Overview
EN ISO 16482-1:2016 specifies the oven method for determining the non-volatile-matter (NV) content of aqueous rosin-resin dispersions used as binders in paints and varnishes. The procedure measures NV by mass after controlled evaporation of water at elevated temperature and is applicable to resin dispersions with a softening point of 60 °C to 100 °C (measured in accordance with ISO 4625-1, ring-and-ball method).
This standard is part of ISO 16482 (which also includes a microwave method) and is adopted as a CEN standard for consistent binder quality control across coatings laboratories.
Key Topics
- Scope and applicability: Oven method for aqueous rosin-resin dispersions with specified softening point range.
- Principle: Evaporate water from a measured test portion at 135 °C in a non-convection oven and determine the mass of the residue to calculate NV as a percentage by mass.
- Required apparatus:
- Analytical balance accurate to 0.0001 g.
- Aluminium dishes (bottom diameter (45 ± 5) mm; rim height ≤ 40 mm).
- Non-convection oven maintained at (135 ± 3) °C and a convection oven at about 160 °C for dish drying.
- Reagents: Chemically pure toluene and acetone for dish cleaning where required.
- Sampling and repeatability: Follow ISO 15528 for representative sampling; perform determinations in triplicate and report the mean to one decimal place.
Applications
- Quality control of binders for paints and varnishes to confirm non-volatile content and consistency between production batches.
- Verification of raw material specifications where NV influences film formation, solids content, and coating performance.
- Laboratory acceptance testing and routine production checks to support formulation decisions and compliance with product specifications.
Practical notes:
- Dishes are cleaned (toluene then acetone), solvent-evaporated, and dried in the convection oven at about 160 °C for at least 24 h before use.
- For each test, three dried dishes are cooled, weighed, filled with the specified test portion, dried at 135 °C (non-convection) until a constant weight is reached (minimum 45 minutes), cooled, and reweighed.
- Calculate NV from the loss in mass and report the average of three valid results.
Related Standards
- ISO 4625-1 - Determination of softening point (ring-and-ball method); used to establish applicability (60–100 °C).
- ISO 15528 - Sampling of paints, varnishes and raw materials; defines representative sampling procedures.
- ISO 16482-2 - Microwave method (alternate technique for NV determination) - referenced as part of the ISO 16482 series.
This standard provides a reproducible, well-defined laboratory method to obtain reliable NV values for rosin-resin dispersions, supporting consistent binder evaluation and coating quality control.