ASTM D1155-89(1994)e1

Standard Test Method for Roundness of Glass Spheres (Withdrawn 2003)

SCOPE
1.1 This test method  covers the determination of the percent of true spheres in glass spheres used for retroreflective marking purposes and industrial uses.  
1.2 This test method includes two procedures as follows:
1.2.1 Procedure A , in which the selected specimen is split into two size ranges or groups prior to separation into true spheres and irregular particles, and  
1.2.2 Procedure B , in which the selected specimen is split into five size ranges or groups prior to separation.  
1.2.3 In determining compliance with specification requirements, either Procedure A or Procedure B may be used. Where tests indicate failure to meet the specified percent of true spheres and irregular particles, the referee test shall be made in accordance with Procedure B.  
1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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: 31-Dec-1993
• Withdrawal Date: 19-Feb-2003
• ICS: 81.040.30 - Glass products
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.44 - Traffic Coatings

Relations

• Replaced By: ASTM D1155-03 - Standard Test Method for Roundness of Glass Spheres
• Effective Date: 10-May-2003

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
e1
Designation: D 1155 – 89 (Reapproved 1994)
Standard Test Method for
Roundness of Glass Spheres
This standard is issued under the fixed designation D 1155; 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—Unit of measurement statement was added editorially in October 1994.
1. Scope 4. Significance and Use
1.1 This test method covers the determination of the 4.1 The roundness of glass spheres is one measureable
percent of true spheres in glass spheres used for retroreflective aspect relating to their performance as a retroreflective media.
marking purposes and industrial uses. The function of this test method is to measure the percent of
1.2 This test method includes two procedures as follows: true spheres as related to compliance with applicable specifi-
1.2.1 Procedure A, in which the selected specimen is split cations.
into two size ranges or groups prior to separation into true
NOTE 1—This method has been used in other industrial areas outside
spheres and irregular particles, and
the intended scope of this test method.
1.2.2 Procedure B, in which the selected specimen is split
5. Apparatus (Fig. 1)
into five size ranges or groups prior to separation.
1.2.3 In determining compliance with specification require-
5.1 Electrical Feeder-Vibrator, upon which is mounted a
ments, either Procedure A or Procedure B may be used. Where
smooth glass panel, 6 in. (152.4 mm) wide and 15 in. (381 mm)
tests indicate failure to meet the specified percent of true
long.
spheres and irregular particles, the referee test shall be made in
5.2 Hinged Base, supporting the vibrator and panel in such
accordance with Procedure B.
a manner that the angle of slope of the glass panel with the
1.3 The values stated in inch-pound units are to be regarded
horizontal may be varied and fixed in any predetermined
as the standard. The values given in parentheses are for
position.
information only.
5.3 Vibrator—Means of varying the amplitude or strength
1.4 This standard does not purport to address all of the
of the vibrations transmitted to the glass panel, at a fixed
safety concerns, if any, associated with its use. It is the
frequency of 60 impulses per second.
responsibility of the user of this standard to establish appro-
5.4 Feeding Device or Pan, affixed to the glass panel in such
priate safety and health practices and determine the applica-
a manner that the selected sample of glass may be evenly
bility of regulatory limitations prior to use.
dropped at a uniform rate upon the glass panel, from various
heights above the panel and at various points on the slope.
2. Referenced Documents
5.5 Collecting Pans or Containers, at either end of the
2.1 ASTM Standards:
sloping panel, in which to collect the spheres and irregular
E 11 Specification for Wire-Cloth Sieves for Testing Pur-
particles.
poses
6. Selection of Specimen
3. Summary of Test Method
6.1 Select a 50-g specimen of the glass spheres to be tested
3.1 The glass particles are mechanically separated into true
for roundness in one of the following ways:
spheres and irregular particles by controlled vibration on a
6.1.1 By mechanically splitting a bag or other container of
glass plate fixed at a predetermined slope.
glass spheres, selected at random from the shipment to be
tested, or
6.1.2 By grain or seed-rod selection from the container.
This test method is under the jurisdiction of ASTM Committee D-1 on Paint
and Related Coatings, Materials, and Applications and is the direct responsibility of
7. Procedure A
Subcommittee D01.44 on Traffic Coatings.
Current edition approved May 26, 1989. Published July 1989. Originally
7.1 Sieve the selected specimen through a 300-μm (No. 50)
e1
published as D 1155 – 51 T. Last previous edition D 1155 – 53(1983) .
sieve (Note 2). Run the spheres retained on the sieve as one
For information on the development of this test method, reference may be made
group, and run the spheres passing the sieve as a second group.
to the paper by Keeley, A. E., “Roundness Testing of Glass Spheres,” ASTM
Bulletin, No. 174, May, 1951, p. 72.
Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
e1
D 1155 – 89 (1994)
FIG. 1 Apparatus for Roundness Test of Glass Spheres
NOTE 2—Detailed requirements for ASTM sieves are given in Speci-
position that irregular particles on the upper half of the panel
fication E 11.
will move slowly up the slope, while the true spheres roll
down. Feed slowly, at such a rate that no “bunching up” or
7.2 Level the glass panel; then raise one end from the
flooding of spheres on the panel occurs.
horizontal by the distance in inches indicated on the calibration
curve in Fig. 2 for the average diameter of spheres in the group. 7.4 When the glass panel is well covered with spheres, stop
Affix the feed hopper to the side of the panel at the upper feeding until separation of true spheres has occurred. Stop the
one-third point of the slope, so that the spheres may be dropped vibrator and, after all true spheres have rolled down the slope
in a uniform monolayer onto the glass panel from a height of
into the sphere pan, brush or scrape all particles remaining on
approximately ⁄2 in. (13 mm). the panel into the upper pan containing the irregular particles.
7.3 Place the size group to be tested in the feed pan, and
For purpose of test, all particles not rolling freely down the
sta
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