ASTM E1234-95e1

Standard Practice for Handling, Transporting, and Installing Nonvolatile Residue (NVR) Sample Plates Used in Environmentally Controlled Areas for Spacecraft

SCOPE
1.1. This practice covers the handling, transporting, and installing of sample plates used for the gravimetric determination of nonvolatile residue (NVR) within and between facilities.
1.2 The values stated in SI units are to be regarded as the standard.
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.

General Information

• Status: Historical
• Publication Date: 09-May-2001
• ICS: 49.025.01 - Materials for aerospace construction in general
• ICS: 49.140 - Space systems and operations
• Technical Committee: E21 - Space Simulation and Applications of Space Technology
• Drafting Committee: E21.05 - Contamination

Relations

• Replaced By: ASTM E1234-01 - Standard Practice for Handling, Transporting, and Installing Nonvolatile Residue (NVR) Sample Plates Used in Environmentally Controlled Areas for Spacecraft
• Effective Date: 10-May-2001
• Referred By: ASTM E1235-12(2020)e1 - Standard Test Method for Gravimetric Determination of Nonvolatile Residue (NVR) in Environmentally Controlled Areas for Spacecraft
• Effective Date: 10-May-2001
• Referred By: ASTM E2352-19 - Standard Practice for Aerospace Cleanrooms and Associated Controlled Environments—Cleanroom Operations
• Effective Date: 10-May-2001
• Referred By: ASTM E2217-12(2019) - Standard Practice for Design and Construction of Aerospace Cleanrooms and Contamination Controlled Areas
• Effective Date: 10-May-2001
• Referred By: ASTM E2312-11(2019) - Standard Practice for Tests of Cleanroom Materials
• Effective Date: 10-May-2001
• Referred By: ASTM E2900-19 - Standard Practice for Spacecraft Hardware Thermal Vacuum Bakeout
• Effective Date: 10-May-2001
• Referred By: ASTM E2042/E2042M-09(2021) - Standard Practice for Cleaning and Maintaining Controlled Areas and Clean Rooms
• Effective Date: 10-May-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
e1
Designation: E 1234 – 95
Standard Practice for
Handling, Transporting, and Installing Nonvolatile Residue
(NVR) Sample Plates Used in Environmentally Controlled
Areas for Spacecraft
This standard is issued under the fixed designation E 1234; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
e NOTE—To bring Subcommittee E21.05’s existing standards into compliance with Part H of ASTM’s Form and Style Manual,
the M designation has been editorially removed in July 2000.
1. Scope nation Control Program.
2.4 Institute of Environmental Sciences:
1.1 This practice covers the handling, transporting, and
IES-RP-CC001.3 HEPA and ULPA Filters
installing of sample plates used for the gravimetric determina-
IES-RP-CC006.2 Testing Cleanrooms
tion of nonvolatile residue (NVR) within and between facili-
IES-RP-CC016 The Rate of Deposition of Nonvolatile
ties.
Residue in Cleanrooms
1.2 The values stated in SI units are to be regarded as the
2.5 American National Standards Institute:
standard.
ANSI/ASME B46.1-1985 Surface Texture (Surface Rough-
1.3 This standard does not purport to address all of the
ness, Waviness, and Lay)
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3. Terminology
priate safety and health practices and determine the applica-
3.1 Definitions:
bility of regulatory limitations prior to use.
3.1.1 air cleanliness class (airborne particulate cleanliness
2. Referenced Documents class), n—the level of cleanliness specified by the maximum
allowable number of particles per cubic meter (cubic foot) of
2.1 ASTM Standards:
air as defined in FED-STD-209.
E 1235 Test Method for Gravimetric Determination of Non-
3.1.2 clean area, n—a general term that includes clean-
volatile Residue (NVR) in Environmentally Controlled
rooms, controlled areas, good housekeeping areas, and other
Areas for Spacecraft
areas that have contamination control by physical design and
F 50 Practice for Continuous Sizing and Counting of Air-
specified operating procedures.
borne Particles in Dust-Controlled Areas and Cleanrooms
3.1.3 clean zone, n—a defined space in which the contami-
Using Instruments Capable of Detecting Single Sub-
nation is controlled to meet specified cleanliness levels.
Micrometre and Larger Particles
3.1.4 contaminant, n—unwanted molecular and particulate
2.2 U.S. Federal Standard:
matter that could affect or degrade the performance of the
FED-STD-209 Airborne Particulate Cleanliness Classes in
components upon which they reside.
Cleanrooms and Clean Zones.
3 3.1.5 contamination, n—a process of contaminating.
2.3 U.S. Department of Defense Standards:
3.1.6 controlled area, n—an environmentally controlled
MIL-F-51068F Filters, Particulate (High-Efficiency Fire
area, operated as a cleanroom, but without the final stage of
Resistant)
HEPA (or better) filters used in cleanrooms.
Air Force TO 00-25-203, 1 Dec. 1972, Change 15, 24 Oct.
3.1.6.1 Discussion—Only rough filters (50 to 60 % effi-
1992, Contamination Control of Aerospace Facilities, U.S.
ciency) and medium efficiency filters (80 to 85 % efficiency)
Air Force.
are required for a controlled area. (See Air Force T.O. 00-25-
MIL-STD-1246 Product Cleanliness Levels and Contami-
203.) The maximum allowable airborne particle concentrations
are Class M7 (283 000) area for particles $0.5 μm and Class
M6.5 (100 000) for particles $5.0 μm.
This practice is under the jurisdiction of ASTM Committee E-21 on Space
Simulation and Applications of Space Technology and is the responsibility of 3.1.7 environmentally controlled areas, n—cleanrooms,
Subcommittee E21.05 on Contamination.
Current edition approved Aug. 15, 1995. Published October 1995. Originally
