ASTM E1731-95(2001)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:E1731–95 (Reapproved 2001)
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.
1. Scope MIL-P-27401 Propellant, Pressurizing Agent, Nitrogen
MIL-STD-105D Sampling Procedures and Tables for In-
1.1 This test method covers the determination of solvent
spection by Attributes
extractable nonvolatile residue (NVR) from gloves used in
MIL-STD-1246B Product Cleanliness Levels and Contami-
cleanrooms where spacecraft are assembled, cleaned, or tested.
nation Control Program
1.2 The values stated in SI units are to be regarded as
2.3 Federal Standards :
standard.
Fed Spec O-E-00760 Ethyl Alcohol
1.3 The NVR of interest is that which can be extracted from
Fed Std 209E Airborne Particulate Classes for Cleanrooms
gloves using a specified solvent that has been selected for its
and Clean Zones
extracting qualities, or because it is representative of solvents
2.4 Other Documents:
usedintheparticularfacility.Alternativesolventsmaybeused,
IES-RP-CC005.2 Gloves and Finger Cots Used in Clean-
but since their use may result in different values being
rooms and Other Controlled Environments
generated, they must be identified in the procedure data sheet.
Industrial Ventilation, A Manual of Recommended Prac-
1.4 This standard does not purport to address all of the
tice
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 contamination, n—unwanted molecular or particulate
2. Referenced Documents matter that could affect or degrade the performance of the
components upon which they are deposited.
2.1 ASTM Standards:
3.1.2 contamination, n—a process of contaminant transport
D 1193 Specification for Reagent Water
or accretion, or both.
F 24 Test Method for Measuring and Counting Particulate
3.1.3 environmentally controlled area, n—cleanrooms,
Contamination on Surfaces
cleanfacilities,controlledworkareas,andotherenclosuresthat
F 50 Practice for Continuous Sizing and Counting of Air-
are designed to protect hardware from contamination. Clean-
borne Particles in Dust-Controlled Areas and Cleanrooms
liness is achieved by controlling airborne particulate matter,
Using Instruments Capable of Detecting Single Sub-
temperature, relative humidity, materials, garments, and per-
Micrometre and Larger Particles
sonnel activities. Guidelines for controlled areas can be found
G 120 Practice for Determination of Soluble Residual Con-
in Air Force T.O. 00-25-203 Table 3-1.
tamination by Soxhlet Extraction
5 3.1.4 high effıciency particulate air (HEPA), n—a term
2.2 Military Standards :
describing filters having an efficiency of 99.97 % for removal
Air Force T.O. 00-25-203 Contamination Control of Aero-
of 0.3-µm and larger particles. For this application, filters shall
space Facilities
meet the requirements of 2.3 and 6.1 of this test method.
MIL-F-51068F Filters, Particulate (High Efficiency, Fire
3.1.5 molecular contaminant (nonparticulate), n—may be
Resistant)
in a gaseous, liquid, or solid state. It may be uniformly or
nonuniformly distributed or be in the form of droplets. Mo-
lecular contaminants account for most of the NVR.
This test method is under the jurisdiction of ASTM Committee E21 on Space
Simulation andApplications of Space Technology and is the direct responsibility of
Subcommittee E21.05 on Contamination.
Current edition approved Aug. 15, 1995. Published October 1995.
2 6
Annual Book of ASTM Standards, Vol 11.01. Available from the Institute of Environmental Sciences, 940 E. Northwest
Annual Book of ASTM Standards, Vol 15.03. Hwy., Mount Prospect, IL 60056.
4 7
Annual Book of ASTM Standards, Vol 14.04. Available from Committee on Industrial Ventilation, American Conference of
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700 Governmental Industrial Hygienists, 1330 Kemper Meadow Dr., Suite 600, Cincin-
Robbins Ave., Philadelphia, PA 19111-5098, Attn: NPODS. nati, OH 45240.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E1731
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- ofamembranefilterfunnelandvacuumpumpthatwillprovide
ness. The size of a particle is defined by its greatest dimension apressureof250torr(20in.Hgvac.).Othersizefiltersmaybe
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
4.1 A glove to be tested is cut into several standard-sized contamination. Any house vacuum system may be used.
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
6.8 Beakers, low form glass, 500 mL.
bath) for a specific length of time, after which the pieces of
6.9 Laboratory Detergent, liquid.
glove are removed from the container.
6.10 Methanol, Reagent grade, A.C.S.
4.3 The solvent in the container is filtered into another clean
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 Acontrolled 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
the same day, additional blanks will not be necessary, but will method.
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 operatio
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