7671 ((free)) -

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Underground pipes are subject to impact during installation (e.g., being dropped or hit by backfill material). The standard specifies an impact test using a falling weight method (Tup impact test) to ensure the pipe does not crack or shatter under sudden shock.

By standardizing these parameters, ISO 7671 allows engineers to design drainage networks with confidence that the components will fit correctly and survive the harsh underground environment for decades.