Resistance Table - Plastics and Stainless Steel V4A

Significance of the topic

C hemical compatibility data are essential for selecting appropriate materials in environments exposed to aggressive solvents, acids, bases and oxidizers. The S.C.A.T. Europe resistance table supports engineers, laboratory personnel and QA/QC teams in industries such as chemical processing, pharmaceuticals and materials manufacturing to prevent equipment failure, reduce downtime and enhance safety.

Objectives and overview of the table

The main purpose of this reference is to present standardized resistance ratings for five widely used materials—PTFE, PEHD (high-density polyethylene), PP (polypropylene), PFA and stainless steel V4A—when in contact with over a hundred chemicals at 20 °C and various concentrations. This overview helps users identify compatible plastics and metals for pumps, valves, piping systems and storage vessels.

Methodology and data compilation

Data were compiled from up-to-date manufacturer specifications, expert sources and practical experience. The materials offering the highest corrosion resistance were selected for inclusion. Resistance is categorized as follows:

• A: Very good resistance after up to 30 days’ exposure, with no or only mild damage.
• B: Conditional resistance; damage such as hairline cracks or discoloration may occur after prolonged exposure.
• C: Poor resistance; risk of severe damage, deformation or destruction of the material.
• A/C: Potential for pitting corrosion or stress cracking under certain conditions.
• -: No data available.

Main findings and discussion

• PTFE and PFA consistently show A ratings against nearly all tested substances, including strong acids, bases, organic solvents and oxidizing agents.
• PEHD and PP exhibit good performance (A or B) with many aqueous solutions and moderate organics but are less suitable (B or C) for chlorinated solvents, aromatic hydrocarbons and aggressive oxidizers.
• Stainless steel V4A generally maintains high resistance (A or B) to many chemicals, though it may be susceptible to localized corrosion or stress-induced cracking (A/C) in highly oxidative or chloride-rich environments.

Benefits and practical applications

Using this table, technical teams can:

• Select materials that ensure long service life and process safety.
• Anticipate maintenance needs by understanding conditional resistance limits.
• Optimize equipment design for specific chemical exposures.

Future trends and potential applications

Advances in fluoropolymer formulations and coated alloys aim to broaden resistance profiles at elevated temperatures and with novel solvents. Integration of chemical compatibility databases into AI-driven selection tools will streamline material choice and support complex process design.

Conclusion

The S.C.A.T. Europe chemical resistance table offers a comprehensive, easy-to-use reference to guide material selection for handling aggressive fluids. By applying these resistance ratings, users can minimize risk, extend equipment lifespan and maintain high safety standards.

Reference

S.C.A.T. Europe GmbH. Chemical resistance table for plastics and stainless steel V4A. 2020.