Overview
ISO 9311-1:2005 - "Adhesives for thermoplastic piping systems - Part 1: Determination of film properties" defines three laboratory test procedures for assessing the spreadability and film properties of solvent-containing adhesives used with thermoplastic piping systems. The standard distinguishes between non‑thixotropic and thixotropic adhesives and specifies equipment, conditioning, application speed and evaluation methods. Note that the three methods are intended for different adhesive rheologies and do not produce directly comparable results.
Key Topics and Requirements
- Scope: Tests apply to solvent-containing adhesives for thermoplastic piping (e.g., PVC‑U adhesives); three methods (A, B, C) cover non‑thixotropic and thixotropic types.
- Conditioning: Adhesive, applicator and test plates conditioned at (23 ± 2) °C and (50 ± 5) % RH for ≥6 hours.
- Apparatus:
- Applicator 1 with two faces (Face A for non‑thixotropic, Face B for thixotropic).
- Applicator 2 to produce a 100 mm wide film of (2 ± 0.1) mm thickness (used only for thixotropic adhesives).
- Glass and plastic test plates (recommended ≥150 mm × 250 mm); plastic plate material should be appropriate to the adhesive (e.g., PVC‑U).
- Application procedure: Apply adhesive immediately after opening at a speed of ~20 mm/s over a minimum length of 200 mm; apply three replicate films per method.
- Evaluation:
- Methods A & B: Compare resulting film to reference models (complete film, partial film, no film) and assign a score for each plate.
- Method C (thixotropic): Form a 2 mm film, hold plate vertically for 3 min, then horizontally; measure flow at 50, 100 and 150 mm along the lower film edge, calculate mean M and spreadability S using S = 100 − M (in mm).
- Inspect film continuity and note lumps or foreign matter.
- Test report: Must include standard reference, adhesive identification (lot/date), test method and plate type, individual and mean scores, film description, deviations and test date.
Applications and Users
- Useful for adhesive manufacturers (R&D and QC), third‑party testing laboratories, pipe and fittings producers, and specifiers/contractors needing objective data on adhesive spreadability and film quality for thermoplastic piping assemblies.
- Practical uses: product development, batch quality control, qualification of adhesives for joining thermoplastic pipes, and supporting compliance documentation.
Related Standards
- ISO 9311 series:
- ISO 9311-2 - Determination of shear resistance
- ISO 9311-3 - Test method for internal pressure resistance
- EN 923:1998 - Adhesives - Terms and definitions
Keywords: ISO 9311-1:2005, adhesives for thermoplastic piping systems, film properties, spreadability, thixotropic adhesives, applicator, solvent-containing adhesives, test methods.
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