ASTM-D2134 › Standard Test Method for Determining the Hardness of Organic Coatings with a Sward-Type Hardness Rocker
The following bibliographic material is provided to assist you with your purchasing decision:
Scope
1.1 This test method covers the determination of the relative degree of surface hardness of organic coatings using a specific apparatus widely used in the coatings industry.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This test method does not purport to address all of the safety problems, 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.
Significance and Use
Sward-type hardness rocker instruments have been used by the coatings industry for more than a half a century as a nondestructive test instrument to measure cure and ultimate surface hardness of organic coatings (see Refs. (1) through (11)).3 An accepted standard test method for the use of such an instrument is long overdue.
In previous task group work designed to establish an ASTM method for measuring hardness of organic coatings with Sward-type hardness rocker instruments, round-robin test results continually showed poor interlaboratory reproducibility. This lack of interlaboratory agreement could have resulted from dimensional variations among instruments, with the contact rocker rings as the most likely offender in that regard. There are several producers of Sward-type hardness rockers making instruments that differ among themselves in net weight and ring radius. Some of them exceed the measurements and net weight called for in this test method.
This test method, however, is useful within laboratories to quickly screen and measure the surface hardness of candidate coatings.
Keywords
hardness; hardness tests-Sward hardness; surface hardness; ICS Number Code 25.220.60 (Organic coatings)
To find similar documents by ASTM Volume:
06.01 (Paint -- Tests for Chemical, Physical, and Optical Properties; Appearance)
To find similar documents by classification:
This document comes with our free Notification Service, good for the life of the document.
This document is available in either Paper or PDF format.
Customers who bought this document also bought:
GEIA-STD-0006Requirements for Using Robotic Hot Solder Dip to Replace the Finish on Electronic Piece Parts
AS-9120
Quality Management Systems - Requirements for Aviation, Space, and Defense Distributors
EOS/ESD-STM-2.1
ESD Association Standard Test Method for the Protection of Electrostatic Discharge Susceptible Items - Garments - Resistive Characterization
Document Number
ASTM-D2134-19R24
Revision Level
2019 R24 EDITION
Status
Current
Modification Type
Reapproval
Publication Date
Jan. 25, 2024
Document Type
Test Method
Page Count
4 pages
Committee Number
D01.23