Pumice Grit

Benefits

• Friable and Abrasive
• Gentle and Low Bulk Density
• Chemically Benign
• Low Damage to a Variety of Surfaces
• Available From Large Particles to Ultra-Fine Grades
• High Control Over Surface Finish

Applications

• Polishing Metal and Plastic Surfaces
• Grinding and Polishing Glass
• Tooth and Denture Polishing
• Rubbing Compounds for Removing Scratches
• Tumbling Plastic Parts for Highly Polished Finishes
• Cleaning Circuit Boards and Sensitive Electronics
• Blast Cleaning Sensitive Surfaces and Buildings
• Hand Soaps, Foot and Hand Scrubs, and Exfoliating Creams

Pumice blasting provides controlled abrasive action for sensitive surface cleaning. Its low bulk density and friable structure make it useful where aggressive media may cause unwanted surface alteration. Pumice abrasive can remove surface contaminants while supporting a controlled finish.

Pumice Grit for Delicate Surface Preparation

Pumice grit can be used for cleaning soft metals, plastics, wood, historic structures, and other surfaces where surface preservation is important. Pumice Blasting Media provides a mild cutting action that can help remove rust, scale, grime, and selected coatings.

The natural friability of pumice allows particles to break down during use rather than behaving like a highly aggressive, durable abrasive. This characteristic can be useful when the goal is controlled cleaning rather than deep surface profiling.

Pumice Stone Grit and Particle Selection

Pumice stone grit should be selected according to the substrate, contaminant, equipment, and desired finish. Coarser grades can provide stronger cleaning action, while finer grades can be used where more controlled polishing or finishing is required.

When selecting pumice stone grit, operators should consider the particle-size range and the sensitivity of the surface. Kramer Industries offers grades from larger particles through ultra-fine grades for different abrasive and polishing requirements.

What Grit Is a Pumice Stone?

What grit is a pumice stone depends on how the natural material is processed and graded. Pumice products can range from coarse particles to very fine powders, so there is no single grit size for every pumice stone.

The phrase what grit is a pumice stone is often used to describe the relative coarseness of a pumice product. For blasting or polishing, the required grade should be selected based on the application rather than the name of the material alone.

Pumice Stone Hardness

Pumice stone hardness varies by source and structure, but Kramer’s blasting-media guide classifies Pumice Grit at approximately 6–7 on the hardness scale. The porous volcanic structure and friability also influence how the abrasive behaves during use.

Understanding pumice stone hardness helps explain why the material can provide abrasive action while remaining suitable for many delicate cleaning and finishing applications.

Pumice for Polishing and Tumbling

Pumice Abrasive is used for polishing metal and plastic surfaces, grinding and polishing glass, tumbling plastic parts, and producing highly polished finishes. Hess Pumice also describes pumice as a useful tumbling and polishing media for precision parts and delicate items.

Pumice Blasting Media can also be used for cleaning circuit boards and sensitive electronics. Its low bulk density and mild abrasive action can support cleaning where protecting fine components and surface details is important.

Pumice for Sensitive Electronics and Buildings

Pumice blasting can be used for cleaning sensitive electronics and selected building surfaces. Hess Pumice describes pumice as a gentle abrasive for sensitive high-pressure blasting applications, including restoration cleaning of historic buildings.

Pumice Grit can also be used for polishing and preparing sensitive components. Its non-conductive nature makes it useful around electronic components and circuitry when the application and blasting process are properly controlled.

Choosing Pumice Abrasive

When choosing Pumice Abrasive, consider the material being cleaned, the contaminant being removed, the required final surface, the blasting equipment, and the desired level of surface preservation. These factors determine whether a coarse, medium, fine, or ultra-fine grade is appropriate.

Kramer Industries provides Pumice Grit in multiple grades for blasting, polishing, grinding, and tumbling applications. Pumice abrasive selection should focus on achieving the required cleaning or finishing result without unnecessary surface alteration.

Pumice Compared With Harder Abrasives

Pumice Abrasive is generally selected when a milder abrasive action is preferred. Unlike harder, denser abrasives designed for aggressive cutting or deep profiling, pumice provides a lightweight and friable alternative for applications where surface preservation matters.

The appropriate media depends on the substrate, contamination, desired finish, and equipment. Pumice Blasting Media can be a practical choice for delicate cleaning, polishing, and restoration applications.