ASTM D120-02a(2006)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D 120 – 02a (Reapproved 2006)
Standard Specification for
Rubber Insulating Gloves
This standard is issued under the fixed designation D 120; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope D 1149 Test Method for Rubber Deterioration—Surface
Ozone Cracking in a Chamber
1.1 This specification covers manufacturing and testing of
D 1415 Test Method for Rubber Property—International
rubber insulating gloves for protection of workers from elec-
Hardness
trical shock.
D 2240 Test Method for Rubber Property—Durometer
1.2 Two types of gloves are provided and are designated as
Hardness
Type I, non-resistant to ozone, and Type II, resistant to ozone.
D 2865 Practice for Calibration of Standards and Equip-
1.3 Six classes of gloves, differing in electrical characteris-
ment for Electrical Insulating Materials Testing
tics,areprovidedandaredesignatedasClass00,Class0,Class
F 819 Terminology Relating to Electrical Protective Equip-
1, Class 2, Class 3, and Class 4.
ment for Workers
1.4 The values stated in SI units are to be regarded as the
SI 10 Standard for Use of the International System of Units
standard. See ASTM SI 10.
(SI): The Modern Metric System
1.5 The following safety hazards caveat pertains only to the
test method portion, Sections 16, 17, 18, and 19, of this
3. Terminology
specification: This standard does not purport to address all of
3.1 Definitions:
the safety concerns, if any, associated with its use. It is the
3.1.1 color splash—a splash, smear, or streak of contrasting
responsibility of the user of this standard to establish appro-
color evident on the inside or outside surface of the gloves that
priate safety and health practices and determine the applica-
was deposited during the dipping operation and is vulcanized
bility of regulatory limitations prior to use. For specific
into the glove as part of the homogenous compound.
precaution statements, see 18.2.
3.1.2 glove cuff roll—the roll or reinforced edge of an
2. Referenced Documents insulating glove at the cuff.
2 3.1.3 halogenation treatment—exposure of the entire glove
2.1 ASTM Standards:
surface area to a halogen for the purpose of reducing surface
D 297 Test Methods for Rubber Products—Chemical
friction.
Analysis
3.1.4 ozone—a very active form of oxygen that may be
D 412 Test Methods for Vulcanized Rubber and Thermo-
produced by corona, arcing, or ultraviolet rays.
plastic Elastomers—Tension
3.1.5 user—the employer or entity purchasing the equip-
D 518 Test Method for Rubber Deterioration—Surface
ment to be utilized by workers for their protection; in the
Cracking
absence of such an employer or entity, the individual purchas-
D 573 Test Method for Rubber—Deterioration in an Air
ing and utilizing the protective equipment.
Oven
3.1.6 working area—allfingerandthumbcrotches,thepalm
D 624 Test Method for Tear Strength of Conventional
(area between the wrist and the base of the finger and thumb)
Vulcanized Rubber and Thermoplastic Elastomers
and the area of the finger and thumb facing the palm not
extending beyond the center line of the crotch. See Fig. 1.
This specification is under the jurisdiction of ASTM Committee F18 on
3.1.7 For definitions of other terms, refer to Terminology
Electrical Protective Equipment for Workers and is the direct responsibility of
F 819.
Subcommittee F18.15 onWorker Personal Equipment.This standard replacesANSI
Standard J 6.6, which is no longer available.
4. Significance and Use
Current edition approved Dec. 1, 2006. Published March 2007. Originally
approved in 1921. Last previous edition approved in 2002 as D 120 – 02a.
4.1 This specification covers the minimum electrical,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
chemical, and physical properties guaranteed by the manufac-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
turer and the detailed procedures by which such properties are
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. to be determined. The purchaser has the option to perform or
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 120 – 02a (2006)
FIG. 1 Working Area of a Rubber Insulating Glove
TABLE 1 Proof-Test/Use Voltage Relationship
4.4 It is common practice and the responsibility of the user
Maximum AC of this type of protective equipment to prepare complete
AC Proof-Test DC Proof-Test Maximum DC Use
A
Class of Glove Use Voltage
instructions and regulations to govern the correct and safe use
Voltage, rms, V Voltage, avg, V Voltage avg, V
ac rms, V
of such equipment.
00 2 500 500 10 000 750
0 5 000 1 000 20 000 1 500
5. Classification
1 10 000 7 500 40 000 11 250
5.1 Gloves covered under this specification shall be desig-
2 20 000 17 000 50 000 25 500
3 30 000 26 500 60 000 39 750
nated as Type I or Type II; Class 00, Class 0, Class 1, Class 2,
4 40 000 36 000 70 000 54 000
Class 3, or Class 4.
A
Except for Class 00 and 0 gloves, the AC maximum use voltage is based
RMS
5.1.1 Type I,non-resistanttoozone,madefromahigh-grade
on the following formula:
cis-1,4-polyisoprene rubber compound of natural or synthetic
Maximum AC use voltage (maximum nominal design voltage) = 0.95 ac proof-test
voltage − 2000 V
origin, properly vulcanized.
