A screening procedure is provided for evaluating the susceptibility of plastics to environmental stress cracking by testing their resistance to pure solvents or their mixtures. The effect of complex chemical mixtures with unknown or suspect components, which may be encountered in the polymer's environment can be evaluated. Appendix A lists chemicals intended only to serve as a guide and does not exclude any chemical that may represent the environment the polymer is subjected to in a specific application. The user of the document is recommended to choose the appropriate solvents relevant to the actual application environment as specific environment and exposure conditions are application dependent and could vary significantly from one application to another.