ASTM E1731-95e1

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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e1
Designation: E 1731 – 95
Standard Test Method for
Gravimetric Determination of Nonvolatile Residue from
Cleanroom Gloves
This standard is issued under the fixed designation E 1731; 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 Air Force T.O. 00-25-203 Contamination Control of Aero-
space Facilities
1.1 This test method covers the determination of solvent
Mil-F-51068F Filters, Particulate (High Efficiency, Fire Re-
extractable nonvolatile residue (NVR) from gloves used in
sistant)
cleanrooms where spacecraft are assembled, cleaned, or tested.
Mil-P-27401 Propellant, Pressurizing Agent, Nitrogen
1.2 The values stated in SI units are to be regarded as
Mil-Std-105D Sampling Procedures and Tables for Inspec-
standard.
tion by Attributes
1.3 The NVR of interest is that which can be extracted from
Mil-Std-1246B Product Cleanliness Levels and Contamina-
gloves using a specified solvent that has been selected for its
tion Control Program
extracting qualities, or because it is representative of solvents
2.3 Federal Standards :
used in the particular facility. Alternative solvents may be used,
Fed Spec O-E-00760 Ethyl Alcohol
but since their use may result in different values being
Fed Std 209E Airborne Particulate Classes for Cleanrooms
generated, they must be identified in the procedure data sheet.
and Clean Zones
1.4 This standard does not purport to address all of the
2.4 Other Documents:
safety concerns, if any, associated with its use. It is the
IES-RP-CC005.2 Gloves and Finger Cots Used in Clean-
responsibility of the user of this standard to establish appro-
rooms and Other Controlled Environments
priate safety and health practices and determine the applica-
Industrial Ventilation, A Manual of Recommended Practice
bility of regulatory limitations prior to use.
3. Terminology
2. Referenced Documents
3.1 Definitions:
2.1 ASTM Standards:
3.1.1 contamination, n—unwanted molecular or particulate
D 1193 Specification for Reagent Water
matter that could affect or degrade the performance of the
F 24 Test Method for Measuring and Counting Particulate
components upon which they are deposited.
Contamination on Surfaces
3.1.2 contamination, n—a process of contaminant transport
F 50 Practice for Continuous Sizing and Counting of Air-
or accretion, or both.
borne Particles in Dust-Controlled Areas and Cleanrooms
3.1.3 environmentally controlled area, n—cleanrooms,
Using Instruments Capable of Detecting Single Sub-
clean facilities, controlled work areas, and other enclosures that
Micrometre and Larger Particles
are designed to protect hardware from contamination. Clean-
G 120 Test Method for Determination of Soluble Residual
liness is achieved by controlling airborne particulate matter,
Contamination in Materials and Components by Soxhlet
5 temperature, relative humidity, materials, garments, and per-
Extraction
sonnel activities. Guidelines for controlled areas can be found
2.2 Military Standards :
in Air Force T.O. 00-25-203 Table 3-1.
3.1.4 high effıciency particulate air (HEPA), n—a term
This test method is under the jurisdiction of ASTM Committee E-21 on Space
describing filters having an efficiency of 99.97 % for removal
Simulation and Applications of Space Technology and is the direct responsibility of
of 0.3-μm and larger particles. For this application, filters shall
Subcommittee E21.05 on Contamination.
meet the requirements of 2.3 and 6.1 of this test method.
Current edition approved Aug. 15, 1995. Published October 1995.
Annual Book of ASTM Standards, Vol 11.01. 3.1.5 molecular contaminant (nonparticulate), n—may be
Discontinued. See 1992 Annual Book of ASTM Standards, Vol 10.05.
in a gaseous, liquid, or solid state. It may be uniformly or
Annual Book of ASTM Standards, Vol 15.03.
nonuniformly distributed or be in the form of droplets. Mo-
Annual Book of ASTM Standards, Vol 14.02.
lecular contaminants account for most of the NVR.
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
E 1731
3.1.6 NVR, n—that quantity of molecular matter remaining 6.3 Solvent, Ethanol.
after the filtration of a solvent containing contaminants, and 6.4 Analytical Balance, 0.01-mg readability, 0.1-mg preci-
evaporation of the solvent at a specified temperature. sion. Capacity to be determined by the user.
3.1.7 particle (particulate contaminant), n—a piece of mat- 6.5 Vacuum Filtration System, 25-mm diameter, consisting
ter in a solid state, with observable length, width, and thick- of a membrane filter funnel and vacuum pump that will provide
ness. The size of a particle is defined by its greatest dimension a pressure of 250 torr (20 in. Hg vac.). Other size filters may be
and is expressed in micrometres. used as needed. All items that will come in contact with
solvents during analysis shall be made of glass, stainless steel,
4. Summary of Test Method
or other materials that will not affect the analysis via induced
contamination. Any house vacuum system may be used.
4.1 A glove to be tested is cut into several standard-sized
6.6 Solvent-Resistant Membrane Filters, Fluorocarbon,
pieces. The pieces are placed in a clean blanked container and
a measured volume of solvent is added to the container. (See 25-mm diameter, 0.2-μm nominal pore size. The use of
supported membrane filters is not recommended because of
Note 1.)
4.2 The container is placed in a heated ultrasonic cleaner, or possible adverse effects of the solvent on support media.
6.7 Teflon-Coated Tweezers, or Hemostat, unserrated tips.
a heated water bath, and heated (and agitated if in an ultrasonic
bath) for a specific length of time, after which the pieces of 6.8 Beakers, low form glass, 500 mL.
6.9 Laboratory Detergent, liquid.
glove are removed from the container.
4.3 The solvent in the container is filtered into another clean 6.10 Methanol, Reagent grade, A.C.S.
6.11 Acetone, Reagent grade, A.C.S.
container and allowed to evaporate to a low volume.
6.12 Deionized Water, organic free, Type II per Specifica-
4.4 The solvent is transferred to a clean preweighed weigh-
tion D 1193, with a minimum resistivity of 1.0 megohm-cm.
ing dish and evaporated to a constant weight.
6.13 Gloves, barrier type, low particle-generating, low out-
4.5 The results are expressed in mg/sq cm of glove surface
gassing, per IES-RP-CC005.2.
area or in mg/unit mass of glove sections.
6.14 NVR Solvent, acetone. Must be verified to contain no
4.6 A controlled blank shall be run on all solvents, filtration
more than 0.35-mg NVR per 300-mL solvent (0.12 mg/100
components, and all other equipment associated with the
mL) when tested in accordance with Section 8 of this test
analysis. In the event that more than one determination is run
method.
the same day, additional blanks will not be necessary, but will
rely on the value from the first test.
NOTE 2—Other solvents may be used if they are more representative of
4.7 NVR samples thus obtained may be used for analysis
service conditions, but the actual solvent used must be reported per
such as IR or FTIR if required.
Section 11 of this test method.
NOTE 1—Some cleanroom gloves are of a coated or layered construc- 6.15 Ultrasonic Tank, 5.7-L capacity nominal, with heater
tion or have different textures applied to the inside and outside surfaces.
capable of maintaining a temperature of 35 6 2°C, and cover
Because the inside and outside surfaces of these gloves may release
to position beakers in tank. Other convenient sizes may be
different quantities of nonvolatile residue, results using this method may
used.
not reflect the actual potential or transfer of contamination from this type
6.16 Evaporating Dishes, aluminum foil, 43-mm diameter.
of glove to hardware surfaces.
6.17 Drying Oven, stainless steel interior.
5. Significance and Use
7. Preparation of Equipment
5.1 The NVR obtained by this test method is that amount
7.1 All operation shall be performed
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