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Auteur/autrice : Justin

PP-R Fusion Joint Site Acceptance: The Pass/Fail Sheet an Inspector Signs

Green PP-R pipes joined with socket-fusion elbows and couplings on a site bench, a melt bead ring showing at each fitting mouth, beside a tape measure and a blank clipboard

A PP-R fusion joint passes site acceptance when four things hold. Its weld record is complete, the pipe went in to its depth mark, and the bead forms a complete, even ring on both sides. The pipe sits in the socket within 1° or 2°, depending on the assessment group. Anything else is a reject […]

PP-R Resin Datasheet: How to Read MFR, MRS and σLPL

Glass laboratory dish of green polypropylene resin pellets on a white bench beside three short cut lengths of green PP-R pipe and a blank sheet of paper with a steel pen

ISO 12162:2009, which turns long-term test data into pipe-resin grade numbers, says its classification “does not qualify a material for a specific application.” Keep that sentence in mind when a supplier sends a PP-R resin datasheet (TDS) as proof of what went into your pipe. Here is the short answer. The MFR line identifies the […]

PP-RCT Pipe vs PP-R: Order Controls That Catch a Swap

Two green polypropylene pipes of the same outside diameter on a steel inspection bench, cut square to show a thick wall and small bore beside a thinner wall and larger bore, with a steaming stainless test tank behind

A container of DN63 pipe lands for a hotel’s 70 °C hot-water risers. The print line says PP-RCT. Every length measures to size and every joint fuses, and none of that tells you which resin you bought, because PP-R and PP-RCT share outside diameters and fuse to each other. Here is the short answer. PP-RCT […]

PP-R Purchase Order Acceptance Clauses That Hold Up

Four cut sections of green PP-R pipe in descending diameters standing on a steel bench beside a pair of vernier calipers and a heap of green PP-R granules

Most PP-R purchase orders cannot support a rejection, and the reason sits in the document rather than the container. Under Article 35(1) of the CISG, goods conform when they match what the contract required. An order naming no standard, no measurement method and no notice period leaves all three open to argument. PP-R pipe purchase […]