EN ISO 2578:1998 PDF

Plastics - Determination of time-temperature limits after prolonged exposure to heat (ISO 2578:1993)

Title (English):

EN ISO 2578:1998

Plastics - Determination of time-temperature limits after prolonged exposure to heat (ISO 2578:1993)

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 17
Publication date:: August 19, 1998
Edition:: CEN EN 2578 edition 1 version 1
ICS:: 83.080.01

Document language:

enru

Delivery time:1–7 days

Price:66 €

Description (English):

Specifies the principles and procedures for evaluating the thermal endurance properties of plastics exposed to elevated temperature for long periods. The study of the thermal ageing is based solely on the change in certain properties resulting from a period of exposure to elevated temperature. The properties studied are always measured after the temperature has returned to ambient.

Technical details

Technical committee: CEN/TC 249 - Plastics
SKU: EN ISO 2578:1998

Abstract

EN ISO 2578:1998 - Overview

EN ISO 2578:1998 (identical to ISO 2578:1993) defines procedures for evaluating the thermal endurance or time‑temperature limits of plastics after prolonged exposure to heat. The standard describes how to measure changes in selected mechanical, electrical or optical properties caused by thermal ageing; all measurements are made after specimens have returned to ambient conditions. The method assumes an Arrhenius‑type relationship between log(time to failure) and reciprocal absolute temperature to derive a temperature index (TI) and relative temperature index (RTI).

Key topics and technical requirements

Scope and principle
- Evaluates thermal ageing in air (thermal endurance), excluding other stresses.
- Uses changes in chosen properties to determine time to failure and extrapolate limits.
Test selection and end‑point
- Choose properties relevant to service (destructive or non‑destructive).
- Agree threshold (often 50% of initial value) and extrapolation time (commonly 20 000 h).
Test specimens and conditioning
- Prepare specimens per relevant test methods. Thermosets conditioned 48 h at lowest exposure temperature; thermoplastics may require annealing.
Exposure temperatures
- Use at least three temperatures (recommended 3–4) to establish an Arrhenius plot.
- Lowest temperature should give time to threshold ≥ 5 000 h; highest should not be

Related standards

Mentioned in the description and other EN standards

EN ISO 2578:1998 - Overview

Key topics and technical requirements

Scope and principle
- Evaluates thermal ageing in air (thermal endurance), excluding other stresses.
- Uses changes in chosen properties to determine time to failure and extrapolate limits.
Test selection and end‑point
- Choose properties relevant to service (destructive or non‑destructive).
- Agree threshold (often 50% of initial value) and extrapolation time (commonly 20 000 h).
Test specimens and conditioning
- Prepare specimens per relevant test methods. Thermosets conditioned 48 h at lowest exposure temperature; thermoplastics may require annealing.
Exposure temperatures
- Use at least three temperatures (recommended 3–4) to establish an Arrhenius plot.
- Lowest temperature should give time to threshold ≥ 5 000 h; highest should not be

EN ISO 2578:1998 PDF

Technical details

Abstract

EN ISO 2578:1998 - Overview

Key topics and technical requirements

Related standards

Abstract

EN ISO 2578:1998 - Overview

Key topics and technical requirements

Related standards

Plastics — Determination of time-temperature limits after prolonged exposure to heat

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