This formula takes into account the reduction in the volts per mil capability of the
5.1.2 Type II, ozone-resistant made of any elastomer or
glove with increasing thickness of the rubber.
combination of elastomeric compounds.
5.1.3 The class designation shall be based on the electrical
have performed any of these tests in order to verify the
properties as shown in Table 2 and Table 3.
guarantee. Claims for failure to meet the specification are
6. Ordering Information
subject to verification by the manufacturer.
4.2 Gloves are used for personal protection; therefore, when
6.1 Ordersforglovesunderthisspecificationshouldinclude
authorizing their use, a margin of safety shall be allowed the following information:
between the maximum voltage on which they are used and the
6.1.1 Type,
proof-test voltage at which they are tested. The relationship 6.1.2 Class,
between proof-test voltage and the maximum voltage at which 6.1.3 Length, Fig. 2
the gloves shall be used is shown in Table 1. 6.1.4 Size,
4.3 Work practices vary from user to user and are dependent 6.1.5 Color,
upon many factors. These may include, but are not limited to, 6.1.6 Cuff design, and
operating system voltages, construction design, work proce- 6.1.7 With or without a halogenation treatment.
dure techniques, weather conditions, and so forth. Therefore, 6.2 The listing of types, classes, lengths, sizes, colors, and
except for the restriction set forth in this specification because cuffdesignsisnotintendedtomeanthatallshallnecessarilybe
of design limitations, the use and maintenance of this equip- available from manufacturers; it signifies only that, if made,
ment is beyond the scope of this specification. they shall conform to the details of this specification.
D 120 – 02a (2006)
A
TABLE 2 AC Voltage Requirement Proof Test Currents
Maximum Proof-Test Current, mA
Minimum
Proof-Test
Class of Glove Breakdown
280-mm 360-mm 410-mm 460-mm
Voltage, rms, V
Voltage, rms, V
(11-in.) Glove (14-in.) Glove (16-in.) Glove (18-in.) Glove
BB
00 2 500 4 000 8 12
0 5 000 6 000 8 12 14 16
1 10 000 20 000 . 14 16 18
2 20 000 30 000 . 16 18 20
3 30 000 40 000 . 18 20 22
4 40 000 50 000 . . 22 24
A
Proof test current shall be measured to an accuracy of 61 mA.
B
Not applicable.
TABLE 3 DC Voltage Requirements
8.3.2 Standard lengths for Class 0 gloves are 280 mm (11
Proof-Test Minimum Breakdown in.), 360 mm (14 in.), 410 mm (16 in.), and 460 mm (18 in.).
Class of Glove
Voltage avg V Voltage avg V 1
The permissible variations shall be 613 mm (6 ⁄2 in.).
00 10 000 13 000
8.3.3 Standard lengths for Class 1, 2, and 3 gloves are 360
0 20 000 35 000
mm (14 in.), 410 mm (16 in.), and 460 mm (18 in.). The
1 40 000 60 000
permissible variation shall be 613 mm (6 ⁄2 in.).
2 50 000 70 000
3 60 000 80 000
8.3.4 Standard lengths for Class 4 gloves are 410 mm (16
4 70 000 90 000
in.) and 460 mm (18 in.). The permissible variation shall be
613 mm (6 ⁄2 in.).
7. Manufacture and Marking
9. Workmanship and Finish
7.1 The gloves shall be produced by a seamless process.
9.1 Gloves shall be free on both inner and outer surface of
7.2 The gloves shall have a smooth finish and the cuff edges
harmfulphysicalirregularitiesthatcanbedetectedbythorough
shall be finished with a roll or a reinforcing strip of rubber,
test and inspection.
unless otherwise specified.
9.1.1 Harmful physical irregularities may be defined as any
7.3 Each glove shall be marked clearly and permanently
feature that disrupts the uniform, smooth surface contour and
with the name of the manufacturer or supplier,ANSI/ASTM D
represents a potential hazard to the user, such as pinholes,
120, type, class, and size.All such marking shall be confined to
cracks, blisters, cuts, conductive embedded foreign matter,
the cuff portion of the glove and shall be nonconducting and
creases, pinch marks, voids (entrapped air), prominent ripples,
applied in such a manner as to not impair the required
and prominent mold marks.
properties of the glove.
9.2 Nonharmful physical irregularities may be defined as
7.3.1 Each glove shall be marked with a label that gives the
surface irregularities present on the inner and outer surfaces of
information specified in 7.3. This label shall be the color
the rubber glove due to imperfections on forms or molds and
specified for each voltage class: Class 00—beige, Class
inherentdifficultiesinthemanufacturingprocess.Theseirregu-
0—red, Class 1—white, Class 2—yellow, Class 3—green, and
larities may appear as mold marks that look like cuts even
Class 4—orange.
though they are actually a raised ridge of rubber, indentations,
7.4 At the request of the user, the gloves may be given a
protuberances, embedded foreign material, or color splashes
halogenation treatment to reduce surface friction. This treat-
that are acceptable provided that:
ment shall have no detrimental effect on the electrical, chemi-
9.2.1 The indentations, protuberance or mold marks tend to
cal, or physical properties of the gloves.
blend into a smooth slope upon stretching of the material.
