Internal stress exists as an inherent force within electroplated and chemically applied metallic deposits. This induced stress can be tensile or compressive in nature, causing the deposit to contract or expand in relation to the base material. High levels of stress in deposits produce micro-cracking and macro-cracking, and in severe cases produce a lack of deposit adhesion in the form of blistering, peeling, and flaking. Two ways to evaluate the internal deposit stress in metallic coatings are the bent strip Deposit Stress Analyzer and the Spiral Contractometer systems. These represent two stress test procedures that have approval status by the American Society for Testing Metals Standards.

For a calculating app that will work for both the Deposit Stress Analyzer System and the Spiral Contractometer System which will assist in solving the formulas click on this link: 

 https://play.google.com/store/apps/details?id=com.wordpress.zackleaman.specialtytestinganddevelopmentco .

Deposit Stress Analyzer System- ASTM Standard B975

                         The Deposit Stress Analyzer System can be used by most metal plating.

                                                         Some applications include:

  .                                               Military zinc, tin and cadmium plated deposits        Hard chrome plated deposits
   .                                              Decorative nickel chrome plated deposits               Electronics copper and nickel plated deposits

  .                                               Precious metal plated deposits                                Electroless chemically deposited metallic layers

  .                                               Engineered metal alloy plated deposits

Spiral Contractometer System- ASTM Standard B636

The Advantages                                                       The Improvements

Accurate repeatable results                                        Thread stripping is prevented

Easy centering of the Helix                                         Reduced calibration wheel friction

Easy centering of the anode basket                           25% glass filled Teflon construction

Holes at helix ends- no slippage                                Inside spiral surface is shielded

Simple and rapid calculations in English/ Metric        Minimal  deposit on helix interior

Guess steps are eliminated                                        Precise scale to arrow view

*Ordering on this website is for USA only.  We have Distributors in China, Europe, Hong Kong, Japan, Mexico, S. Korea, and Taiwan, see contact us page for information. All other countries may order from Specialty Testing and Development Company by e-mail, fax, or phone.  A $50.00 wire fee will be added to all international orders paid by bank wire transfer.

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Mission Statement:

Specialty Testing and Development Company’s mission is to provide the global manufacturing industry with accurate and cost effective methods and equipment for testing stress in applied metallic coatings.

Disclaimer:

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*If there is any damage due to shipping see our Return Policy.