AIA/NAS 3447-2012 pdf download PRECISION CLEANED ITEMS, CONTAMINATION BARRIER FOR
SCOPE:This Standard provides a contamination barrier for retaining the required cleanness levels of precision1.0cleaned items.
REFERENCE:2.0
2.I General Packaging Standard NAS 850
2.2 General Packaging Standard Indexes NAS 851
3.0REQUIREMENTS
3.1General
3.1.1The required cleanness level for items shall be as specified on the design drawing or the procurementdocument.
3.1.2The required class of contamination barrier shall be as specified on the design drawing or thprocurement document .
CLASS
N45
MATERIAL
PolyethyleneAnti-static PolyethyleneNylon (Polyamide)Anti-static Nylon (Polyamide)Fluorohalocarbon (LOX Compatible)
3.1.3
All materials/devices in intimate contact with a significant surface or sealed within an intimatebarrier shall be as clean as required for the item, The material in direct contact with the itemshall not deposit contamination on the item to an extent greater than that permitted in the applicablecleanness requirements.
3,1,3,1Contamination Barrier – Plastic Film3,1.3,1.1Class l – Polyethylene: Material used for film or bag shall be 6 Mils thick,clear natural color, unprinted.
3,1.3,1.2Class 2 — Anti-static Polyethylene: Material used for film or bags shall be6 Mils thick， The material shall possess anti-gtatic properties; it shall have maximum surface resistivity of 2 x 10 ohm8,when tested in accordance with ASTMD257-66 and a maximum bleed-off of 2 seconds for 5,000 volts 8tatic electricity,when tested in accordance with Method 4046 of Federal Test Method Standard 101.
Class 3 – Nylon: Material used for film or bags shall be transparent thermoplastic,low sloughing nylon 6, 2 Mils thick.
3,1.3,1.3
Class 4 –nti-static Nylon! Material used for film or bags shall be transparentthermoplastic, low sloughing Nylon 6,2 Mils thick. The material shall possessanti-static properties; it shall have a maximum gurface resistivity of 2 x 10 ohmswhen tested in accordance with ASTM D257-66 and a maximum bleed-off of 2 seconds for5,000 volts static electricity, when tested in accordance with Method 4046 of FederalTest Method Standard 101.3,1.3,1.4

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