ISO 18373-1:2007 PDF

Name: ISO 18373-1:2007 — Rigid PVC pipes — Differential scanning calorimetry (DSC) method — Part 1: Measurement of the processing temperature
SKU: ISO 18373-1:2007
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Rigid PVC pipes — Differential scanning calorimetry (DSC) method — Part 1: Measurement of the processing temperature

Название (английский):

ISO 18373-1:2007

Rigid PVC pipes — Differential scanning calorimetry (DSC) method — Part 1: Measurement of the processing temperature

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 3 июля 2007 г.
Издание:: ISO IS 18373 edition 1 version 1
ICS:: 23.040.20

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Описание (английский):

ISO 18373-1:2007 specifies a method for the determination of the processing temperature of rigid PVC pipe samples. The method is based on the measurement of the thermal history using differential scanning calorimetry (DSC) and is suitable for all types of rigid PVC pipes.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 18373-1:2007 defines a laboratory method to determine the processing temperature of rigid PVC pipes using differential scanning calorimetry (DSC). The standard measures the thermal history of small samples cut from pipe walls to identify the B-onset - the temperature that indicates the maximum processing temperature experienced during extrusion. The method is suitable for all types of rigid PVC pipes and helps link processing conditions to long‑term performance.

Key topics and requirements

Principle: Use DSC to detect small endotherms from crystallites; the B-onset corresponds closely to the pipe’s maximum processing temperature (Tp).

Sampling: Take at least four samples from the pipe centre at 0°, 90°, 180° and 270° around the circumference to detect local temperature variations.

Sample preparation: Test pieces mass (20 ± 10) mg; prepare thin disks to maximize contact with aluminium pans; avoid heat or mechanical stress during cutting.

DSC setup and calibration: Calibrate instrument using at least two metals and obtain an instrumental baseline with empty pans. Use inert purge gas (e.g., N2, Ar) of suitable quality.

Scan parameters (specified in standard):

Start temperature: (35 ± 15) °C
End temperature: 225 °C
Heating rate: (20 ± 1) °C/min
Purge gas per clause 4.3

Result determination: Use curve magnification and tangent extrapolation at points of maximum slope to determine B-onset. Repeatability criteria and discard irregular scans; if three consecutive repeats differ by > 3 °C further tests or recalibration required.

Sources of error: Sample inhomogeneity, movement in pan, residual stresses, additives producing spurious peaks, or frictional heat from sample cutting.

Reporting: Include reference to ISO 18373-1, sample IDs and positions, mean and standard deviation of B-onset, number of repeats, minimum B-onset, influencing factors and test dates.

Applications and users

Who uses it: PVC pipe manufacturers, materials and quality-control laboratories, independent testing bodies, R&D teams, and failure-analysis investigators.

Practical value:

Validate and control extrusion processing temperatures.
Identify local thermal variations in pipe production.
Correlate processing temperature with performance metrics (e.g., time to stress rupture).
Detect formulation effects (additives can create extra DSC peaks).

Related standards

ISO 18373-2 (DSC method - measurement of enthalpy of fusion of crystallites)

ISO 1167-1 (resistance to internal pressure - referenced for stress‑rupture correlation)

Keywords: ISO 18373-1:2007, rigid PVC pipes, DSC method, differential scanning calorimetry, processing temperature, B-onset, PVC pipe testing, quality control, pipe manufacturing.

ISO 18373-1:2007 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

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