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Automated Ash Determination & Residue on Ignition Testing - Meeting EN ISO 3451-1Method D and Ph. Eur. 2.4.14 Requirements
Release time:
2026-07-09
Traditional ash and residue on ignition (ROI) testing relies on manually shuttling crucibles between a muffle furnace, a desiccator, and an analytical balance - a labor-intensive process prone to human error, moisture absorption, and safety risks. With the introduction of EN ISO 3451-1:2019Method D (Automated Instrument Method) and the well-established European Pharmacopoeia 2.4.14 / British PharmacopoeiaAppendix XII D (Residue on Ignition / Sulfated Ash), modern laboratories are transitioning to fully integrated constant-weight analyzers.
Standards Overview
EN ISO 3451-1:2019 (Method D) - Plastics - Determination of Ash - General Methods
Recognizes automated instruments capable of programmed carbonization, high-temperature ashing (up to 950°C), controlled cooling, and continuous mass monitoring with ±0.1 mg balance readability. Method D is designed for higher throughput and improved repeatability compared to conventional muffle furnace procedures.
Ph. Eur.2.4.14 / BP Appendix XII D (Residue on Ignition / Sulfated Ash)
Requires ignition of the sample (with sulfuric acid treatment where specified) at 600 ± 50°C or 800 ± 25°C until constant weight is achieved (typically ≤0.5 mg difference between two successive weighings). Crucibles must be pre-ignited and weighed under strictly controlled conditions.
How LabStone IRT Series Meets These Standards?
The LabStone Ignition Residue and Ash Constant Weight Analyzer (Model IRT-121/161/191/321-A) integrates the ignition chamber, cooling chamber, and 0.1 mg METTLER TOLEDO analytical balance into a single enclosed system - fully aligning with EN ISO 3451-1Method D and Ph. Eur. 2.4.14 workflow requirements:
Requirement | IRT Series Capability |
|---|---|
Temperature Range | RT ~ 1000°C, with ±0.5°C control below 150°C and ±2°C above 150°C - covers 600/750/800/850/950°C specified in ISO 3451-1 and Ph. Eur. 2.4.14 |
Constant Weight Precision | Auto constant-weight judgment at 0.3 mg (exceeds Ph. Eur. ≤0.5 mg requirement) |
Controlled Cooling & Weighing | Water-cooled isolated weighing chamber eliminates desiccator moisture absorption errors common in manual methods |
Stepwise Carbonization | Programmable multi-stage ramp to prevent sample spattering before ashing |
Sulfated Ash Option | Optional automatic sulfuric acid dosing device for Ph. Eur. 2.4.14 sulfated ash procedures |
Data Integrity | Optional GMP Module with audit trail, electronic signature, and 21 CFR Part 11–style user access control |
Throughput | 12 / 16 / 19 / 32 parallel crucible positions for unattended batch testing |
Pre-installed methods include ISO 3451-1 (Method A/D), Ph. Eur. 2.4.14 ROI/Sulfated Ash, USP <281>, ChP 0841, GB 5009.4, ASTM D7348, and more - allowing immediate deployment in pharmaceutical QC, polymer R&D, food contact material testing, and third-party labs.
By adopting an automated constant-weight approach compliant with EN ISO 3451-1:2019 Method D and Ph. Eur. 2.4.14 / BP Residue on Ignition, laboratories can eliminate manual handling risks, reduce testing time, and achieve superior data traceability - all while meeting international accreditation expectations.
Ignition Residue and Ash Constant Weight Analyzer
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The Total Migration and Non-Volatile Residue Constant Weight Tester is a laboratory instrument designed for precise gravimetric analysis of residues in packaging materials, food contact materials, pharmaceuticals, and chemical products.
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