SIST EN ISO 13632:2012 PDF

Overview

EN ISO 13632:2012 - "Binders for paints and varnishes - Rosin - Sampling and sample preparation for colour measurement" specifies standardized procedures for taking and preparing rosin (and rosin derivatives) samples for colour assessment. It covers sampling from drums, molten/liquid material, and solid forms such as flakes, pellets or pastilles, and describes how to prepare neat rosin or rosin-in-solution specimens for colour measurement. The standard references the colour-measurement methods in ISO 4630-1/2 and ASTM D509 and includes an informative Annex on correlating the USDA and Gardner colour scales.

Key Topics and Requirements

• Scope of samples: Sampling from drums, molten/liquid rosin, flakes, pellets or pastilles. Samples must be freshly broken and free of dust or finely divided material.
• Neat rosin preparation (Gardner):
  • Melt sufficient material in a clean container under inert atmosphere (oven, hotplate, heat gun, sand or oil bath).
  • Avoid overheating and bubble formation; stir slowly.
  • Time from start of heating to pouring must not exceed 15 minutes.
  • Pour molten rosin into a test tube or cuvette and measure colour while still molten.
• Rosin in solution (Gardner):
  • Prepare a 50.0:50.0 (by mass) solution in analytical-grade toluene; dissolve at room temperature and pour into a cuvette.
  • Preparation-to-pour time ≤ 15 minutes.
• USDA method:
  • Melt and pour molten rosin into a mould forming a 22.2 mm cube (viewing direction).
  • Same 15-minute heating-to-pour limit applies.
• Measurement and reporting:
  • Colour measurement performed per ISO 4630-1/2 (Gardner) or ASTM D509 (USDA).
  • Test reports must state the sample-preparation method used.
• Scale correlation:
  • Annex A provides a method to correlate Gardner and USDA scales, accounting for different path lengths (approx. 10 mm test tube/cuvette vs 22.2 mm USDA cube) and using transmittance corrections (Beer’s law assumption) and CIE x,y,Y data.

Applications and Users

• Quality control laboratories testing rosin colour for paints, varnishes and adhesives.
• Rosin producers and processors who need consistent sampling and colour reporting.
• Paint and varnish formulators and raw-material procurement teams specifying rosin colour limits.
• Third‑party test houses and certification bodies performing standardized colour assessments.
• R&D teams comparing historical USDA data with Gardner-scale results using the Annex A correlation.

Related Standards

• ISO 4630-1: Gardner colour scale - visual method
• ISO 4630-2: Gardner colour scale - spectrophotometric method
• ASTM D509: Sampling and grading rosin (USDA colour)
• ASTM D1544, ASTM D6166 and relevant national standards (e.g., GB/T 8145/8146) for related test methods

Keywords: EN ISO 13632:2012, rosin sampling, sample preparation, colour measurement, Gardner scale, USDA scale, binders for paints, varnishes, rosin colour.