9.2.2 The rubber thickness at any irregularity conforms to
8. Dimensions and Permissible Variations
the thickness requirements.
8.1 Sample gloves selected in accordance with 13.2 shall
9.2.3 Foreign material remains in place when the glove is
fall within the thickness limits specified in Table 4, when
folded and stretched with the material surrounding it.
determined in accordance with 17.1.
9.2.4 Color splashes are no larger than 1 mm in any
8.2 Sample gloves selected in accordance with 13.2 shall
direction on the inner surface of the work area.
conform to standard sizes when determined in accordance with
9.2.4.1 The working area is defined as all finger and thumb
17.2. Standard sizes are 203 mm (8 in.), 216 mm (8 ⁄2 in.), 229
crotches, the palm (area between the wrist and the base of the
1 1
mm (9 in.), 241 mm (9 ⁄2 in.), 254 mm (10 in.), 267 mm (10 ⁄2
finger and thumb) and the area of the finger and thumb facing
in.), 279 mm (11 in.), 292 mm (11 ⁄2 in.), and 305 mm (12 in.).
the palm not extending beyond the center line of the crotch.
The permissible variation in size shall be 613 mm (6 ⁄2 in.).
See Fig. 1.
8.3 Sample gloves selected in accordance with 13.2 shall
conform to standard lengths when measured in accordance
10. Chemical and Physical Requirements
with 17.3.
8.3.1 Standard lengths for Class 00 gloves are 280 mm (11 10.1 Glove test material taken from sample gloves selected
in.), and 360 mm (14 in.). The permissible variations shall be inaccordancewith13.3shallconformtophysicalrequirements
613 mm (6 ⁄2 in.). in Table 5 and the accelerated aging in 19.2.6.
D 120 – 02a (2006)
FIG. 2 Length and Contour Measurements on Contour Cuff Gloves
TABLE 4 Thickness Measurements
proof-test voltage (average value) specified in Table 2 or Table
Minimum Thickness 3.TheprooftestshallbeperformedinaccordancewithSection
Maximum Thickness
Class of
18. The test voltage shall be applied continuously for 3 min.
In Crotch Other Than Crotch
Glove
11.1.1 When the ac proof test is used, the 60-Hz proof-test
mm in. mm in. mm in.
current shall not exceed the values specified in Table 2 at any
00 0.20 0.008 0.25 0.010 0.75 0.030
time during the test period. (Note 1 and Note 2).
0 0.46 0.018 0.51 0.020 1.02 0.040
1 0.63 0.025 0.76 0.030 1.52 0.060
11.2 Sample gloves selected in accordance with 13.2 shall
2 1.02 0.040 1.27 0.050 2.29 0.090
not break down at voltages below those specified in Table 2 or
3 1.52 0.060 1.90 0.075 2.92 0.115
4 2.03 0.080 2.54 0.100 3.56 0.140 Table 3 when tested in accordance with Section 18.
11.2.1 Gloves that have been subjected to a minimum
breakdownvoltagetestshallnotbeusedforelectricprotection.
TABLE 5 Physical Requirements
Proof test current shall be measured to an accuracy of 61 mA.
Property Type I Type II
11.3 Sample gloves selected in accordance with 13.2 shall
Tensile strength, min, Die C, MPa (psi) 17.2 (2500) 10.3 (1500) be subjected to a 60-Hz ac moisture absorption/proof test in
Tensile stress at 200 %, max, MPa (psi) 2.1 (300) 2.1 (300)
accordance with Section 18.
Ultimate elongation, min, % 600 500
11.3.1 The 60-Hz ac proof test current shall not exceed the
Tension set, max at 400, % 25 25
Tear resistance, min, kN/m (lbf/in.) 21 (120) 14 (80)
values specified in Table 2 by more than 2 mA.
Puncture resistance, min, kN/m (lbf/in.) 18 (100) 18 (100)
Hardness, max, shore A 47 47
NOTE 1—If the ac proof test is made at any frequency other than 60 Hz,
the permissible proof-test current shall be computed from the direct ratio
of the frequencies.
NOTE 2—A proof-test current is an indication of the validity of the
10.2 Intheeventofadispute,theidentificationoftherubber
glove make-up, the dielectric constant of the type of material used, the
polymer in Type I gloves shall be performed in accordance thickness, and the total contact area under test.
with 19.1.
12. Guarantee
10.3 Type II glove test material taken from sample gloves
selected in accordance with 13.3 shall show no visible effec
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