ISO 2884-2:2003

Overview

ISO 2884-2:2003 - "Paints and varnishes - Determination of viscosity using rotary viscometers - Part 2" - defines a standard procedure for measuring the viscosity of paints, varnishes and related products (up to 34 Pa·s) using disc or ball rotary viscometers operated at a specified speed. The method is intended primarily for production and thinning control and is suitable for both laboratory and factory environments.

Key topics and technical requirements

• Scope: Viscosity measurement for products up to 34 Pa·s; mainly for production monitoring and thinning.
• Apparatus essentials:
  • Rotary viscometer (digital or analogue) operating at 562 rpm ± 2%.
  • Disc spindle (type 1) for viscosities up to 1.5 Pa·s (avg. shear ≈ 200 s⁻¹).
  • Ball spindles (types 2 and 3) for viscosities up to 6.5 Pa·s and 34 Pa·s (avg. shear ≈ 44 s⁻¹ and 20 s⁻¹).
  • Standard 250 ml container (nominal internal diameter 74 mm) - use the same can size when comparing samples.
  • Temperature-control device to maintain (23 ± 0.3) °C (procedure typically at 23 ± 0.5 °C).
  • Calibrated thermometer (±0.3 °C) and calibration fluids with certified Newtonian viscosities.
• Procedure highlights:
  • Sampling and sample prep per ISO 15528 and ISO 1513; optional sieving (125 µm) if required.
  • Calibrate/check instrument using three reference fluids at test temperature; readings must be within ±5% of certified values.
  • Ensure no air bubbles, allow thermal equilibrium, take readings at operating speed, and clean spindles after each run.
  • For thixotropic materials record both initial and final readings.
• Results & reporting: Express viscosity in Pa·s (1 Pa·s = 10 poise). Test report must include apparatus type, calibration dates, container dimensions, temperature, any deviations, thixotropic behavior, and operator identity.
• Precision: No precision data included in this edition.

Applications and users

ISO 2884-2 is practical for:

• Quality control laboratories in paint, varnish and coatings manufacturing
• Production lines monitoring viscosity during formulation and thinning
• R&D and formulation teams validating process viscosity targets
• Suppliers and contract labs performing routine viscosity checks

Keywords: ISO 2884-2:2003, viscosity determination, rotary viscometer, disc viscometer, ball viscometer, paints and varnishes, viscosity measurement, production thinning, spindle calibration.

Related standards

• ISO 2884-1 (cone-and-plate viscometer)
• ISO 2431 (flow cups)
• ISO 3219 (rotational viscometer with defined shear rate)
• ISO 1513, ISO 15528 (sampling & sample preparation)
• ISO 3104, ISO 3105 (viscosity reference methods and capillary viscometers)

This standard ensures consistent, repeatable viscosity measurements for production control and reliable communication of results across suppliers and customers.