Franklin Hodge Industries standard range of water storage tanks is fitted with tailor made liners in either butyl rubber or EPDM material. Both materials are flexible synthetic membranes, ideal for lining water tanks and have similar properties.
WRAS Drinking Water Approval
For the storage of potable or drinking water, we offer a special grade of butyl rubber which has been tested to BS6920 and is approved under the UK Water Regulations Advisory Scheme for use in contact with potable water.
Butyl rubber and EPDM sheeting provides a completely waterproof seal and, with its closely packed molecular structure, is extremely resistant to the transmission of liquids or vapour.
Because both butyl rubber and EPDM contain no plasticisers or additives that can evaporate or leach over time, weather resistant properties of the two materials is excellent, with strength and elasticity remaining virtually unchanged over many years, despite exposure to sunlight, ultraviolet radiation and ozone.
Temperatures ranging from -30°C to +120°C (60°C maximum for prolonged periods) will not affect Butyl Rubber or EPDM material. If storing water at temperatures above ambient, we recommend that as a precaution, you contact our office for more information.
Water retaining properties of both Butyl Rubber and EPDM will not be affected even when the materials are stretched up to 300% of normal size.
For use as tank lining materials, both Butyl rubber and EPDM have excellent resistance to abrasive wear, tearing, flex cracking and puncturing. If there is a slight foundation subsidence and should there be small surface irregularities present in a tank both membrane materials will adapt without failing. Polyester matting underlay material, installed between the tank shell and the foundation or tank wall, is available for extra protection against puncturing in such situations. Very sharp objects and blows by sharp instruments may damage tank liners and we recommend that, as a precaution, clean rubber soled footwear is worn during internal tank installations or inspections.
Water Treatment & Chemical Resistance
With respect to the use of Chlorine for water tank treatment, we confirm that sterilisatiion to BS6700 is acceptable.
Ease of Repair
In the unlikely event that the internal tank membrane liner is punctured, it can easily be repaired with minimal disruption usually by a heat/pressure process. This can be carried out by technicians on site. The same heat/pressure process is used in liner manufacture or modification and does not affect the overall integrity of the liner. Alternatively, for overseas or remote installations, specially prepared “cold” repair kits are available.
For further information contact us on email@example.com or telephone our team on 01432 269605