Static Compressive Strength
1、Strength of diamond is an important parameter to identify the quality of diamond grits and their synthesis/selecting technology. Generally, diamond grits with higher strength and toughness have better duration， and vice versa.

2、Static Compressive Strength of a single grit is its break load under static press. We test the maximum burden vertical pressure of diamond grits which are regarded similarly as equivalent mini-cubic grits, such pressure is the Static compressive Strength, expressed in unit of“N” or “KG”.

Toughness Index
1. Besides high strength and superior abrasiveness, diamond grits have an outstanding feature of high toughness index. Impact toughness inspection shows a similar condition of diamonds’ wearing away during actual performance, thus provides a more valuable toughness index for reference in actual utilizations.

2、Testing method: To mix diamond grits with steel balls in a steel container, measure the percentage of unbroken grits after a number of vibrations, the Toughness Index is therefore determined. Testing more samples quickly, this inspection gives results easily to be statistical surveyed with less relative errors and better representation.

Thermal Toughness Index
1、 During diamond tools producing and using, diamond grits are under high sintering or grinding heat. Good thermal stability is important to assure good tools performance.

2、Thermal Toughness Index is tested by impact instrument similarly as Toughness Index test, but under high temperature.

Impurity
1、 Diamond crystal absorbs graphite and metal catalyst while being synthesized rapidly under HTHP, therefore various kinds of crystal defects formed. Strength of diamond goes down significantly along with the increasing of impurities. It’s an important sector diamond research to control and measure the impurities.

2、 External impurities are non-diamond grits in the materials to be measured. They are measured by observing through microscope.
a) Internal impurities are graphite, metal and metal carbide absorbed by the diamond crystal while being synthesized. They are measured by high sensitive instrument (e.g. spectrum instrument, spectrometer, gas colorimeter, radiation measurements, etc.)

Magnetic Susceptibility
1、Researches indicate that the magnetic susceptibility of synthetic diamond are decided by the content and distribution state of the inside impurities. The relation between the magnetism of diamond and other performance are as follows:
1） There’s a linear relation between the magnetism and impurities. The more impurities the diamond has the more magnetic it will be, and vice versa.
2） The magnetism relates with strength and crystalline shape. Diamond grits with less magnetism have better strength and crystalline shape. Anyway they are not in strict linear relation.
3） the magnetism relates also with thermal stability .

2、Test method: Diamond grit sample does not show its magnetism without outer magnetic effects. While under outer magnetic effects, the sample shows opposite magnetic charges on it’s two ends. Sample can not move under equal magnetic field, but it’s magnetic charges can be measured while sample under unequal magnetic field. Thus the magnetic susceptibility is determined.

Bulk Density
1、Bulk Density is the natural bulk weight of a unit volume of diamond grits in air, expressed in unit of g/cm3. As a common index indicating the filling factor of ultra-hard materials, it reflects the density, grit shape, grit surface shape and size constitution of grits. It is generally adopted for inspecting products’ physical performance, and plays an important role in quality control and grading of ultra-hard products, as well as in grinding tools manufacturing.

2、Bulk Density can be measured by corresponding instrument . Through measuring the volume and quality of a certain volume of diamond grits or micro powder we can obtain corresponding value.

3、 The following factors influence the bulk density of diamond grits:

(1). Size and its distribution.
(2). Grain shape.
(3). Inter-influence between grains.

Crystaline Completeness
1、Because of the different synthetically conditions, synthetic diamond has various crystal shapes, such as hexahedron, octahedron and dodecahedron, etc. Crystalline completeness affects greatly the strength of synthetic diamond and its products. Diamond grits with complete crystal shape have high strength and long duration, and vice versa. So crystalline completeness is an essential index of diamond grits quality.

2、 Crystalline completeness is measured by eyeballing, through observing the ratio of complete crystalline under electronic microscope, we can obtain the index of crystalline completeness.

Ratio of Hexahedron and Octahedron
1、 Because most synthetic diamond grits are in shape of hexahedron or octahedron, content of hexahedron and octahedron crystal has great effect on the strength of the synthetic diamond. By examining the content ratio of hexahedron and octahedron crystalline, we can get the strength index of synthetic diamond.

2、The content ratio of hexahedron and octahedron crystal can be determined by eyeballing. Observe and count the quantity of complete crystal of synthetic diamond through microscope, we can get the index of crystalline completeness.

Transparency
1、 Pure diamond is completely transparent in visible light. But in fact diamond, always with impurities and defects inside, absorbs visible light thus becomes less transparent. We can improve the raw materials and synthesis condition of diamond by researching Transparency which reflects the properties and existing status of impurities inside.

2、 Transparency is measured with Fluorescent Spectrum Analysis Instrument by irradiating diamonds with fluorescent spectrum and determining the average transparency.

Particle Size Distribution
Synthetic diamond was classified to grits and microns by different sizes. Diamond grits are measured by seizing and microns by microscope. According to sizes, big size diamond grits are used for drill bits, sawing blades, glass knives, dressing tools and wire-drawing dies, etc. Microns are used for PCD, fine grinding pads, grinding paste and free grinding tools. Other grade diamonds

1、 are used for various kinds of grinding wheels.

2、 Measurement by seizing: To put a certain weight of diamond into standard seize or electric shaped bolt, shake it for a certain time. Then measure the residues and determine if the diamonds conform to the standards.

3. Measurement by microscope: To observe the size of diamond with biology microscope or other stereoscopic microscope, and determine the distribution of particle sizes.

To ensure the best quality and performance of diamond tools, SUKAN selects the most suitable SUKAN diamond grits and microns for various kinds of applications. Above mentioned quality control process of diamond ensures the best performance can be reached. Furthermore, all tools manufactured by SUKAN undergo a strict and ongoing inspection procedure utilizing electronic, mechanical and optical measuring systems.

SUKAN improves the quality of diamond tools with customer’s help. While getting a lot of performance report of diamond tools on various kinds of working situation, we are continuously improving the tools to fit every specific working condition.