ISO 12460-5:2015

Overview

ISO 12460-5:2015 - "Wood-based panels - Determination of formaldehyde release - Part 5: Extraction method (called the perforator method)" specifies an extraction procedure (the perforator method) to determine the formaldehyde content of unlaminated, uncoated wood‑based panels. The result, expressed as the perforator value, represents the formaldehyde extracted from board test pieces and is intended as an indicator of the board’s formaldehyde content under defined test conditions.

Key topics and technical requirements

• Scope: Applies to unlaminated and uncoated wood‑based panels (particleboard, fibreboard, plywood, OSB).
• Principle: Formaldehyde is extracted by boiling toluene, transferred into water and determined photometrically using the acetylacetone method.
• Reagents & analysis: Uses toluene, acetylacetone, ammonium acetate, and standard formaldehyde solutions; measurement by spectrophotometer at 412 nm (50 mm path length recommended for low emitters).
• Apparatus: Detailed extraction/perforator assembly (Dimroth condenser, perforator attachment, round‑bottom flask, absorption bulb), water baths (including 60 ± 1 °C), and precision balance (0.01 g).
• Sampling & test pieces: Test pieces per ISO 16999; typical size 25 × 25 mm; about 110 g of sample for extraction (up to 200 g allowed for low emitters if density permits). Moisture content determined per ISO 16979.
• Conditioning: Default conditioning at 20 ± 2 °C and 65 ± 5 % RH to constant mass unless agreed otherwise.
• Procedure controls:
  • Extractions in duplicate (factory control may use single extraction).
  • Duplicate results must not differ by more than 0.5 mg/100 g; otherwise perform a third extraction.
  • Blank tests and calibration (incl. Annex A) are required; quality assurance provisions included.
• Result expression: Perforator value corrected for moisture content; moisture determination and reporting requirements are defined.

Applications and practical value

• Provides a standardized laboratory method to quantify formaldehyde content in wood panels for:
  • Product development and raw material evaluation (adhesive type, pressing conditions).
  • Quality assurance and factory production control.
  • Regulatory compliance checks and comparative testing between panel types.
• Useful when correlating laboratory content data with emissions measured by other methods (chamber, desiccator) - note that correlation depends on board type and test conditions.

Who should use this standard

• Test laboratories performing formaldehyde analysis on wood‑based panels.
• Quality control and R&D teams in panel manufacturing.
• Regulatory bodies, certification organizations, and third‑party testing services concerned with indoor air quality and material safety.

Related standards

• ISO 12460 (other parts): Part 1 (1‑m3 chamber), Part 3 (gas analysis), Part 4 (desiccator).
• ISO 16979 (moisture content) and ISO 16999 (sampling and cutting of test pieces).

Keywords: ISO 12460-5:2015, perforator method, formaldehyde release, wood-based panels, perforator value, extraction method, acetylacetone, toluene, formaldehyde content.