what grit diamond paste?

Diamond paste, also known as diamond polishing compound or diamond lapping compound, is a specialized abrasive compound containing micron-sized synthetic diamond particles. It is widely used for polishing, lapping, and honing various materials to achieve a high degree of surface finish and precision.

 

Below is the classification and corresponding particle size information for diamond paste grits:

• 200,000 Grit: 0 to 0.1 microns, polishing paste, the finest polish.
• 100,000 Grit: 0 to 0.25 microns, polishing paste, final polish.
• 50,000 Grit: 0 to 0.5 microns, polishing paste, final polish.
• 14,000 Grit: 0 to 1 micron, polishing paste, final polish.
• 8,000 Grit: 0 to 2 microns, polishing paste, mirror finish.
• 5,000 Grit: 1.5 to 3 microns, polishing paste, mirror finish.
• 4,000 Grit: 2 to 4 microns, polishing paste, mirror finish.
• 3,000 Grit: 3 to 6 microns, polishing paste, fine polish.
• 2,000 Grit: 4 to 8 microns, polishing paste, fine polish.
• 1,500 Grit: 6 to 12 microns, polishing paste, pre-polish, fine lapping.
• 1,200 Grit: 12 to 20 microns, lapping paste, lapping metals.
• 1,050 Grit: 10 to 16 microns, lapping paste, lapping metals.
• 800 Grit: 12 to 22 microns, lapping paste, stock removal or lapping metals.
• 600 Grit: 22 to 36 microns, lapping paste, stock removal or lapping metals.
• 500 Grit: 36 to 54 microns, lapping paste, medium-fast lapping.
• 400 Grit: 54 to 80 microns, lapping paste, medium-fast lapping.

 

 

The grit of diamond paste refers to the size of the diamond particles. The lower the grit number, the larger and coarser the particles; conversely, the higher the grit number, the smaller and finer the particles. Different grits are suitable for different applications. Typically, coarser grits are used for initial material removal, while finer grits are employed to refine the surface to a high degree of smoothness. For example, to polish shallow scratches on ceramic tiles, a set of 4,000, 8,000, and 50,000 grit polishing pastes might be used, whereas for epoxy resin polishing, a 200,000 grit polishing paste is recommended.

 

Diamond paste is primarily composed of two main components: diamond particles and a carrier medium. The diamond particles can originate from natural or synthetic diamonds and are ground to precise sizes to achieve the desired grit. The carrier medium, which suspends the diamond particles, can be oil-based or water-based. Some formulations may also include additives to enhance properties such as lubricity, adhesion, or longevity.

 

The carrier medium in diamond paste serves to suspend the diamond particles and evenly distribute them throughout the paste. This uniform distribution ensures consistent abrasion during the polishing process and prevents uneven wear on the polishing tool and workpiece, resulting in a smoother finish. Oil-based diamond paste typically uses mineral oil or synthetic oil as the carrier medium and is suitable for applications where water might cause corrosion or is incompatible with the materials being polished. Water-based diamond paste uses water as the carrier medium and is often chosen when water is readily available and compatible with the workpiece material. Water-based diamond paste is also easier to clean up after use compared to oil-based versions.

Diamond paste is available in three types: oil-soluble, water-soluble, and universal. Its versatility allows it to be suitable for different materials under various conditions. Factors such as the uniformity of particle size, the substance used as the carrier, and the hardness of the workpiece influence its performance. By selecting the appropriate type, diamond paste can deliver consistent and remarkable results.

 

When using diamond paste, it is generally applied to a polishing tool such as a felt bob, cloth pad, or polishing wheel. The paste-coated tool is then used to work on the surface of the mold in a controlled and systematic manner. The pressure, speed, and duration of the polishing process can be adjusted to achieve the desired results. Mold polishing with diamond paste typically involves multiple stages, progressing from coarser to finer grits. Each stage removes imperfections left by the previous one, gradually improving the surface quality.

 

Below is a brief guide on the applications of different grit diamond pastes:

• Coarser grits (e.g., 400 grit): Suitable for medium-fast lapping, stock removal, or lapping metals. These grits are ideal for initial material removal on hard materials like metals, ceramics, and glass.
• Medium grits (e.g., 1,500 grit): Used for pre-polish and fine lapping. These grits can remove medium-sized scratches and marks, refining the surface to a certain extent.
• Fine grits (e.g., 3,000 grit): Suitable for fine polishing. These grits can achieve a high-gloss finish on materials like metals and gems.
• Ultra-fine grits (e.g., 200,000 grit): Ideal for the finest polishing. These grits can produce a mirror-like finish on soft materials like epoxy resin.

 

When selecting diamond paste, it is important to consider the material being polished and the desired surface finish. For hard materials, coarser grits can be used initially, followed by progressively finer grits. For soft materials, fine grits with smaller diamond particles should be chosen. The surface condition of the workpiece also matters. The rougher the surface, the coarser the grit required. As the current compound becomes ineffective, it is time to switch to the next finer grit. Gradually, unwanted scratches and unevenness can be eliminated to achieve a dazzling mirror shine.

 

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