EN ISO 4577:2019 PDF

Overview

EN ISO 4577:2019 - Plastics - Polypropylene and propylene-copolymers - Determination of thermal oxidative stability in air - Oven method specifies a laboratory procedure to evaluate the resistance of moulded polypropylene (PP) and propylene-copolymers to accelerated ageing by heat in the presence of air using a forced‑draught oven. The method provides an empirical time‑to‑failure under severe thermal‑oxidative conditions and can be used to estimate service life of parts made from propylene plastics. Results are indicative for the specified test environment and are not directly predictive under different service conditions.

Key topics and technical requirements

• Test principle: Accelerated ageing in a forced‑draught oven with visual inspection; failure = localized crazing, crumbling and/or discoloration.
• Recommended temperature: 150 °C (tests may be run at 100–150 °C; lower temperatures may be used for less heat‑stable grades).
• Oven & airflow: Mechanical convection (forced‑draught) oven; exhaust ≥ one oven‑chamber volume per 10 min; air velocity at specimen positions 0.75–1.0 m/s.
• Temperature control: Range up to 200 °C; stability ±1 °C at a single location and ±1.5 °C throughout the oven. Temperature recording is recommended.
• Specimens: Cut from compression‑moulded sheet per ISO 19069‑2; dimensions 50 × 10 × 1.0 mm (±0.05 mm); at least five specimens per test.
• Specimen mounting: Stationary, uniaxial or biaxial rotating holders are allowed; biaxial rotation is reference method in disputes.
• Measurements & reporting: Daily visual inspections; report time to failure in days; if failure at 150 °C