Overview - ISO 17052:2007 (raw rubber, thermal desorption GC)
ISO 17052:2007 specifies a solvent‑free thermal desorption (dynamic headspace) method to determine residual monomers and other volatile low‑molecular‑mass compounds in raw rubber. The method concentrates volatile organic compounds (VOCs) from a small test piece, traps them on a cold trap, and transfers them into a capillary column gas chromatograph (GC) with appropriate detection (typically FID). The scope covers residual monomers, solvents and other compounds in the boiling‑point range roughly equivalent to C4–C12 hydrocarbons. The method’s stated limit of detection is 1 µg/g.
Key topics and technical requirements
- Principle: Dynamic headspace (thermal desorption) - heat a test piece under an inert carrier gas, capture emitted volatiles on a cold trap, then rapidly desorb into a capillary GC for separation and quantification.
- Sample preparation: Representative sampling per ISO 1795; bulk test sample ~250 g; typical test piece prepared from that sample (about 0.25 g) then subsampled (~0.05 g) and cut to small pieces (~0.5 mm) for desorption.
- Apparatus & consumables: GC with capillary column, thermal desorption system, flame ionization detector (FID), high‑purity carrier gases (N2, He or H2), analytical balance (±0.0001 g), 20 ml vials/desorption tubes, microvolume syringe (1 µl).
- Calibration & quantification:
- Use either the analyte as calibrant or a substitute with a determined relative response factor (RRF).
- Stock solutions commonly prepared at 1 % and/or 5 %; initial five‑point calibration recommended (1–1 000 µg/g range if unknown), thereafter a one‑point check is acceptable.
- Injection of 1 µl of calibration solution into desorption tube; calculation uses peak areas, injected concentration and RRF.
- Quality checks: Blank runs, system conditioning, and repeat desorption on the same piece to confirm complete desorption.
- Annexes: Annex A - test details for butadiene‑containing rubbers (BR, SBR, NBR). Annex B - details for rubbers without butadiene (EPDM, EOM). Annex C provides precision information.
Applications and users
- Who uses it: rubber manufacturers, quality control and analytical laboratories, polymer chemists, regulatory and environmental testing labs concerned with VOC emissions and workplace exposures.
- Practical applications:
- Monitoring residual monomer levels for product safety and regulatory compliance.
- Evaluating raw rubber batches for unwanted solvents or low‑molecular impurities.
- Supporting emission inventories and occupational exposure assessments in rubber processing.
- Advantages: solvent‑free analysis, preconcentration of volatiles, precise and reproducible sample introduction to the GC - suitable for trace‑level detection.
Related standards
- ISO 1795 - Sampling and preparative procedures for raw natural and synthetic rubber
- ISO 2393 - Rubber test mixes: preparation and mixing equipment/procedures
- ISO 23529 - Preparing and conditioning test pieces for physical test methods
Keywords: ISO 17052, residual monomers, thermal desorption, dynamic headspace, gas chromatography, raw rubber, volatile organic compounds, capillary column, VOC detection, rubber testing.