for potable water tanks than those containing solvents. Most solvent-free coatings are difficult to apply with ordinary airless spray equipment, however HEMPADUR 35560 is formulated to overcome such difficulty.

Application propertiesHEMPADUR 35560 can easily be applied with single feed airless spray 45:1 or 60:1, without the need for any thinning or heating. HEMPADUR 35560 can be applied and cure down to 10°C/50°F. When mixed (mixing ratio A:B = 7:2 by volume) the product has a 1.5 hour potlife at 20°C/68°F.

The normal application range for HEMPADUR 35560 is 200-400 µm/ 8-16 mils dry film thickness (dft) and a typical paint specification is 2 coats of 200 µm dft. First coat is light red / shade 50900 and second coat is cream / shade 20320. Application is typically done by stripe coating “blind” areas, then apply first coat, stripe coating of hand welds, edges, back sides, corners etc., before application of the second coat. At 20°C/68°F recoating time between first and second coat is 24 hours. After full application of HEMPADUR 35560 in a potable water tank, the

coating will need 12 days curing at 20°C/68°F to obtain complete curing, before cleaning and being put into service.

PRODUCT FEATURES AND BENEFITS• Certified and approved for potable water use • 100% Solvent-free and Benzyl alcohol free• Resistance against bacterial growth • Easy cleaning • Excellent corrosion resistance • Application friendly • Long overcoating window • Light colour for easy inspection

HEMPADUR 35560 is tailor-made and approved for safe potable water storage in tanks

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The Hempel Group Head Office

Hempel A/S Lundtoftevej 150DK-2800 Kgs. LyngbyDenmark

Phone: +45 45 93 38 00Fax: +45 45 88 55 18E-mail: protective@dk.hempel.comE-mail: marine@dk.hempel.comwww.hempel.com