This appraisal is for a range of ductile iron polymeric coated backing rings for use with polyethylene (PE) stub flanges.

The sizes included in the scope of this appraisal are DN 80/90, DN 100/125, DN 150/180, DN 200/225, DN 225/250, DN 250/280, DN 300/315, DN 450/450 and DN 600/630.

Backing rings for use with PE stub flanges have traditionally been manufactured from galvanised mild steel or stainless steel. Ductile iron backing rings offer a technically equivalent and competitive alternative.


Product categoryBacking Rings
PA NumberPA 2312
Report holderWenac Australia Pty Ltd
StandardAS/NZS 4087:2011 Flanges for water supply applications ISO 9624:2019 Thermoplastics piping systems for fluids under pressure - Flange adapters and loose backing flanges-Mating dimensions.
Publication date
Expiry date

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Title Format Download
PA 2312 CERTIFICATE - Wenac - DI Backing Rings for PE Stub Flanges-Final.pdf PDF