ASTM E1235

The NVR determined by this test method is that amount that can reasonably be expected to exist on hardware exposed in environmentally controlled areas.

The evaporation of the solvent at or near room temperature is to quantify the NVR that exists at room temperature.

Numerous other methods are being used to determine NVR. This test method is not intended to replace methods used for other applications.

1. Scope

1.1 This test method covers the determination of nonvolatile residue (NVR) fallout in environmentally controlled areas used for the assembly, testing, and processing of spacecraft.

1.2 The NVR of interest is that which is deposited on sampling plate surfaces at room temperature: it is left to the user to infer the relationship between the NVR found on the sampling plate surface and that found on any other surfaces.

1.3 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.

1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

2. Referenced Documents

D1193 Specification for Reagent Water
E1234 Practice for Handling, Transporting, and Installing Nonvolatile Residue (NVR) Sample Plates Used in Environmentally Controlled Areas for Spacecraft
F50 Practice for Continuous Sizing and Counting of Airborne Particles in Dust-Controlled Areas and Clean Rooms Using Instruments Capable of Detecting Single Sub-Micrometre and Larger Particles
14644-1 Cleanrooms and Associated Controlled Environments-Part 1: Classification of Air Cleanliness
14644-2 Cleanrooms and Associated Controlled Environments-Part 2: Specifications for Testing and Monitoring to Prove Continued Compliance with ISO 14644-1
14951-3 Space Systems-Fluid Characteristics-Part 3: Nitrogen
ANSI/ASME B46.1-1985 Surface Texture (Surface Roughness, Waviness, and Lay)
FED-STD-209E Airborne Particulate Cleanliness Classes in Cleanrooms and Clean Zones
IEST-RP-CC001.3 HEPA and ULPA Filters
IEST-RP-CC007.1 Testing ULPA Filters
IEST-RP-CC034.1 HEPA and ULPA Filter Leak Tests
IEST-STD-CC1246 Product Cleanliness Levels and Contamination Control Program
Industrial Ventilation, A Manual of Recommended Practice, Latest Edition
SMC-TR-95-28, , U.S. Air Force Space and Missile Systems Center, 1 March 1995

Index Terms

gravimetric determination; nonvolatile residue; Acid decomposition; Aerospace applications; Contamination--aerospace materials/applications; Environmental control/fate--aerospace applications; Gravimetric determination; Mass per unit area; Nonvolatile residue (NVR); Residue; ICS Number Code 49.025.01; 49.140

Citing ASTM Standards

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