Overview
EN ISO 7662:1996 (ISO 7662:1988) specifies a laboratory method for determining the abrasion of the internal lining of rubber and plastics hoses used in grit blasting, shot blasting and similar operations. The standard measures lining wear by passing a defined amount of abrasive grit through a hose sample and quantifying material loss. It is intended for hoses with an internal bore of 20–50 mm and is intended for comparative testing of abrasion resistance, not for setting absolute maximum-wear specifications.
Key topics and technical requirements
- Test scope: Lining abrasion determination for rubber and plastics hoses (bore 20–50 mm).
- Test specimen: Hose length 1 000 mm ± 50 mm.
- Abrasive (grit): Cast iron grit, 0.7–0.9 mm particle size, 58–60 HRC Rockwell hardness. Other grits allowed only if documented in the test report.
- Grit flow: 42 g/s ± 2 g/s at an air pressure of 250 kPa ± 25 kPa; cabinet contains 25 kg of circulate-able grit.
- Nozzle/ejector: Hard-metal blasting nozzle, internal diameter 10 mm ± 1 mm, cylindrical length 50–100 mm; nozzle inserted 25–50 mm into test piece with centreline alignment within 1°.
- Mounting and geometry: Test piece mounted vertically; bend radius r = 6 × nominal bore; fixture ensures nozzle–hose parallelism.
- Test duration: 400 min ± 1 min blasting.
- Measurements: Mass measured to 0.1 g before and after test; volume loss ΔV calculated from mass change and lining density (expressed in cm³).
- Reporting: Include hose description (lining density), reference to EN ISO 7662, grit type, grit flow, air pressure, test time, loss of volume, observations and test date.
- Comparability: Tests must use the same hose type/size and the same grit; results from different grit types are not comparable.
Applications and users
- Hose manufacturers: validate and compare lining compounds and constructions for abrasion resistance.
- Quality control and inspection labs: routine comparative testing and batch verification for blast-hose products.
- R&D and material suppliers: development and selection of abrasion-resistant elastomers and linings.
- Procurement and specifiers: assess relative performance of hoses intended for abrasive services (grit/shot blasting).
- Test houses: standardized method for delivering consistent, reproducible abrasion data.
Practical value and SEO keywords
This standard provides a repeatable, well-defined abrasion testing method for rubber hoses and plastic hoses used in abrasive services. Keywords: EN ISO 7662:1996, ISO 7662:1988, abrasion testing, hose lining abrasion, grit blasting hose test, abrasion resistance, rubber and plastics hoses, hose testing standard.
Related standards
- Prepared by ISO/TC 45 (Rubber and rubber products). For broader conformity, consult other ISO/CEN standards covering hose construction, materials testing and pneumatic equipment used in abrasive blasting processes.
