The ASTM C1326 test is a microhardness test that uses a pointed, pyramidal diamond shaped, rhombic-based indent, pressed into a test ceramic specimen. This uses a predefined load, which produces a permanent indentation on specimens. This indentation is used to provide a relative resistance of the specimen to penetration.
Scope:
ASTM C1326 test method explains the measurement of Knoop indentation hardness of advanced ceramics. This test is specifically used for thin sheets or very brittle materials, where a small indentation is made for testing purposes. The applied force or the predetermined load in ASTM C1326 is used to determine Knoop hardness that basically reflects upon the material’s resistance to penetration by the pointed, pyramidal diamond shaped Knoop indenter. Keeping the same load, Knoop indenters are typically 2.8 times longer and shallower than Vickers indentations. This helps in making easier-to-read indentations.
Test Procedure:
In the ASTM C1326 test, the elastic springback of the narrow diagonal is considered to be negligible, and the ratio of the applied load with the projected indentation area on the surface of the ceramic specimen gives Knoop hardness. By measuring Knoop hardness for a broad range of predetermined loads, full characterization can be obtained. Knoop hardness of ceramics is inversely proportional to the indentation size or the indentation force. The nature of the curve obtained is termed as indentation size effect. The test method involved in ASTM C1326 makes indentation without cracking. The amount of applied load should be such that the hardness reading stays in the plateau region of the indentation size effect curve without exceeding the limit of cracking.
Sample size:
Ceramic specimen in ASTM C1326 is of standard size.
Data:
At the time of development of the test procedures in ASTM C1326, the amount of force applied was expressed in units of grams-force (gf) and kilograms-force (kgf). However, even though the standard system specifies Newton (N) is the International system of Units of force, continued usage of gf and kgf are occasionally observed.
ASTM E572 test method covers the analysis of stainless and alloy steels by Wavelength Dispersive X-ray Fluorescence Spectrometry (WDXRF). It provides rapid, multi-element determinations with sufficient accuracy to assure product quality.
The ASTM D2674 is a standard test method for the analysis of sulfochromate etches solution used in the surface preparation of aluminum. The ASTM D2674 standard specifies a method for determining the efficacy of an etchant used to prepare the surface of aluminum alloys for subsequent adhesive bonding.
An immunological method for quantization of Hevea Natural Rubber (HNRL) proteins using rabbit anti-HNRL serum. Rabbits immunized with HNRL proteins react to the majority of the proteins present, and their sera have the capability to detect most if not all the proteins in HNRL.
ASTM G65 measures the resistance of metallic materials to abrasion using the dry sand/rubber wheel apparatus. The quality, durability, and toughness of the sample are determined using this test. Metallic materials are ranked in their resistance to scratching abrasion under a controlled environment.
ASTM E2141 test methods provide accelerated aging and monitoring of the performance of time-dependent electrochromic devices (ECD) integrated in insulating glass units (IGU). This test helps to understand the relative serviceability of electrochromic glazings applied on ECD.
ASTM C724 test method is used in analyzing the quality and ease of maintenance of a ceramic decoration on architectural-type glass. This test method is useful in the acknowledgment of technical standards.
Send us a request
Process for testing
STEP 01
You share material and testing requirements with us
STEP 02
We ensure your sample pick-up in an ensured manner
STEP 03
We deliver test report to your inbox
Just share your testing requirements and leave the rest on us!