ISO 11909:2007

Overview

ISO 11909:2007 specifies general test methods for polyisocyanate resins and their solutions intended as binders in paints, varnishes and related products. The standard consolidates recommended laboratory tests to assess key quality attributes - such as colour, viscosity, non-volatile matter (NVM), density, flashpoint and isocyanate (NCO) content - and includes a normative Annex (Annex A) for the determination of isocyanate content.

This International Standard supports quality control, product development and regulatory compliance by harmonizing test procedures referenced to established ISO methods.

Key Topics

• Scope and purpose: Applies to polyisocyanate resins and solutions used as binders in coatings.
• Properties and test methods: Table 1 in the standard lists required tests and references, including:
  • Colour (ISO 6271 or ISO 4630)
  • Viscosity (ISO 3219)
  • Non-volatile matter (ISO 3251)
  • Flashpoint (ISO 1523 or ISO 3679)
  • Density (ISO 2811 series)
  • Isocyanate content (Annex A of ISO 11909:2007)
  • Monomeric diisocyanate content (ISO 10283)
• Isocyanate content (Annex A): The normative method reacts the resin with excess dibutylamine and back-titrates the excess with hydrochloric acid; potentiometric titration is specified for highly coloured materials. Precision data and reporting requirements are provided.
• Sampling and references: Sampling follows ISO 15528; the standard integrates many normative references to support reproducible laboratory practice.

Applications

ISO 11909:2007 is practical for:

• Quality control laboratories verifying batch-to-batch consistency of polyisocyanate binders.
• Product development teams assessing formulation stability and raw-material quality.
• Regulatory and compliance functions ensuring reported NCO levels and physical properties meet specifications.
• Suppliers and purchasers who require agreed test methods for acceptance testing and technical data sheets.

Benefits include harmonized test reporting, reduced disputes over analytical methods, and improved comparability of material data across suppliers and regions.

Related Standards

Key referenced standards in ISO 11909:2007 include:

• ISO 3219 - viscosity determination
• ISO 3251 - non-volatile-matter content
• ISO 2811 (Parts 1–4) - density determination
• ISO 1523 / ISO 3679 - flashpoint methods
• ISO 10283 - monomeric diisocyanate determination
• ISO 15528 - sampling of paints, varnishes and raw materials

For laboratories and manufacturers working with isocyanate-based binders, ISO 11909:2007 provides an essential framework of test methods to ensure consistent, reliable evaluation of product quality.