Overview
ISO 801-2:1994 - "Pulps - Determination of saleable mass in lots - Part 2: Pulps (such as flash-dried pulps) baled in slabs" defines a standardized method for measuring the dryness of pulp bales and calculating the saleable mass for commercial transactions. It replaces the 1979 edition and is intended for bales of approximately 200 kg made up of 4–6 slabs or naturally delaminateable bales. The method uses a disc (drilling) sampling procedure and laboratory drying to determine oven-dry mass and absolute dryness before computing saleable mass against a conventional commercial dryness (typically 88% or 90%).
Key topics and technical requirements
- Scope and applicability
- Applicable to most pulps baled in slabs (including flash-dried pulps) in standard bales ≈200 kg.
- Not applicable to pulp baled in sheet form or unitized bales, nor when the drilling device becomes appreciably hot from friction.
- Sampling method
- Disc-shaped test pieces (≈100 mm diameter, ~20 mm thick) are drilled from specified positions on slabs using a random card system of 35 sampling positions to ensure representative coverage.
- Number of sample bales follows a sliding scale tied to total lot size; total sampled slabs should be close to a multiple of 35.
- Equipment and measurement
- Scales for bale weighing: accuracy at least 1/1 000.
- Laboratory balance for test pieces: capacity ≥5 kg, sensitivity 0.1 g (accuracy ≈1/5 000).
- Commercial drill and drill stand with cutting tool, ventilated drying oven controlled at 105 °C ± 2 °C, and drying containers with wire mesh.
- Drying and calculations
- Oven-dry mass determined by drying to constant mass at 105 °C ± 2 °C.
- Absolute dryness = (oven-dry mass / initial mass) × 100%.
- Saleable mass = (gross mass × absolute dryness) / theoretical commercial dryness (expressed in kg); results reported to the nearest 1 kg.
- Reporting
- Test report must reference ISO 801-2, identify the lot, give saleable mass, note unusual features and any optional operations used.
- Annex A provides a model certificate of analysis; Annex B summarizes the investigation justifying the disc sampling approach.
Applications and users
Who uses ISO 801-2:
- Pulp mills and production quality-control labs for inventory and dispatch.
- Buyers, sellers and traders to calculate invoiced mass and contract compliance.
- Inspection bodies, auditors and dispute-resolution experts in pulp trade.
- Shipping and customs personnel needing standard mass specifications.
Practical uses:
- Determining invoiceable mass for commercial pulp lots.
- Establishing audited moisture content and saleable mass in sales contracts.
- Reducing commercial disputes by applying an internationally recognized sampling and drying procedure.
- Ensuring repeatable, documented testing for trade and quality assurance.
Related standards
- ISO 801-1: Pulps - Determination of saleable mass in lots - Part 1: pulp baled in sheet form.
- ISO 801-3: Pulps - Determination of saleable mass in lots - Part 3: unitized bales.
Keywords: ISO 801-2, saleable mass, pulp sampling, flash-dried pulps, baled in slabs, oven-dry mass, absolute dryness, disc sampling, pulp quality control.