ASTM D8411-21 PDF
Name in English:
St ASTM D8411-21
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Ст ASTM D8411-21
Original standard ASTM D8411-21 in PDF full version. Additional info + preview on request
Full title and description
Standard Test Method for Rubber Compounding Materials—Determination of 2‑Mercaptobenzothiazole (MBT) in Rubber. This test method specifies a procedure to determine extractable MBT in cured rubber compounds using high‑performance liquid chromatography (HPLC) to assess extractable/bioavailable MBT for quality control and safety evaluation.
Abstract
This short test method describes extraction and HPLC analysis for quantifying 2‑mercaptobenzothiazole (MBT) that can be removed from rubber products. It is intended to measure the extractable MBT fraction (including MBT that may form from MBTS during vulcanization) to support product safety assessments, raw‑material control and R&D. The method yields a quantitative result useful for comparing materials and monitoring manufacturing processes.
General information
- Status: Active.
- Publication date: October 1, 2021 (designation D8411‑21).
- Publisher: ASTM International.
- ICS / categories: 83.040.20 (Rubber and elastomers – testing/analysis).
- Edition / version: D8411‑21 (2021).
- Number of pages: 3 pages.
Scope
This test method covers a procedure for the determination of extractable 2‑mercaptobenzothiazole (MBT) in rubber by high‑performance liquid chromatography (HPLC) for the purpose of assessing its bioavailability and potential release from finished rubber products. It is intended for use as a quality control and research tool and does not address all safety considerations associated with handling the chemicals or extracts.
Key topics and requirements
- Determination of extractable MBT in cured rubber compounds.
- Sample extraction procedure to recover MBT from rubber matrices prior to analysis.
- Quantitative analysis by HPLC with appropriate calibration and detection to report MBT concentration.
- Recognition that MBT can arise both as an additive/impurity and as neo‑formed MBT from MBTS during vulcanization; method measures total extractable MBT.
- Use as quality control, raw material evaluation, and R&D support; users must apply suitable safety and regulatory controls when handling extracts and reagents.
Typical use and users
Typical users are industrial and commercial rubber testing laboratories, quality control teams at rubber and latex product manufacturers, raw‑material suppliers, regulatory or product‑safety laboratories, and R&D groups assessing formulation and processing effects on extractable MBT. The method is used for lot acceptance testing, supplier verification, and investigations of potential skin‑contact hazards.
Related standards
Standards referenced in context with D8411 include Test Method D1991 (potentiometric titration for MBT purity) and Test Method D5044 (determination of free MBT in MBTS). D8411 is part of the ASTM D11 subcommittee series addressing rubber compounding materials and related analytical procedures.
Keywords
MBT, 2‑mercaptobenzothiazole, MBTS, HPLC, rubber compounding materials, extractable content, vulcanization, quality control, bioavailability, rubber testing.
FAQ
Q: What is this standard?
A: ASTM D8411‑21 is a short test method that defines a laboratory procedure to extract and quantify 2‑mercaptobenzothiazole (MBT) from cured rubber using HPLC. It is intended to measure the extractable (potentially bioavailable) MBT fraction for safety and QC purposes.
Q: What does it cover?
A: It covers sample extraction from rubber, chromatographic analysis by HPLC, calibration and reporting of MBT concentration, and notes on interpretation (including MBT formed from MBTS during vulcanization). It does not cover all laboratory safety practices or broader regulatory requirements.
Q: Who typically uses it?
A: Rubber manufacturers, contract testing laboratories, raw‑material suppliers, product safety and regulatory testing groups, and R&D labs concerned with accelerator residues and extractables.
Q: Is it current or superseded?
A: As of its designation (D8411‑21) the standard is published and listed as active (2021 edition). Users should confirm the current status via ASTM or their standards provider before relying on it for regulatory compliance.
Q: Is it part of a series?
A: Yes — it is part of the ASTM D11 series addressing rubber compounding materials and is related to other test methods such as D1991 and D5044 that deal with MBT/MBTS analysis and raw‑material evaluation.
Q: What are the key keywords?
A: MBT, MBTS, HPLC, rubber, extractable, vulcanization, quality control, bioavailability.