EN ISO 8989:1998 PDF

Overview

EN ISO 8989:1998 (ISO 8989:1995) specifies a laboratory method to determine the water miscibility (water tolerance) of liquid phenolic resins. The test quantifies the percentage by mass of water required to produce a persistent turbidity in the resin under controlled conditions. This second edition replaces the first (1988) and revises the procedure to use grade 3 water (ISO 3696) instead of distilled water.

Key topics and requirements

• Scope: Applicability to liquid phenolic (thermosetting) resins; miscibility depends on resin chemistry and degree of condensation.
• Test temperature: Performed at 23 °C ± 0.1 °C; both resin and water must be conditioned to this temperature prior to testing.
• Reagent: Grade 3 water as defined in ISO 3696.
• Apparatus: Typical laboratory equipment required includes a 100 ml (or larger) beaker, short solid-stem thermometer (19–31 °C, 0.1 °C divisions), magnetic stirrer, 50 ml burette (0.1 ml divisions, class A), and an analytical balance (0.01 g accuracy).
• Sample mass: Test portions typically 10 g to 50 g; use a larger container if expected miscibility exceeds 900%.
• Procedure highlights:
  • Perform a preliminary test to estimate miscibility if unknown.
  • Add water in stages: initial addition ~50% of expected amount, subsequent ~10% steps until turbidity appears/vanishes on stirring, then add dropwise until turbidity persists for at least 30 seconds after agitation.
  • Record the volume V (ml) of water added.
• Result expression: Water miscibility WM (%) = (V / m) × 100, where V is water volume (ml) and m is mass of resin test portion (g). Optionally results can be expressed as ratio 1:x where x = WM/100.
• Reporting: Include reference to the standard, resin identification, test conditions and date, and calculated result.

Applications and users

• Who uses it: Resin manufacturers, quality control laboratories, R&D teams, and suppliers of thermosetting materials working with liquid phenolic resins.
• Practical uses:
  • Quality control to ensure consistent water tolerance for processing (mixing, storage, handling).
  • Formulation development and R&D to compare degrees of condensation and additive effects on water miscibility.
  • Supplier and customer specifications where water compatibility affects processing performance or end-use properties.
• Keywords: EN ISO 8989:1998, ISO 8989:1995, liquid phenolic resins, water miscibility, water tolerance test, phenolic resin water compatibility, grade 3 water (ISO 3696).

Related standards

• ISO 3696 - Water for analytical laboratory use (grade 3)
• ISO 385-1 / ISO 385-2 - Laboratory glassware - Burettes
• ISO 654 - Short solid-stem thermometers for precision use
• ISO/TC 61 SC12 - Technical committee responsible for thermosetting materials