1.1 This test method describes test methods to measure the potential of process support materials to deposit nonvolatile residues (NVR) on hardware surfaces by dry contact transfer. Process support materials may include items such as gloves, wipers, garments, packaging materials, and other polymeric films. 1.2 This test method provides two test methods to evaluate dry contact transfer: 1.2.1 Method A--Direct Contact with FT-IR Crystal--This test method uses direct contact of the test item with an infrared crystal and analysis of the resulting residue by Fourier transform infrared (FT-IR) spectroscopy with attenuated total reflectance (ATR) accessories for rapid assessment of the potential for dry contact transfer and qualitative identification of deposited species. 1.2.2 Method B--Gravimetric Method--This test method involves the gravimetric measurement of residue deposited by the test item on an aluminum witness surface under specified time, temperature, and applied pressure conditions. This tes tmethod provides a quantitative measurement of dry contact transfer that may be used for comparison of process support materials. The collected residue may then be identified by FT-IR analysis. 1.3 This test method specifies the methods used for the determination of NVR chemical species but not the methods for operating the equipment. 1.4 This test method does not provide criteria for acceptance or rejection of a material. 1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
NASA uses more than one method to measure dry contact transfer of nonvolatile residue. A standard method for preparing and measuring samples will aid industry in meeting NASA and DoD sponsor desires for comparing materials.
Keywordscontact transfer; contamination; infrared spectroscopy; nonvolatile residue; NVR; FT-IR; gravimetric analysis
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top