ISO 12219-9:2019

Overview

ISO 12219-9:2019 - Interior air of road vehicles - Part 9 defines the large bag method for measuring emissions of volatile organic compounds (VOCs), formaldehyde and other carbonyl compounds from vehicle interior parts. Intended as a routine screening method, it evaluates large new parts and complete assemblies (e.g., instrument panels, seats) by enclosing them in a low-emitting sampling bag, heating under controlled conditions, sampling the bag air and calculating emitted concentrations (sampling bag values). The method is applicable to all vehicle types and provides a cost‑effective complement to other emission test methods.

Key topics and technical requirements

• Scope and purpose: Screening evaluation of new vehicle interior parts and assemblies to assess contribution to vehicle indoor air quality.
• Target analytes: VOCs (non‑polar and slightly polar, n‑C6 to n‑C16 range), formaldehyde and other carbonyl compounds.
• Principle: Place part in a large sampling bag, heat under specified conditions, collect a fraction of the bag gas, subtract bag blank values and calculate sampling bag values for target compounds.
• Sampling bags: Bags must be low‑emitting, low‑permeable and low‑sorption, with capacities typically 20 L to 2 000 L - size chosen relative to the test specimen.
• Apparatus: Thermostatic oven (for controlled heating), clean filling gas (nitrogen or air), pumps and integrating flow meter, analytical equipment per referenced standards.
• Analytical methods:
  • VOCs: Sorbent tubes (e.g., Tenax TA), thermal desorption and gas chromatography per ISO 16000‑6.
  • Formaldehyde/carbonyls: DNPH sorbent tubes and HPLC/UV per ISO 16000‑3.
• Quality assurance: Bag blank monitoring, recovery checks and reporting requirements are specified to ensure reproducibility and comparability.

Applications and users

• Automotive OEMs and suppliers for material selection, supplier evaluation and production quality control.
• Independent test laboratories performing routine emissions screening or client testing.
• Indoor air quality specialists and regulators assessing cabin air safety and compliance.
• Use cases include comparing similar components under standardized conditions, screening production batches, and pre‑selection of low‑emitting materials for vehicle interiors.

Related standards

• ISO 16000‑6 - Determination of VOCs in indoor and test chamber air (Tenax TA, thermal desorption + GC).
• ISO 16000‑3 - Determination of formaldehyde and other carbonyls (active sampling, DNPH + HPLC).
• ISO 12219 series - other parts cover alternate methods and related definitions for vehicle interior air testing.

Keywords: ISO 12219-9:2019, large bag method, VOC emissions, vehicle interior, formaldehyde, carbonyls, sampling bag, automotive emissions testing, indoor air quality.