EN ISO 22553-9:2021 PDF

Overview

EN ISO 22553-9:2021 (ISO 22553-9:2020) defines a laboratory method to determine the volatile-matter content (stoving loss) of electro-deposition coatings (e-coats) during stoving. The standard is applicable to e-coats used in the automotive sector and other industrial products (chillers, radiators, consumer goods, aerospace, agriculture). It specifies test panels, apparatus, a repeatable procedure and the calculation for reporting stoving loss as a mass fraction (percent).

Key topics and technical requirements

• Scope and purpose: Measure the mass loss of an e-coat during thermal curing (stoving) to quantify volatile content and reaction-related loss.
• Test principle: Determine non-volatile matter after stoving; calculate stoving loss as (mass loss after stoving / mass of applied e-coat) × 100.
• Apparatus & accuracy:
  • Laboratory deposition system with tank recirculation and DC supply
  • Analytical balance (accuracy 0.0001 g)
  • Oven capable of holding specified object temperature (±2 °C up to 150 °C; ±3.5 °C between 150–200 °C)
  • Thermometer (0.1 °C), timer, ammeter
• Test panels: Electrically conductive, pre-treated panels per ISO 1514, approximately 190 mm × 105 mm × 0.75 mm.
• Procedure:
  • Deposit e-coat in a controlled laboratory bath (temperature typically 25–35 °C)
  • Rinse, pre-dry (≈110 °C for ~60 min), weigh, then stove at the agreed object temperature and time
  • Carry out each determination in triplicate (mean or median may be used)
• Evaluation & reporting:
  • Calculate stoving loss (%) from measured masses
  • Test report must include product ID, tank voltage/temperature, application and stoving times/temperatures, results, deviations and anomalies
• Precision: No precision data is currently available in the document.

Practical applications and users

This standard is intended for:

• Coating formulators evaluating solvent/volatile behavior during cure
• Automotive and industrial QA/QC labs verifying e-coat specifications
• R&D teams optimizing bake schedules and cure chemistry
• Third‑party testing organizations and certification bodies Understanding stoving loss helps optimize cure cycles, ensure regulatory compliance for VOC/volatile content, and improve coating performance and cost-efficiency.

Related standards

• ISO 22553-1 - Vocabulary for electro-deposition coatings
• ISO 1514 - Standard panels for testing
• ISO 4618 - Terms and definitions (paints and varnishes)
• ISO 23321 - Demineralized water for industrial applications

Keywords: EN ISO 22553-9:2021, ISO 22553-9, e-coat stoving loss, electro-deposition coatings, volatile-matter content, stoving test method, paints and varnishes.