Materials

Elastomers

Standard, Drain, Adaptor, Extra Wide, Euro, Chemical, Wraparound Couplings, Bushes, Gully Seals, F-910 Wall Seals and Puddle Flange

The elastomeric sleeves of the above couplings are made from synthetic elastomers in either Ethylene Propylene Diene Monomer (EPDM) or Styrene Butadiene Rubber (SBR). Both these elastomers offer excellent resistance to normal sewage and drainage effluents, with EPDM having the advantage of being inherently resistant to ozone.

Flexseal nitrile rubber couplings are used where resistance to oils and hydrocarbon solvents is required. They should only be used where hydrocrabons are diluted by other effluent.

Normal sleeves made from synthetic elastomer (EPDM or SBR) conform to BS EN681-1: 'Elastomeric joint rings for pipework and pipelines - drainage'. They also comply to the UK and European requirements of ISO4633: 1986, Australian Standard AS 1646 and BRC-2013.

Elastomeric sleeves are available in width sizes, 190, 300, 305 & 405mm.

Standard Couplings 1000mm and above

The elastomeric body or sleeve is made from a dual hardness strip manufactured using the latest moulding technology. The strip (available in either EPDM or nitrile) has the main section in 60 IRHD elastomer for long term performance and stability. The raised sections of the strip under the clamping bands are in 40 IRHD elastomer which provide an effective sealing performance on most pipe surfaces.

End Stoppers

The main body of the stopper is Polypropylene with an EPDM lip seal.

Flexible Saddles

The main body is manufactured in ABS plastic and EPDM elastomer conforming to BS EN681-1: 1996.

Fernco Plumbing Products

Produced from a thermoplastic elastomer.

Insitu-Seal

Manufactured from SBR and EPDM.

Storm Drain

Produced from a lightweight recycled aluminium and polypropylene.

Stainless Steel Clamping Bands, Shear Rings and Components

The term stainless steel is applied to a range of iron based alloys which rely on their chromium content for corrosion resistance. The chromium oxidises form a hard, protective and invisible surface coating. This prevents further corrosion until the surface is broken, at which point the process repeats.

The corrosion that occurs on stainless steel can take various forms but in the case of soils/backfills it is most likely that only pitting/crevice corrosion will take place in the soil environment. Research projects in a number of countries have shown that austenitic stainless steel (17% Chromium, 8% Nickel) have satisfactory performance in the usual types of soils giving a design life in excess of 50 years. However they are subject to pitting in poorly drained gravels, industrial or colliery spoil and in cases where the ground or groundwater contains chlorides (exceeding 1000 p.p.m). In these cases the application of a protective wrapping (such as a water resistant tape) will give adequate protection. Alternatively, a grade of austenitic stainless steel with the addition of molybdenum will give significantly improved corrosion resistance and will not require any additional protection.

Flexseal can therefore supply couplings with stainless steel components in two grades of austenitic steel to suit either normal applications or for when additional resistance to pitting attack is required:-

1. Normal applications use grade 1.4301 (304) or 1.4306 austenitic stainless steel to BS EN10088-2: 1995. This grade meets the requirements of BS EN295: Part 4: 1995 and WIs 4-41-01 i.e. the minimum chromium/nickel contents are greater than 17%/8%. It is in accordance with the requirements of Euronorm 88: Parts 1 and 2 Table 1c as appropriate.
2. High corrosion resistance applications require grade 1.4401 (316) austenitic stainless steel to BS EN10088-2: 1995. This grade contains a minimum of 2% molybdenum and is particularly suited for use in soils or groundwater containing chlorides such as marine environments. Also complies with the requirements of AS 1449, for grade 1.4401 (316).

End Caps

The stainless steel on these items are made from high corrosion resistant marine grade 300 series austenitic stainless steel to BS 970 Part 1: 1983 or BS 1449 Part 2: 1983 as applicable.

Couplings available with components in:

• Standard (SC)
• Large (LC)
• Extra Wide (W)
• Wraparound (WRC)
• Euro (TC)
• Drain (DC)
• Adaptor (AC)
• Plumbing (PC)

Couplings Available with Nitrile:

• Rubber 1.4401 (316) Grade Stainless Steel
• Fernco Range
• Standard (SC)
• Large (LC)
• Bushes (BC) Preformed & Fabricated
• Wraparound (WRC)
• Drain (DC)
• Adaptor (AC)
• Plumbing (PC)