ASTM F735-94(2001)
(Test Method)Standard Test Method for Abrasion Resistance of Transparent Plastics and Coatings Using the Oscillating Sand Method
Standard Test Method for Abrasion Resistance of Transparent Plastics and Coatings Using the Oscillating Sand Method
SCOPE
1.1 This test method determines the resistance of transparent plastics and transparent coatings utilized in windows or viewing ports, to surface abrasion using oscillating sand.
1.2 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.
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Designation:F735–94 (Reapproved 2001)
Standard Test Method for
Abrasion Resistance of Transparent Plastics and Coatings
Using the Oscillating Sand Method
This standard is issued under the fixed designation F 735; 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 because of its inertia; therefore the relative motion between
sand and specimen at the interface is large.
1.1 This test method determines the resistance of transpar-
3.3 The thickness or height of the sand, which rests on top
ent plastics and transparent coatings utilized in windows or
of the test specimen, remains relatively constant over the test
viewing ports, to surface abrasion using oscillating sand.
specimen itself during the motion of the cradle. Therefore, the
1.2 This standard does not purport to address all of the
average pressure of the sand also remains constant, giving
safety concerns, if any, associated with its use. It is the
highly reproducible results over the entire surface of the test
responsibility of the user of this standard to establish appro-
specimen.
priate safety and health practices and determine the applica-
3.4 The degree of abrasion is measured by the amount of
bility of regulatory limitations prior to use.
changeinluminoustransmissionandhazeafterexposuretothe
2. Referenced Documents
test.
2.1 ASTM Standards:
4. Significance and Use
C 136 Test Method for Sieve Analysis of Fine and Coarse
4.1 Many types of plastics are used in the making of
Aggregates
transparencies and enclosures or covers. It is the intent of this
D 618 Practice for Conditioning Plastics for Testing
test to provide a means of determining the relative abrasion
D 1003 Test Method for Haze and Luminous Transmittance
resistance of plastics or coatings, or both, to such operational
of Transparent Plastics
uses as the cleaning of dirt, removal of bug residue, or any
E 11 Specification for Wire-Cloth Sieves for Testing Pur-
other rubbing action that can cause abrasion.
poses
E 691 Practice for Conducting an Interlaboratory Study to
5. Apparatus
Determine the Precision of a Test Method
5.1 Abrader—The abrader illustrated in Fig. 1 consists of a
3. Summary of Test Method specimenholder,sandcradle,drivemechanism,variablepower
supply and counter.
3.1 The test method consists of measuring and recording the
5.1.1 The specimen holder shall have a cutout approxi-
haze and light transmission of a test specimen, mounting the
mately 100 by 100 mm (4 by 4 in.) to receive the specimen.
specimen so that it forms part of the bottom of a tray (sand
The specimen shall be mounted flush to within 1 mm (0.04 in.)
cradle), covering the specimen with abrading media, and
high with the specimen holder.
subjecting the cradle to a specific number of to-and-fro
5.1.2 The specimen holder forms the bottom of the sand
motions. After exposure to the abrasion, the haze and light
cradle.
transmission are remeasured to determine any change in these
values.
3.2 At the stroke velocity specified in this practice, the
TABLE 1 Properties
entire mass of sand shifts significantly within the sand cradle
E11 Sieve Designation
Mean % on Standard De- Cululative %
Sieve viation, % Retained, Mean
U.S. No mm
This test method is under the jurisdiction of ASTM Committee F7 on
8 2.36 30.0 7.4 30.0
Aerospace and Aircraft and is the direct responsibility of Subcommittee F07.08 in
10 2.00 40.0 8.4 70.0
Transparent Enclosures and Materials.
12 1.70 22.0 7.8 92.0
Current edition approved May 15, 1994. Published July 1994. Originally
14 1.40 6.0 1.1 98.0
e1
published as F 835 – 81. Last previous edition F 735 – 81(1987) .
Pan . 2.0 0.7 100.0
Annual Book of ASTM Standards, Vol 04.02.
A
Annual Book of ASTM Standards, Vol 08.01. Effective size at 90 % retained = 1.70 6 0.10 mm. Uniformity Coeffi-
Annual Book of ASTM Standards, Vol 14.02. cient = 1.29 6 0.05 mm Shape Factor = 0.406 0.07 mm.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F735
FIG. 1 Oscillating Sand Abrader
5.1.3 The cradle size, as defined in Fig. 1 will provide a 6.1.1 Properties—See Table 1.
13-mm (0.50-in.) head of sand, utilizing 1000 g (2.2 lb).
6.1.2 Test Methods:
5.1.4 A drive mechanism shall provide 300 strokes per
NOTE 1—These tests need be applied only when qualifying a new
minute of reciprocating motion of approximately 100-mm
supply of sand.
(4-in.) travel. Motion in one direction is defined as one stroke.
5.1.5 Avariablepowersupplyshallbeutilizedtocontrolthe
6.1.2.1 Perform sieve analysis in accordance with Method
abrader motor to operate at 300 strokes per minute.
C 136.
5.1.6 A counter shall record the number of strokes during a
6.1.2.2 Plot the cumulative percent retained
...
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