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TECHNICAL DATA SHEET
HEXAFLEX ELASTOMERIC COATINGS FOR WATER, FUEL AND CHEMICALLY RESISTANT TANK LININGS
DESCRIPTION AND USES
Hexaflex Elastomeric Coatings are tough, flexible, liquid-applied polysulfide polymers that can be applied to most common construction substrates. Hexaflex Coatings have excellent resistance to weathering and chemical attack, making them suitable for water and chemical tank lining where a long-lasting, durable finish is required. There are three grades available:
 Hexaflex "PW" for use in potable water environments |
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Hexaflex "ST" for lining sewage and effluent tanks
Hexaflex "FR" for fuel, oil and chemical vessels.
Hexaflex Coatings can be applied by hand with squeegees or by airless spray. Most substrates require to be primed with Hexaflex Primer No. 3 to provide a good key. Full cure is achieved in seven days.
Hexaflex "PW" Coating is approved for use with drinking water under the U.K. Water Bylaws Scheme (BS 6920 - Materials in Contact with Potable Water). It is currently exempt from approval by the D.W.I. under the Water Supply Act 1989, clause 26 1(b) ("materials which were in use with potable water prior to the Act")
USES INCLUDE:
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TECHNICAL DATA |
CHEMICAL RESISTANCE |
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Colour (mixed) Viscosity Specific gravity Mixing ratio by weight Working range Application time Min. curing temp Touch dry time Re-coatable time Fully cured Service temperature
Ultimate hardness Tensile strength Elongation at break Tear strength Compression set
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Black Pourable, spreadable liquid 1.4 4.9 to 1 Base to hardener + 5 to + 30ºC 2 hours at 21ºC ( # see note)+ 5ºC 4 hours at 21ºC 16 hours 7 days - 45 to + 135ºC (non aqueous) - 45 to + 80º C (aqueous immersed) 37º Shore "A" 1.8 MPa (260 psi) 430% 9.8 N/mm (56 lb/in) 2.5% at room temperature # Tropical grades have 2 hour worklife at 35º C |
Water Sewage Silage & slurries Oils Petrol Diesel Oil Acetone Lactic acid 25% Chlorine 5ppm Chlorine 40 ppm (2 weeks) Hydrochloric Acid >10% Methyl Ethyl Ketone Nitric Acid Dichloromethane Phosphoric Acid >25% Skydrol Sodium Hydroxide (conc.) Sulphuric Acid >40% Formic acid 75% |
+ + + + + + + + + + + + 0 0 0 + + + 0
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+ = Resistant 0 = Not resistant. All chemical resistance measured at 25°C
INSTRUCTIONS FOR USE
All surfaces to which Hexaflex Coatings are to be applied should be clean, dry and free from dust and loose particles. Concrete surfaces should be wire brushed or grit-blasted. Steel and other metal surfaces should be abraded or shot-blasted. Steel surfaces that are subject to continuous immersion in aqueous solutions will benefit from a coat of anti-corrosive primer before being coated with Hexaflex. Fresh galvanising will require pre-treatment with mordant solution or phosphoric acid etch primer. Hard, shiny surfaces such as vitreous enamel should be abraded.
Prime the prepared surfaces with one coat of Hexaflex Primer No. 3 and allow to become touch dry (45 min. to 1 hour). Mix 4.9 parts of Hexaflex Base with one part of Hardener (by weight) with a paddle mixer fitted to a slow speed drill until homogenous and free from streaks, (4 litre packs are pre-measured). Do not mix more than can be used in 2 hours. Small quantities can be mixed by hand with a spatula. Apply immediately by squeegee or brush. For airless spray application, thin the Base with 25% Methyl ethyl ketone before mixing in the Hardener and spray immediately.
Typical coating thicknesses of 500 microns are normally achieved with hand application and 250 - 300 microns by airless spraying at 10 to 30°C. The total recommended thickness for optimum performance is 1 mm however a minimum of two coats is required to give a continuous, pinhole-free surface. There is no maximum time window between multiple coats
Vessels, which may be attacked by the stored medium, e.g. concrete or steel tanks holding acids, may require extra coats to ensure continuity of the film. Metal vessels can be effectively checked for film continuity by spark testing.
QUANTITY ESTIMATION
500 microns 2 m²/litre
1000 microns 1 m²/litre
This data is provided in good faith for guidance purposes only, however due to variance in equipment and local conditions, users should carry out their own tests to ensure that satisfactory results can be obtained.
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