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D2059 – Standard Test Method Technical Guide
📐 Scope and Referenced Standards
Designation D2059/D2059M −03 (Reapproved 2022) provides a standardized test method for evaluating the resistance of zippers to corrosion in a salt spray (fog) environment, using the apparatus specified in Practice B117. As stated in Section 1.1, this method applies to all types of zippers, assessing both corrosion resistance and functional operability after exposure.
A critical requirement from Section 1.2 is that SI units and inch-pound units must be treated as separate standards. Combining values from the two systems constitutes non-conformance. Furthermore, the user is responsible for establishing safety, health, and environmental protocols (Section 1.3).
⚙️ Summary of Test Method and Significance
The Summary of Test Method (Section 4) outlines a controlled procedure where the effects of corrosion are evaluated both visually and by measuring the crosswise strength and the force required to open and close the zipper. These measurements are taken before and after exposure to the prescribed salt-spray atmosphere for a specified duration.
Section 5 on Significance and Use emphasizes that while the results of D2059 are indicative of performance in other corrosive conditions and cannot precisely predict field exposure, they are highly valuable for controlling manufacturing processes and assessing the effectiveness of protective coatings.
⚠️ Important Note on Correlation: Per Section 5.1, the results of exposure to the salt spray are “merely indicative of the reaction to other corrosive conditions.” They “cannot be related precisely to a given length of exposure in a specific atmosphere.” This test serves as a controlled comparative benchmark, not an absolute in-service lifetime predictor.
📊 Key Evaluated Properties and Referenced Standards
The standard relies on a comprehensive suite of ASTM methods for defining, measuring, and verifying zipper properties. The following tables outline the key supporting standards and the primary evaluation metrics.
Referenced Standards for Zipper Assessment
| 🟦 Referenced Standard | 📏 Scope of Associated Test |
|---|---|
| B117 | Operating Salt Spray (Fog) Apparatus |
| D2061 | Strength Tests for Zippers (Crosswise Strength) |
| D2062 | Operability of Zippers (Force to Open/Close) |
| D2051 / D2058 | Durability of Finish to Laundering / Drycleaning |
| D2052 / D2053 / D2054 / D2057 | Colorfastness to Drycleaning, Light, Crocking, and Laundering |
| D2060 | Measuring Zipper Dimensions |
| D2050 / D123 | Terminology for Subassemblies and Textiles |
📥 Standard Documents Download |