Overview
ISO 801-1:1994 - "Pulps - Determination of saleable mass in lots - Part 1: Pulp baled in sheet form" specifies a reproducible method to determine the dryness and calculate the saleable (invoiced) mass of pulp sold in sheet‑baled form. This second edition (1994) replaces the 1979 edition and is applicable to all kinds of pulp baled as sheets (not slabs or unitized bales). The standard defines key terms (gross mass, oven‑dry mass, absolute dryness, theoretical commercial dryness and saleable mass) and provides a full sampling, testing and calculation procedure.
Key topics and technical requirements
- Scope and definitions: Establishes how saleable mass is derived from gross mass and absolute dryness relative to a conventional commercial dryness (commonly 88% or 90%).
- Sampling plan: Uses a sliding scale for the number of sample bales based on lot size (for example, 12–24 sample bales for lots up to 100 bales; sample counts rise with lot size up to hundreds or thousands as specified in the standard).
- Sample selection: Sample bales must be representative and selected at random from the lot; certain bales (outer faces showing drying/wetting, damaged or previously sampled) are excluded.
- Specimen sheets and test pieces: From each sample bale, five specimen sheets are taken at defined positions. Test pieces are triangular and may be cut by either:
- Alternative 1: constant area triangles, or
- Alternative 2: constant apex angle (24°).
- Weighing and drying: Sample bales weighed on a scale (accuracy ~1/1 000). Test pieces are dried in a ventilated oven at 105 °C ± 2 °C to constant mass and weighed on a balance (accuracy ~1/5 000). Procedures to avoid moisture gain/loss during handling are specified.
- Calculation: Saleable mass = gross mass × (oven‑dry mass / initial mass) ÷ theoretical commercial dryness (see standard for formal expression). Annex A provides a worked certificate of analysis; Annex B covers marking equipment.
Practical applications
- Contract settlement and invoicing for pulp shipments where mass is adjusted for moisture.
- Quality control and acceptance testing at pulp mills, warehouses, ports and pulp trading companies.
- Dispute resolution between sellers and buyers over delivered mass and moisture content.
- Inventory valuation and customs documentation when saleable mass (dry basis) is required.
Who should use this standard
- Pulp producers and mill quality laboratories
- Trading houses, buyers and consignee inspection teams
- Third‑party testing and certification laboratories
- Logistics and warehouse managers responsible for lot acceptance
Related standards
- ISO 801-2: Pulps baled in slabs (flash‑dried pulps)
- ISO 801-3: Unitized bales
(ISO 801 is a multi‑part standard; see Parts 2 and 3 for other bale formats.)
Keywords: ISO 801-1, pulp saleable mass, pulp baled in sheet form, dryness determination, sample bales, oven-dry mass, pulp testing, saleable mass calculation.
