Incorrect EF Jointing
The ElectroFusion system has over the years proved to be an extremely reliable jointing system, however, failures do emerge from time to time.
In the vast majority of failures the root cause is due to problems resulting from incorrect installation.
The most common failures are associated with poor surface preparation -“contamination failures”.
Make up of typical ElectroFusion failures • Contamination - poor preparation: 80% • Geometry - pipe not cut square etc. 10% • Movement - pipe not clamped: 10%
Contamination failures Contamination failures result in incomplete jointing due to an oxidized or dirty layer acting as barrier and preventing the plastic of the fitting fusing with the plastic of the pipe. Common causes of contamination: • Poor scraping due to uncompleted hand scraping or blunt mechanical scraper • Dirt
• Mud • Dust • Grease • Oils (two stroke oil etc) • Moisture • Hands (body grease, sunscreen,...) • Solvents
• Unsuitable Wiping Fluids • Unclean or unsuitable Rags
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