ISO 7387-1:1983

Overview

ISO 7387-1:1983 - Adhesives with solvents for assembly of PVC‑U pipe elements - Characterization - Part 1: Basic test methods defines the basic laboratory methods used to characterize solvent‑based adhesives for unplasticized polyvinyl chloride (PVC‑U) piping. Part 1 specifies three fundamental tests used to decide the uniformity and basic properties of these adhesives: viscosity (dynamic and Brookfield), conventional dry matter content, and ash content (where applicable).

Key topics and technical requirements

• Viscosity (Section one)

  • Two methods: dynamic viscosity according to shear rate (reference method) and Brookfield RV “viscosity” (manufacturing/inspection).
  • Dynamic method: measures shear stress vs shear rate at controlled temperature to determine Newtonian or non‑Newtonian behaviour and produce z = f(γ) curves.
  • Brookfield method: uses RV, RVF-100 or RVT viscometers with specified moving bodies and speeds; tests are normally run at 23 ± 1 °C in a thermostatted bath. Results reported as Brookfield RV viscosity with the speed/moving‑body pairing; stability and repeatability rules apply (consecutive readings tolerance).
  • Practical measurement details: selection of speed and spindle to keep readings within instrument scale, expression of results to three significant figures, attention to thixotropy.

• Conventional dry matter content (Section two)

  • Procedure: deposit a defined test portion (≈0.5–1 g) on pre‑dried plates, allow solvent evaporation (10–15 min), then final drying at 110 °C for 60 min in a ventilated oven.
  • Equipment: drying oven (thermal inertia), balance accurate to 0.1 mg, desiccator, syringe for sampling. Results expressed as percentage of residue relative to original mass.

• Ash content (Section three)

  • Included for adhesives that do not contain fillers unstable at test temperature. (ISO 7387-1 identifies ash content as a basic characterization parameter; specific procedural steps are given in the full standard.)

Applications and users

• Quality control and incoming inspection for adhesive manufacturers, PVC‑U pipe and fittings producers, and fabricators.
• R&D and formulation laboratories assessing batch-to-batch uniformity and rheological behaviour.
• Third‑party testing and certification bodies establishing compliance with material specifications.
• Procurement and specification writers who need objective test methods for supplier acceptance criteria.

Related standards

• ISO 7387 (other parts): Part 2 (secondary test methods) and Part 3 (separation/characterization methods).
• ISO 2555 is referenced as the basis for the Brookfield RV viscosity procedure.

Keywords: ISO 7387-1:1983, adhesives with solvents, PVC‑U pipe, viscosity testing, Brookfield viscosity, dynamic viscosity, dry matter content, ash content, solvent‑based adhesive characterization, test methods.