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Ionic Residue Value Conversion from Metric to English

Question: Per J-STD-001D, paragraph 8.3.6.2, Static Extraction Method, the contamination shall be less than 1.56 micrograms/cm². What is the amount of allowable contamination per inches squared?

Answer: The conversion rate is 6.45cm² = 1 in². Therefore 1.56 mg equates to 1.56*6.45 = 10.06mg NaCl/in².