Overview
ASTM D6189-97(2022): Standard Practice for Evaluating the Efficiency of Chemical Removers for Organic Coatings provides a widely recognized methodology for assessing how effectively a chemical coatings remover can strip organic coatings such as paint, varnish, lacquer, shellac, and polyurethane from wood and metal surfaces. This ASTM standard enables manufacturers, product developers, and users to objectively compare the performance of paint strippers and similar chemical removers using a repeatable procedure.
Developed under the guidance of ASTM International, this standard aligns with internationally accepted principles and is relevant for both clear and pigmented coatings. While the procedure is valuable for laboratory testing, the results inform decisions in restoration, maintenance, and surface preparation industries.
Key Topics
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Scope of Evaluation
The standard is applicable to the testing of chemical coatings removers on both wood (solid or laminate) and metal substrates. It evaluates removers on single or multiple layers of organic coatings.
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Panel Preparation
Panels of standardized dimensions and material types (e.g., birch, oak, steel) are prepared and coated with one or more layers of finish under controlled conditions.
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Application Method
The chemical remover is applied using a brush, per the manufacturer’s instructions. After a specified dwell time, the loosened coating is removed with a plastic scraper.
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Performance Ratings
- Coating Removal Efficiency: Rated on a scale from 5 (100% removal) to 0 (no removal).
- Substrate Condition Post-removal: Rated from 5 (no effect) to 0 (complete failure), noting effects such as grain-raising or roughness for wood, and rusting or pitting for metals.
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Reporting Requirements
Results must include details of the coating and substrate, application method, removal time, efficiency rating, substrate condition, and any deviations from the standard procedure.
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Safety and Compliance Considerations
Users must ensure all appropriate safety, environmental, and regulatory measures are considered before conducting tests per this standard.
Applications
ASTM D6189-97(2022) is essential in:
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Product Development and Quality Control
Chemical manufacturers and formulators use the standard to benchmark and improve the effectiveness of paint and coatings removers.
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Comparative Testing
Enables laboratories to perform comparative assessments of different coatings remover products under consistent conditions.
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Surface Preparation in Restoration and Maintenance
Professionally evaluates products intended for stripping coatings in building renovation, automotive refinishing, furniture restoration, and manufacturing.
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Specification and Procurement
Ensures that coatings removers selected by contractors, restoration specialists, or end-users meet defined removal efficiency and substrate safety requirements.
Related Standards
Organizations utilizing ASTM D6189 for evaluating chemical removers for organic coatings will often reference additional ASTM standards to complete their testing protocols, such as:
- ASTM D609: Preparation of cold-rolled steel panels for testing coatings products
- ASTM D823: Practices for producing uniform films of paint and coatings on test panels
- ASTM D3924: Standard conditions for conditioning and testing paint, varnish, lacquer, and related materials
- ASTM E145: Specifications for gravity-convection and forced-ventilation ovens
These related standards establish the environmental and material conditions ensuring the reliability and repeatability of the efficiency evaluation.
Implementing ASTM D6189-97(2022) helps stakeholders in coatings removal and application industries to evaluate, compare, and select the most efficient and safe chemical removers for surface preparation, supporting quality, durability, and compliance in coatings projects.