BS EN ISO 3451-4:2024
Plastics — Determination of ash Part 4: Polyamides

Standard No.

BS EN ISO 3451-4:2024

Release Date

2024

Published By

British Standards Institution (BSI)  GB  /  BSI

Latest

BS EN ISO 3451-4:2024

Introduction

Core changes and technological evolution of the standard

BS EN ISO 3451-4:2024 is the third revised standard of ISO 3451-4:1998. The main technical updates include:

• New automated equipment method (Method D) is synchronized with ISO 3451-1:2019
• Improve the processing process of volatile additives in flame retardant materials
• Clarify the temperature control requirement of muffle furnace to (850±50)°C

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Comparison of test method frameworks

Material type	Applicable method	Temperature requirement	Special treatment
Unfilled polyamide	Method A/D (direct calcination) Method C (sulfation treatment)	850±50°C	Method C is required when containing halides
Glass fiber reinforced material	Method A/D	850±50°C (reduced to 600±25°C when melted)	Pre-drying treatment is required
Material containing flame retardant	Method A/D+DBB treatment	≥850°C	Add 50% of the sample mass of DBB

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Analysis of key operating points

Safe implementation of DBB treatment method

For glass fiber reinforced materials containing antimony trioxide flame retardant, the standard requires:

1. The sample needs to be crushed to a size of less than 1cm×0.5cm×0.2cm
2. Add decabromobiphenyl (DBB) powder, the amount of which is 50% of the sample mass
3. High-temperature calcination must be carried out in a fume hood to avoid the formation of dioxins

Warning: 600-850°C is the high-risk temperature range for dioxin formation, and the experimental site needs to be equipped with an exhaust gas treatment system.

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Implementation suggestions and precision control

According to the PA/glass fiber material precision data provided by the standard:

• Repeatability limit (r) = 0.76% (same laboratory)
• Reproducibility limit (R) = 0.79% (different laboratories)

Operational suggestions:

1. When the ash content is <0.01%, the sample amount must be ≥200g to ensure measurement accuracy
2. Use Platinum crucible to handle halogen-containing samples to avoid corrosion
3. The results are retained to 1 decimal place (such as 33.2%)

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Standard application scenarios

This standard is particularly suitable for:

• Quantitative analysis of inorganic fillers in engineering plastics
• Formula Verification of Flame Retardant Polyamide Materials
• Determination of Glass Fiber Content in Recycled Plastics

Note:The test report must include key parameters such as calcination temperature, pretreatment method and DBB dosage.

BS EN ISO 3451-4:2024 Referenced Document

• ISO 3451-1:2019 Plastics — Determination of ash — Part 1: General methods

BS EN ISO 3451-4:2024 history

• 2024 BS EN ISO 3451-4:2024 Plastics — Determination of ash Part 4: Polyamides
• 2000 BS EN ISO 3451-4:2000 Plastics - Determination of ash - Polyamides
• 1991 BS EN ISO 3451-4:1996 Plastics. Determination of ash-Polyamides

Standard and Specification