Overview
EN ISO 11127-5:2021 (ISO 11127-5:2020) specifies a laboratory method for the determination of free moisture in non‑metallic blast‑cleaning abrasives used in surface preparation of steel prior to painting. Moisture is measured by the mass lost on heating; the procedure and reporting requirements are set out to support quality control, conformity assessment and specification compliance for blast‑cleaning abrasives.
Key topics and requirements
- Scope: Determines free moisture (%) in non‑metallic blast‑cleaning abrasives by drying and weighing. Part of the ISO 11127 test‑methods series for abrasives.
- Apparatus: ordinary lab glassware plus:
- container/tray resistant to heat,
- oven maintained at (110 ± 5) °C,
- balance accurate to 0.01 g,
- desiccator with suitable desiccant.
- Sampling: Take a representative sample following ISO 11127‑1 (Sampling); store sealed until tested.
- Test portion: Approximately 100 g test portion, weighed to 0.01 g. Container is pre‑dried, cooled in desiccator and tared before adding sample. Agitate sample to spread it and increase surface area for drying.
- Drying procedure: Place the test portion in the oven at (110 ± 5) °C for at least 1 hour, then cool in the desiccator and re‑weigh.
- Expression of results: Moisture content M (%) = (m0 − m1) / m0 × 100, where m0 is mass before heating and m1 after. Perform duplicate determinations; if they differ by > 0.05 % (absolute) repeat test. Report mean to nearest 0.01 %.
- Test report must include: product identification (per ISO 11126 where applicable), reference to ISO 11127‑5:2020, result, deviations, unusual observations, date and tester name.
Practical applications and users
- Quality control laboratories in abrasive manufacturing: verify moisture specification before packaging and shipment.
- Coating specifiers and inspectors: confirm abrasive condition to ensure consistent blast performance and coating adhesion.
- Contractors and asset owners: assess abrasive suitability on site or before use to avoid reduced abrasive effectiveness or contamination.
- Standards and compliance teams: use as a reference in procurement specifications for blast‑cleaning abrasives and surface preparation contracts.
Keywords: EN ISO 11127-5:2021, ISO 11127-5, determination of moisture, non‑metallic blast‑cleaning abrasives, moisture content, surface preparation, abrasive testing, ISO 11126.
Related standards
- ISO 11126 series - Specifications for non‑metallic blast‑cleaning abrasives (types and requirements).
- ISO 11127 series (other parts) - sampling, particle size distribution, apparent density, hardness, soluble contaminants, chloride tests.
