The Knoop hardness tester series "Qness" takes Knoop hardness testing to a whole new level. Our high-end models of the latest generation combine short cycle times with maximum precision. Features like the 8-position tool changer, comprehensive software as well as connectivity via Qconnect make this Knoop hardness tester series the optimum choice for customers seeking the most innovative products on the market.
Micro Knoop Hardness Tester Test force range: 0.25 g - 62.5 kg
- Semiautomatic
- Test force range 20 gf – 10 kgf Option: 0.25 gf – 62.5 kgf
- Vickers, Knoop, Brinell,
Option: Rockwell - Manual XY movable cross table
- Fully automated
- Test force range 20 gf – 10 kgf
Option: 0.25 gf – 62.5 kgf - Vickers, Knoop, Brinell,
Option: Rockwell - Very precise XY slide ± 2µm
- Sample image camera
- High-End fully automated
- Test force range 0.25 gf – 62.5 kgf
- Vickers, Knoop, Brinell, Rockwell
- High precision XY slide ± 0.2µm
- Sample image camera
Macro Knoop Hardness Tester Test force range: 0.3 kg - 3000 kg
- Test methods: Brinell, Knoop, Rockwell, Vickers
- Test force range: 0.3 kg - 3000 kg
- Proven concept – redefined
- Ideal for small samples
- Test methods: Brinell, Knoop, Rockwell, Vickers
- Control: C-frame with manual spindel
- Test methods: Brinell, Knoop, Rockwell, Vickers
- Test force range: 0.3 kg - 3000 kg
- Comfortable test head height-adjustment via motor
- All work piece sizes and large clamping forces
Fully Automatic Knoop Hardness Tester Test force range: 0.3 kg - 3000 kg
- Test methods: Brinell, Knoop, Rockwell, Vickers
- Control: Fully automatic
- Test methods: Brinell, Knoop, Rockwell, Vickers
- Control: XYZ table controlled
- With CE cabinet
Background information Knoop Hardness Testing (DIN EN ISO 4545)
The Knoop hardness is then calculated as the quotient of the test force and the projection area of the in-dentation.
The Knoop method is only used in the small force (up to 10 N) and micro hardness range.
1. Indentation of the diamond pyramid with test force F into the test specimen
2. Measurement of the long diagonal d1 of the indentation
Knoop Hardness Test Results
According to DIN EN ISO 6508-1 the result of a Knoop hardness test is indicated as follows:
700 HK 0.2 / 20 ⇒ Hardness value as per Knoop
700 HK 0.2 / 20 ⇒ Abbreviation for Knoop hardness
Knoop Hardness Tester - FAQ
What is a Knoop hardness tester used for?
A Knoop hardness tester is used to measure the hardness of brittle materials or thin sections, such as ceramics, glass, and coatings. It is particularly useful for materials that might crack or deform under heavier loads used in other hardness tests.
How does the Knoop hardness test work?
The Knoop test involves pressing a rhombic-shaped diamond indenter into the material's surface under a specific load. The length of the long diagonal of the indentation is measured, and the Knoop hardness number (KHN) is calculated based on the applied load and the indentation size.
What are the advantages of using a Knoop hardness tester?
The Knoop test is advantageous for its ability to test very small or thin samples and its suitability for brittle materials. It requires minimal sample preparation and provides precise hardness values with minimal risk of cracking the specimen.
How does Knoop hardness testing differ from Vickers hardness testing?
Both Knoop and Vickers tests use diamond indenters, but the Knoop indenter is elongated, producing an indentation with a longer diagonal, which is measured. Knoop is preferred for anisotropic materials and thin films, while Vickers is better for isotropic materials and thicker samples.
What factors can affect the accuracy of a Knoop hardness test?
Accuracy can be influenced by the surface preparation of the specimen, the precision of the indentation measurement, and the alignment of the indenter. Proper calibration and maintenance of the testing equipment are also crucial for obtaining accurate results.