published as E 1234 – 88. Last previous edition E 1234 – 88 (1993). Available from Institute of Environmental Sciences, 940 E. Northwest High-
Annual Book of ASTM Standards, Vol 15.03. way, Mount Prospect, IL 60056.
3 5
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Available from American Society of Mechanical Engineers, United Engineer-
Robbins Ave., Philadelphia, PA, 19111-5094, Attn.: NPODS. ing Center, 345 E. 47th St., New York, NY 10017.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
E 1234
controlled areas, good housekeeping areas, and other enclo- 4.7 One of the NVR plates is removed from the carrier, the
sures that are designed to protect products from contamination. cover is removed, the cover is replaced, and the plate is
3.1.7.1 Discussion—Cleanliness is achieved by controlling returned to the carrier. This NVR plate is handled in the same
air purity, temperature, humidity, materials, garments, and manner as the exposed plates. This plate is designated as the
personnel activities. blank or control sample.
3.1.8 facility (clean facility), n—the total real property 4.8 After exposure, the NVR plates are removed from their
required to accomplish the cleanroom functions. locations in the clean area and are replaced with clean NVR
3.1.9 good housekeeping area, n—an environmentally con- plates in accordance with the facility and clean area contami-
trolled area without quantitative cleanliness requirements but nation control plan, operating procedures, and other official
maintained in a visibly clean condition. documents.
3.1.9.1 Discussion—Office, laboratory, and storage areas 4.9 The exposed plates are covered and placed into the
with air conditioning and janitorial service are typical of good original NVR plate carrier, returned to the analysis laboratory,
housekeeping areas. and processed in accordance with Test Method E 1235.
3.1.10 HEPA (high effıciency particulate air) filter, n—a
5. Apparatus and Materials
filter for air with a removal efficiency in excess of 99.97 % for
0.3-μm sized particles. 5.1 NVR Plate, Type 316 corrosion resistant steel with an
2 2
3.1.10.1 Discussion—For this application, HEPA filters area of approximately 0.1 m (1 ft ). The plate shown in Fig. 1
shall meet the requirements of MIL-F-51068F and paragraph has been found to be satisfactory. The surface texture of the
6.8 of this practice. sampling surface shall be 0.80 μm (32 μin.) or better per
3.1.11 molecular contaminant—nonparticulate contami-
ANSI/ASME B46.1. The plate shall be electropolished and
nant, n—nonparticulate matter. engraved with an identification number.
3.1.11.1 Discussion—The molecular contaminant may be in
5.2 NVR Plate Cover, Type 316 corrosion resistant steel.
a gaseous, liquid, or solid state. It may be uniformly or The cover shown in Fig. 2 has been found to be satisfactory.
nonuniformly distributed, or be in the form of droplets.
The surface texture shall be 0.80 μm (32 μin.) or better per
Molecular contaminants account for most of the NVR. ANSI/ASME B46.1.
3.1.12 NVR (nonvolatile residue), n—quantity of residual
5.3 Noncontaminating Nylon Bag to enclose each covered
soluble, suspended, and particulate matter remaining after the NVR plate.
controlled evaporation of a volatile liquid at a specified
5.3.1 Bags shall meet the safety and outgassing require-
temperature. ments for the spacecraft and spacecraft processing facility and
3.1.12.1 Discussion—The liquid is usually filtered through
shall not contain or generate molecular or particulate matter
a membrane filter, of a specified size, before evaporation. The that could contaminate the NVR plate or NVR plate carrier.
process used to determine the NVR may affect the quantitative 5.4 NVR Plate Carrier—The sealable, aluminum carrier
measurement. Process factors include filter size, solvent, and shown in Fig. 3 has been found to be satisfactory. The carrier
the evaporation temperature and atmosphere. For this reason, shall be constructed so as to prevent cross contamination
the process must be defined. between plates.
3.1.13 particle (particulate contaminant), n—a piece of 5.5 Noncontaminating Nylon Bag to protect the NVR plate
matter in a solid or liquid (droplet) state with observable carrier in 5.4 nylon film material shall meet the safety and
length, width, and thickness. The size of a particle is usually outgassing requirements for the spacecraft and spacecraft
defined by its greatest dimension and is specified in microme- processing facility. (See Note 2.)
tres. 5.6 HEPA filtered, Class M 3.5 (Class 100), or better
environment, as defined in FED-STD-209, unidirectional air
4. Summary of Practice
flow, clean work station.
4.1 Covered, stainless steel, NVR plates are transported in a
5.7 Gloves, solvent compatible and resistant. (Warning—
sealed carrier within an outer nylon bag to the facility that is to
Gloves shall be used to protect the hands from accidental spills
be monitored for NVR deposition.
of the NVR solvent and minimize contamination of exposed
4.2 The outer bag is removed from the plate carrier within
samples. Gloves shall be selected to meet local safety and
the entrance air lock of the cleanroom, controlled area, or other
contamination control requirements.)
environmentally controlled area in accordance with the opera-
5.8 Oil-Free Aluminum Foil, to cover the NVR plate if the
tional procedures for that facility and associated clean areas.
cover in 6.2 is not used.
4.3 The clean NVR plate carrier is taken into the clean area.
5.9 HEPA Filters—All HEPA filters shall be constructed of
4.4 Locations for attaching the plates within the clean area
low outgassing, corrosion
...