ASTM E2361

ASTM E2361 is the ASTM standard guide for testing leave-on products using in-situ methods, offering a structured approach for evaluating product performance in place on the skin or relevant test surface. It is intended to help users apply consistent testing practices when assessing leave-on formulations, supporting more reliable product development, comparative evaluation, and technical decision-making. For organizations working with topical products, this guide can serve as an important reference for test planning and data interpretation.

Overview of ASTM E2361

ASTM E2361 provides guidance for testing leave-on products with in-situ methods, which generally means evaluating product behavior or performance without removing it from the test site during the measurement process. The standard is relevant where controlled, repeatable testing is needed for products designed to remain on the surface after application. As an ASTM standard, it supports more consistent technical communication and can help align testing practices across development, quality, and evaluation workflows.

Common use cases of ASTM E2361

This standard is commonly used when testing leave-on formulations such as lotions, creams, or other topical products that are intended to remain on the skin after application. It may be used in product development, comparative testing, or performance assessment where in-situ measurement is preferred. ASTM E2361 is also useful for laboratories and technical teams seeking a defined method guide for consistent evaluation, especially when documenting product behavior under controlled conditions.

Benefits of using ASTM E2361

Using ASTM E2361 can help improve consistency in testing leave-on products and support clearer comparisons between formulations. It may also be valuable for quality control, procurement decisions, and product claims support because it provides a recognized technical framework for in-situ testing. By following a standard guide, organizations can reduce ambiguity in test setup and reporting, which may improve confidence in results and streamline internal or external review.

• Guidance for in-situ testing methods
• Focused on leave-on product evaluation
• Supports consistent test planning
• Useful for comparative performance work
• Helps standardize reporting and review