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ASTM D1155-03

(Test Method)

Standard Test Method for Roundness of Glass Spheres

Standard Test Method for Roundness of Glass Spheres

SIGNIFICANCE AND USE
The roundness of glass spheres is one measureable aspect relating to their performance as a retroreflective media. The function of this test method is to measure the percent of true spheres as related to compliance with applicable specifications.
Note 1—This method has been used in other industrial areas outside the intended scope of this test method.
FIG. 1 Apparatus for Roundness Test of Glass Spheres
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 SI 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
09-May-2003
ICS
81.040.30 - Glass products
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.44 - Traffic Coatings
Current Stage
Ref Project

Relations

Replaces
ASTM D1155-89(1994)e1 - Standard Test Method for Roundness of Glass Spheres (Withdrawn 2003)
Effective Date
10-May-2003
Replaced By
ASTM D1155-10 - Standard Test Method for Roundness of Glass Spheres
Effective Date
01-Jul-2010

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ASTM D1155-03 - Standard Test Method for Roundness of Glass Spheres
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D1155–03
Standard Test Method for
1
Roundness of Glass Spheres
This standard is issued under the fixed designation D1155; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Summary of Test Method
2
1.1 This test method covers the determination of the 3.1 The glass particles are mechanically separated into true
percent of true spheres in glass spheres used for retroreflective spheres and irregular particles by controlled vibration on a
marking purposes and industrial uses. glass plate fixed at a predetermined slope.
1.2 This test method includes two procedures as follows:
4. Significance and Use
1.2.1 Procedure A, in which the selected specimen is split
4.1 The roundness of glass spheres is one measureable
into two size ranges or groups prior to separation into true
spheres and irregular particles, and aspect relating to their performance as a retroreflective media.
The function of this test method is to measure the percent of
1.2.2 Procedure B, in which the selected specimen is split
into five size ranges or groups prior to separation. true spheres as related to compliance with applicable specifi-
cations.
1.2.3 In determining compliance with specification require-
ments, either ProcedureAor Procedure B may be used. Where
NOTE 1—This method has been used in other industrial areas outside
tests indicate failure to meet the specified percent of true
the intended scope of this test method.
spheres and irregular particles, the referee test shall be made in
5. Apparatus (Fig. 1)
accordance with Procedure B.
1.3 The values stated in SI units are to be regarded as the
5.1 Electrical Feeder-Vibrator, upon which is mounted a
standard. The values given in parentheses are for information
smoothglasspanel,152.4mm(6in.)wideand381mm(15in.)
only.
long.
1.4 This standard does not purport to address all of the
5.2 Hinged Base, supporting the vibrator and panel in such
safety concerns, if any, associated with its use. It is the
a manner that the angle of slope of the glass panel with the
responsibility of the user of this standard to establish appro-
horizontal may be varied and fixed in any predetermined
priate safety and health practices and determine the applica-
position.
bility of regulatory limitations prior to use.
5.3 Vibrator—Means of varying the amplitude or strength
of the vibrations transmitted to the glass panel, at a fixed
2. Referenced Documents
frequency of 60 impulses per second.
3
2.1 ASTM Standards:
5.4 FeedingDeviceorPan,affixedtotheglasspanelinsuch
E11 SpecificationforWovenWireTestSieveClothandTest
a manner that the selected sample of glass may be evenly
Sieves
dropped at a uniform rate upon the glass panel, from various
heights above the panel and at various points on the slope.
5.5 Collecting Pans or Containers, at either end of the
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
sloping panel, in which to collect the spheres and irregular
and Related Coatings, Materials, andApplications and is the direct responsibility of
particles.
Subcommittee D01.44 on Traffic Coatings.
Current edition approved May 10, 2003. Published June 2003. Originally
approved in 1951. Withdrawn December 2002 and reinstated as D1155 – 03. DOI: 6. Selection of Specimen
10.1520/D1155-03.
2 6.1 Select a 50-g specimen of the glass spheres to be tested
Forinformationonthedevelopmentofthistestmethod,referencemaybemade
for roundness in one of the following ways:
to the paper by Keeley, A. E., “Roundness Testing of Glass Spheres,” ASTM
Bulletin, No. 174, May, 1951, p. 72.
6.1.1 By mechanically splitting a bag or other container of
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
glass spheres, selected at random from the shipment to be
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
tested, or
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 6.1.2 By grain or seed-rod selection from the container.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D1155–03
FIG. 1 Apparatus for Roundness Test of Glass Spheres
7. Procedure A one-thirdpointoftheslope,sothatthespheresmaybedropped
in a uniform monolayer onto the glass panel from a height of
7.1 Sieve the selected specimen through a 300-µm (No. 50)
1
approximately 13 mm ( ⁄2 in.).
sieve (Note 2). Run the spheres retained on the sieve as one
group, and run the spheres passing the sieve as a second group. 7.3 Place the size
...

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Standard Test Method for Roundness of Glass Spheres

SIGNIFICANCE AND USE
4.1 The roundness of glass spheres is one measurable aspect relating to their performance as a retroreflective media. The function of this test method is to measure the percent of true spheres as related to compliance with applicable specifications.
Note 1: This method has been used in other industrial areas outside the intended scope of this test method.
SCOPE
1.1 This test method2 covers the determination of the percent of true spheres in glass spheres used for retroreflective marking purposes and industrial uses.  
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1.1 This guide identifies and describes seven test methods for measuring the index of refraction of glass, with comments relevant to their uses such that an appropriate choice of method can be made. Four additional methods are mentioned by name, and brief descriptive information is given in Annex A1. The choice of a test method will depend upon the accuracy required, the nature of the test specimen that can be provided, the instrumentation available, and (perhaps) the time required for, or the cost of, the analysis. Refractive index is a function of the wavelength of light; therefore, its measurement is made with narrow-bandwidth light. Dispersion is the physical phenomenon of the variation of refractive index with wavelength. The nature of the test-specimen refers to its size, form, and quality of finish, as described in each of the methods herein. The test methods described are mostly for the visible range of wavelengths (approximately 400 μm to 780 μm); however, some methods can be extended to the ultraviolet and near infrared, using radiation detectors other than the human eye.  
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SCOPE
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SCOPE
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