ASTM D2061 is a widely recognized standard developed by the American Society for Testing and Materials (ASTM) that specifies the test methods for evaluating the strength properties of zippers. These test methods are used to assess the tensile strength, seam strength, and resistance to cutting of zippers.

The standard includes the following test methods:

1. Tensile Strength Test: This test determines the maximum tensile force a zipper can withstand before breaking. The zipper specimen is securely clamped in grips, and a controlled tensile force is applied until the specimen ruptures. The maximum force applied is recorded, and the tensile strength is calculated by dividing this force by the cross-sectional area of the specimen.

2. Burst Strength Test: This test evaluates the resistance of a zipper to bursting when subjected to a specific force. The zipper is subjected to an increasing force until it bursts. The maximum force applied is recorded as the burst strength.

3. Seam Strength Test: This test measures the strength of the stitches or seams holding the zipper tape to the garment or other fabric. The specimen is attached to a seam strength testing machine, and a constant rate of tensile force is applied until the seam fails. The maximum force applied is recorded, and the seam strength is calculated by dividing this force by the width of the seam.

4. Cutting Strength Test: This test assesses the resistance of the zipper tape to cutting. The zipper tape is subjected to a cutting force using a specified cutting device. The force required to cut through the tape is recorded as the cutting strength.

These test methods provide valuable information for quality control, product development, and comparison of different zipper materials and constructions. It is important to follow the specific procedures outlined in ASTM D2061 to ensure accurate and reliable test results.

Please note that the above information is a general summary of ASTM D2061. For detailed instructions and requirements, it is recommended to refer to the latest version of the standard.