ISO 8873-3:2007

Overview

ISO 8873-3:2007 - “Rigid cellular plastics - Spray-applied polyurethane foam for thermal insulation - Part 3: Test methods” defines the laboratory test procedures used to verify spray‑applied polyurethane foam (SPF) against the material requirements in ISO 8873-1. Part 3 focuses on standardized methods for measuring volatile organic compound (VOC) emissions, air permeance and other properties relevant to thermal insulation performance and indoor air quality.

Key Topics and Requirements

• VOC measurement methods
  • Head‑space (static) analysis for initial identification of VOCs emitted by SPF samples.
  • Dynamic chamber procedures (A and B) to quantify emission rates and generate indoor‑air concentration profiles. Procedure A covers long‑term emissions after 30 days’ conditioning; Procedure B covers emissions starting 20–24 hours after installation and continuing for 30 days.
  • Methodology to estimate permissible indoor air concentrations, compare results to limits and assess material acceptability.
• Test chamber and environmental controls
  • Materials in contact with specimens must be chemically inert (glass, stainless steel, etc.).
  • Recommended dynamic chamber volumes (about 0.1–1.0 m³) and requirements for mixing, tracer‑gas validation and surface air velocity (≈ 0.04–0.05 m/s).
  • Sample storage and environmental enclosures with controlled temperature and humidity (e.g., storage at 23 ±2 °C, 50 ±5 % RH; environmental enclosure at 40 ±2 °C).
  • Air‑exchange system specifications (clean air delivery, humidification, flow control within 5 %, positive pressure operation).
• Air permeance testing
  • Procedures for determining air permeance (flow per unit area per Pa) of spray‑applied polyurethane foam.
• Sampling and analysis
  • Requirements for air‑sampling systems, absorbent media, GC/MS analysis (GC/MS‑SCAN), internal standards and reporting.

Applications and Who Uses This Standard

• Laboratories performing VOC emission testing and air‑permeance measurements for SPF products.
• Manufacturers of spray‑applied polyurethane foam validating product performance against ISO 8873‑1 material specifications.
• Specifiers, architects and consultants assessing indoor air quality and compliance for new construction and retrofit projects.
• Regulators and building authorities referencing test methods for product acceptance, labeling and safety compliance.
• Contractors and applicators using test‑based guidance to establish airing/ventilation periods after installation.

Related Standards

• ISO 8873-1 - Material specifications for spray‑applied polyurethane foam.
• ISO 8873-2 - Application practices for SPF. Note: ISO 8873‑3 provides the test methods required by ISO 8873‑1 and is intended to support consistent, comparable testing of SPF for thermal insulation and indoor‑air safety.

Keywords: ISO 8873-3, spray-applied polyurethane foam, test methods, VOC emissions, air permeance, thermal insulation, rigid cellular plastics, dynamic chamber, head-space analysis, indoor air quality.