ASTM D1155-10
(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 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 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.
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Designation: D1155 − 10
StandardTest 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 E691 Practice for Conducting an Interlaboratory Study to
2
Determine the Precision of a Test Method
1.1 This test method covers the determination of the
percent of true spheres in glass spheres used for retroreflective 2.2 Other Document:
marking purposes and industrial uses.
ASTM MNL32 Manual on Test Sieving Methods
1.2 This test method includes two procedures as follows:
3. Summary of Test Method
1.2.1 Procedure A, in which the selected specimen is split
into two size ranges or groups prior to separation into true
3.1 The glass particles are mechanically separated into true
spheres and irregular particles, and
spheres and irregular particles by controlled vibration on a
1.2.2 Procedure B, in which the selected specimen is split
glass plate fixed at a predetermined slope.
into five size ranges or groups prior to separation.
1.2.3 In determining compliance with specification
4. Significance and Use
requirements, either ProcedureAor Procedure B may be used.
4.1 The roundness of glass spheres is one measurable aspect
Where tests indicate failure to meet the specified percent of
relating to their performance as a retroreflective media. The
true spheres and irregular particles, the referee test shall be
function of this test method is to measure the percent of true
made in accordance with Procedure B.
spheres as related to compliance with applicable specifications.
1.3 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
NOTE 1—This method has been used in other industrial areas outside
only. the intended scope of this test method.
1.4 This standard does not purport to address all of the
5. Apparatus (Fig. 1)
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5.1 Electrical Feeder-Vibrator, upon which is mounted a
priate safety and health practices and determine the applica-
smoothglasspanel,152.4mm(6in.)wideand381mm(15in.)
bility of regulatory limitations prior to use.
long.
5.2 Hinged Base, supporting the vibrator and panel in such
2. Referenced Documents
a manner that the angle of slope of the glass panel with the
3
2.1 ASTM Standards:
horizontal may be varied and fixed in any predetermined
E11 Specification for Woven Wire Test Sieve Cloth and Test
position.
Sieves
E177 Practice for Use of the Terms Precision and Bias in 5.3 Vibrator—Meansofvaryingtheamplitudeorstrengthof
ASTM Test Methods the vibrations transmitted to the glass panel, at a fixed
frequency of 60 impulses per second.
5.4 Feeding Device or Pan (Optional), affixed to the glass
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
panel in such a manner that the selected sample of glass may
and Related Coatings, Materials, andApplications and is the direct responsibility of
be evenly dropped at a uniform rate upon the glass panel, from
Subcommittee D01.44 on Traffic Coatings.
Current edition approved July 1, 2010. Published September 2010. Originally various heights above the panel and at various points on the
approved in 1951. Last previous edition approved in 2003 as D1155 – 03. DOI:
slope.
10.1520/D1155-10.
2
Forinformationonthedevelopmentofthistestmethod,referencemaybemade
5.5 Collecting Pans or Containers, at either end of the
to the paper by Keeley, A. E., “Roundness Testing of Glass Spheres,” ASTM
sloping panel, in which to collect the spheres and irregular
Bulletin, No. 174, May 1951, p. 72.
3 particles.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.6 Digital Level, approximately 30 to 60 cm (12 to 24 in.)
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. in length (not shown).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D1155 − 10
FIG. 1 Apparatus for Roundness Test of Glass Spheres
6. Selection of Specimen
6.1 Select a specimen of approximately 10 to 50 g of the
glass spheres to be tested for roundness in one of the following
ways:
6.1.1 By mechanically splitting a bag or other container of
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 document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D1155–03 Designation:D1155–10
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
2
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 ProcedureAor 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.
2. Referenced Documents
3
2.1 ASTM Standards:
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves Specification for Woven Wire Test Sieve Cloth and Test
Sieves
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
2.2 Other Document:
ASTM MNL32 Manual on Test Sieving Methods
3. Summary of Test Method
3.1 The glass particles are mechanically separated into true spheres and irregular particles by controlled vibration on a glass
plate fixed at a predetermined slope.
4. Significance and Use
4.1 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.
5. Apparatus (Fig. 1)
5.1 Electrical Feeder-Vibrator , upon which is mounted a smooth glass panel, 152.4 mm (6 in.) wide and 381 mm (15 in.) long.
5.2 HingedBase,supportingthevibratorandpanelinsuchamannerthattheangleofslopeoftheglasspanelwiththehorizontal
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
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:
10.1520/D1155-03.
Current edition approved July 1, 2010. Published September 2010. Originally approved in 1951. Last previous edition approved in 2003 as D1155 – 03. DOI:
10.1520/D1155-10.
2
For information on the development of this test method, reference may be made to the paper by Keeley ,A. E., “Roundness Testing of Glass Spheres,” ASTM Bulletin,
No. 174, May,May 1951, p. 72.
3
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D1155–10
FIG. 1 Apparatus for Roundness Test of Glass Spheres
may be varied and fixed in any predetermined position.
5.3 Vibrator—Means of varying the amplitude or strength of the vibrations transmitted to the glass panel, at a fixed frequency
of 60 impulses per second.
5.4 Feeding Device or Pan (Optional), affixed to the glass panel in such a manner that the selected sample of glass may be
evenly 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
...
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