ASTM D5318-97

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Designation: D 5318 – 97
Standard Test Method for
Hydrolyzable Chloride in Peroxy Esters and Peroxy
Dicarbonates
This standard is issued under the fixed designation D 5318; 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 * 4. Summary of Test Method
1.1 This test method covers determination of the hydrolyz- 4.1 The hydrolyzable chloride content of the peroxy ester or
able chloride content of peroxy esters and peroxy dicarbonates. peroxy dicarbonate is determined volumetrically using silver
nitrate titrant after the alkaline hydrolysis of the material. The
NOTE 1—There are no ISO standards covering the primary subject of
end point of the titration is detected potentiometrically.
this test method.
1.2 The values stated in SI units are to be regarded as the
5. Significance and Use
standard.
5.1 Peroxy esters and peroxy dicarbonates are used widely
1.3 The text of this standard references notes and footnotes
as initiators and chemical intermediates in the production and
which provide explanatory material. These notes and footnotes
modification of polymers, including PVC, polyethylene, and
(excluding those in tables and figures) shall not be considered
polypropylene. The level of hydrolyzable chloride in the
as requirements of this standard.
peroxide species may affect its performance in some applica-
1.4 This standard does not purport to address all of the
tions. This test method provides a procedure for determining
safety concerns, if any, associated with its use. It is the
the hydrolyzable chloride content of peroxy esters and peroxy
responsibility of the user of this standard to establish appro-
dicarbonates.
priate safety and health practices and determine the applica-
5.2 As measured by this test method, hydrolyzable chloride
bility of regulatory limitations prior to use. Specific hazards
is defined as the sum of the inorganic chloride content plus the
statements are given in Section 8.
chloride content generated upon alkaline hydrolysis of the
peroxy ester or peroxy dicarbonate.
2. Referenced Documents
2.1 ASTM Standards:
6. Apparatus
D 883 Terminology Relating to Plastics
6.1 Automatic Potentiometric Titrimeter, consisting of a
D 1193 Specification for Reagent Water
potentiometer with a 62-mV sensitivity, a buret graduated in
D 1600 Terminology for Abbreviated Terms Relating to
0.001-mL divisions, and a mechanical stirrer.
Plastics
6.1.1 A system consisting of a Metrohm AG Model 682
E 200 Practice for Preparation, Standardization, and Stor-
Titroprocessor with a Model 664 Control Unit and a Model 665
age of Standard and Reagent Solutions for Chemical
Dosimat has been used successfully.
Analysis
6.2 Combined Silver Electrode—Brinkman Instruments
Catalog No. 020-92-460-8 (Metrohm AG 6.0404.100) or
3. Terminology
equivalent.
3.1 General—Unless otherwise indicated, definitions are in
accordance with Terminology D 883 and abbreviations are in
7. Reagents
accordance with Terminology D 1600.
7.1 Purity of Reagents—Reagent-grade chemicals shall be
used in all tests. It is intended that all reagents shall conform to
the specifications of the Committee on Analytical Reagents of
This test method is under the jurisdiction of ASTM Committee D-20 on Plastics
the American Chemical Society, where such specifications are
and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Materi-
als.
Current edition approved July 10, 1997. Published April 1998. Originally
published as D 5318 – 92. Last previous edition D 5318 – 92.
Annual Book of ASTM Standards, Vols 08.01 and 08.04.
3 5
Annual Book of ASTM Standards, Vol 11.01. Available from Brinkman Instruments, Inc., One Cantiague Road, Westbury,
Annual Book of ASTM Standards, Vol 15.05. NY 11590-0207.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 5318
available. Other grades may be used, provided it is first 9.3 Add 50 mL of isopropyl alcohol.
ascertained that the rea
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