Astm D 3533 – 90 (Reapproved 2001) pdf free download

Standard Test Method for
Rubber—Nitrogen Content1

This standard is issued under the fixed designation D 3533; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the 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

1.1 This method outlines two procedures for the determination of total nitrogen in natural and synthetic rubbers and
latexes, using variants of the Kjeldahl process.

1.2 It is applicable to raw rubbers, cured or uncured
compounds, and finished articles.

1.3 Procedure A, the referee method, is a macro procedure.
Procedure B, the alternative method, is a semi-micro procedure
using the same reagent as in Procedure A.

1.4 In the absence of other nitrogen-containing materials,
the method can be used for the estimation of the NBR content
of NBR rubbers and rubber products.

1.5 The values stated in SI units are to be regarded as the
standard.

1.6 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. Specific warnings
are given in 8.2 and 9.2.

2. Referenced Documents

2.1 ASTM Standards:
D 1076 Specification for Rubber—Concentrated, Ammonia
Preserved, Creamed, and Centrifuged Natural Latex2
D 3040 Practice for Preparing Precision Statements for
Standards Related to Rubber and Rubber Testing3
D 4483 Practice for Determining Precision for Test Method
Standards in the Rubber and Carbon Black Industries2
E 147 Specification for Apparatus for Microdetermination
of Nitrogen by Kjeldahl Method4
NOTE 1—The specific dated edition of Practice D 3040 that prevails in
this method is referenced in the Precision section.