ISO 22553-5:2019

Overview

ISO 22553-5:2019 specifies a laboratory method for the determination of sieve residue in electro-deposition coatings (e-coat). The test quantifies soiling material such as non-dispersed paint particles, clots or foreign matter (for example metal particles introduced with the object to be coated) that remain on a specified sieve after passing a known volume of e‑coat. The method is applicable to automotive and general industrial electro-deposition coatings (chillers, consumer products, radiators, aerospace, agriculture).

Key topics and technical requirements

• Principle: pass a specified volume of homogenized e-coat through a sieve and weigh the residue left on the sieve to report mass per volume (mg/L).
• Apparatus and materials: ordinary lab equipment plus
  • two plastic cups without bottoms (Ø ≈ 7 cm),
  • sieve cloth (mesh ≈ 30 µm, sieve size ≈ 10 × 10 cm, e.g., polyamide),
  • metal or glass weighing dish (Ø 8 ± 2 cm) resistant to ~110 °C,
  • metal paper clip, balance accurate to 1 mg,
  • demineralized water (per ISO 23321).
• Sample volume: minimum V = 2 L of homogenized e-coat is passed through the sieve.
• Procedure highlights:
  • Dry and weigh the sieve cloth assembly (m1).
  • Filter the specified e-coat volume through the mounted sieve, rinse residue with demineralized water, remove and dry the sieve assembly at 80 °C for 30 min, cool and weigh (m2).
  • Test performed in duplicate.
• Calculation: sieve residue d_sr = (m2 − m1) / V in mg/L.
• Reporting: include product identification, reference to ISO 22553-5:2019, test result, any deviations, unusual observations and test date.

Practical applications

• Quality control (QC) of e‑coat production lines to detect instability, coagulation or contamination that leads to filter clogging, sedimentation or coating defects.
• Root‑cause analysis when surface defects or process upsets are observed (e.g., metal debris from parts, clots).
• Supplier and incoming inspection for e-coat batches used across automotive, aerospace and industrial manufacturing.
• R&D and formulation stability testing to evaluate dispersion stability under different conditions.

Who should use this standard

• Laboratory technicians and QA teams in coating manufacturers and OEMs
• Process engineers and production managers in electro-deposition operations
• Coating formulators and materials scientists conducting stability evaluations
• Third‑party test labs offering e-coat analytics

Related standards

• ISO 22553 series (other parts covering e-coat vocabulary and methods)
• ISO 22553-1 (vocabulary)
• ISO 4618 (paints and varnishes - terms and definitions)
• ISO 23321 (demineralized water specification)

Keywords: ISO 22553-5:2019, electro-deposition coatings, e-coat, sieve residue, determination of sieve residue, paints and varnishes, e-coat quality control, sieve mesh 30 µm.