Long Term Storage
Validation of ESD Materials Supplier Compliance with ANSI/ESD Standards
Validation evaluates the material, package, workstation or equipment center to determine and certify (if requested by the Customer) so that your ESD requirements have been met by your supplier, distributor, manufacturer or customer.
Validation answers the question, "Are we in conformance with current ESD or Industry Standards when building our product?"
RMV Technology Group’s analytical and "hands on" approach provides an efficient, cost effective and broad-based expertise, in combination with engineering best practices, to verify as well as validate your engineered or advanced material, incoming or outgoing packaging, including equipment centers for compliance to current ESD and Industry Standards.
Accelerated Aging - Part I Long Term Storage of Product with ESD Materials Requires Validation
Part I. Accelerated Aging per MIL-PRF-81705E-2010
Mil-PRF-81705E w/AMENDMENT 1 (8 February 2010) requires Surface Resistivity (converted to Surface Volume Resistance), Shielding and Static Decay. Testing to ANSI/ESD STM11.11-2006 & STM11.12 or ASTM D257, ANSI/ESD STM11.31 and Mil-STD-3010C to simulate long-term storage or use.
Polycarbonate Compatibility Part II. ANSI/EIA-564-1992
Five EIA-564 specified stress levels can be required while the specimens are subjected to oven conditioning using up to four temperature levels.
The polycarbonate specimens are first annealed and placed into strain jigs. The agent or material under consideration is applied or fabricated to make intimate contact with the polycarbonate specimens.
The samples are placed into the oven at a recommended maximum temperature.
Occasionally, specimens are conditioned at room temperature and evaluated before placement into the oven for exposure to heat.
After five days the sets are removed from the oven(s) and all specimens are visually inspected for crazing and cracking in comparison to an unstressed sample using microscopic mapping.
Test specimens are transparent injection molded polycarbonate IZOD bars per ASTM D256.
Clean handling techniques should be observed in the preparation and utilization of the polycarbonate specimens.
Temperature (Ref: EIA 564)
Maintain one set of exposed and strained polycarbonate bars at each temperature being evaluated, namely 730F, 1200F, 158°F and 185°F +/-2°F for five days.
Reapply agents that volatilize in order to maintain continued chemical exposure.
After five days, remove bars from the jigs, wipe clean and inspect visually for crazes and cracks.
Some organizations require testing at the maximum 185°F temperature only for 5 days using the strain jigs 1000, 1700, 2000, 2500 and 3400 psi. This serves as a “worst case” scenario at the 185F temperature level.
The polycarbonate bars (bent at various stress levels) and exposure of supplier's static packaging materials are then subjected to various temperatures for 5 days.
Said speciments are then analyzed for cracks or imperfections.
Contact Corrosivity - Test Method 3005 Mil-STD-3010B, 31 March 2008, Supersedes Mil-STD-3010A-18 August 2005
Mil-STD-3010B states: 18.104.22.168.4 Exposure. In all cases, the specimen and test surface so arranged shall be exposed for ½ hour in air, maintained at a temperature of 1500 ± 5 °F, followed immediately by exposure in air at 1200 ± 2 °F and 650 ± 3 percent relative humidity for 20 hours. At the end of the exposure period, the specimens shall be separated from the test surface that shall be immediately examined for evidence of corrosion. Note for each area – the one covered by the specimen, and the other not covered – whether or not corrosion occurred and a description including the severity and distribution of any corrosion.
Some organizations will modify this test by using the actual material that a specimen would make intimate contact with during use.
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