Overview - ISO 14453:2014 (Pulps - Determination of acetone-soluble matter)
ISO 14453:2014 specifies a laboratory method to determine the acetone-soluble matter in pulp. Applicable to all pulp types, the standard measures wood extractives (often called resin) - for example fatty acids, resin acids, fatty alcohols, sterols, glycerides and waxes - that dissolve in acetone. The practical lower limit is about 0.05% (can be reduced by increasing sample mass). The method uses either classical Soxhlet extraction (Option A) or automated Soxtec-type extraction (Option B).
Key topics and technical requirements
- Principle: Extract pulp with acetone, evaporate solvent, dry residue at 105 °C and report acetone-soluble matter as percent of oven-dry pulp.
- Extraction methods:
- Option A: Soxhlet apparatus - extraction rate ≥ 4 cycles/hour, total extraction time ≥ 4 h.
- Option B: Soxtec (or equivalent) - boil for ≥ 15 min (typical for low-extractive pulps) then rinse 1 h; longer boil (up to 1 h) recommended for high-extractive samples.
- Sample size: Typical test specimens ~5–10 g; use two replicates. Ensure extract mass > 5 mg (combine extracts if needed).
- Reagents and safety: Acetone, analytical grade. Acetone is highly flammable - use approved heating and work in a fume hood.
- Apparatus: Extraction thimbles, boiling beads, glass fibre wool, porosity filters, aluminium weighing dishes, ventilated oven (105 ± 2 °C), balance with 0.1 mg precision.
- Blanks and calculations: Run solvent blanks for each batch; if blank residue > 0.1 mg, correct the result. Result formula: X (%) = ((a − b) / m) × 100 where a = extraction residue (g), b = blank residue (g), m = oven-dry sample mass (g).
- Precision and validation: The second edition updates include automated extraction and a precision statement aligned with ISO/TR 24498.
Applications and practical value
- Quality control and process monitoring in pulp mills and paper mills (detecting resin/extractive load).
- Raw-material evaluation and acceptance testing for market pulp.
- R&D and troubleshooting for pulping, bleaching, and deinking operations where extractives affect process chemistry, pitch control or product properties.
- Environmental and regulatory labs assessing extractable organics in pulp samples.
Who should use it
- Laboratory analysts, pulp chemists, QA/QC teams in pulp and paper industry, contract testing laboratories, and materials researchers needing a standardized, reproducible method for measuring acetone-soluble extractives.
Related standards
- ISO 7213 - Pulps: Sampling for testing
- ISO 638 - Determination of dry matter content (oven-drying method)
- Reference: ISO/TR 24498 (precision guidance)
Keywords: ISO 14453:2014, acetone-soluble matter, pulp testing, Soxhlet extraction, Soxtec, pulp analysis, wood extractives, pulp quality control.
