RKB/W Deburring Plastic Media

RKB/W plastic media is preformed plastics, the other workhorse media, are also available in a variety of grades or bodies, with some manufacturers having nine grades while others have as few as three.

This media is formed by bonding abrasives (generally 40-70% by weight) into polyester, usually by casting. After casting, this media is typically pre-tumbled to remove flash. The plastic media is softer, has a lower density than preformed ceramic media, provides a cushioning effect, and sometimes has a shorter life. It is well suitable for finishing softer metals and fragile parts, achieving pre-plating requirements, and producing smooth finishes as low as 5 micrometres. During finishing the matrix which is softer than the abrasive, is eroded, leaving the abrasive to perform the desired work, While some users believe it assures parts free of impingement, this is not true, All the mass finishing processes expert for fixtured or compartmentalized operations allow part-on-part contact. Plastic media can also be produced in a wide variety of desirable shapes. In practice, over a decade some shapes go out of favour and new ones emerge.

Plunge polishing machine car wheel polishing_plastic media grinding

Inovatec noted that the plastic media provides no surface hardening of the workpieces. In addition, plastic media is also quieter than abrasive chips.

If you are familiar with the world of metal works, you should know what vibratory finishing is. It’s usually the final step in any type of metal crafting where all unwanted edges and burrs are removed while giving it a polished look.

It’s obvious that you need something to grind the metal down. It’s done using a ‘media’. There are different types of media with different shapes and sizes. In this article, we’ll focus on plastic deburring media and we’ll know all there is about plastic deburring media.

What is Plastic Deburring Media?

Before jumping into the details of plastic deburring media, it’s important to get a good grasp of deburring media in general is. A deburring media is simply an object that is used with vibratory finishing machines to smoothen the metal.

Plastic tumbling media

When the media is made of plastic, it’s known as plastic deburring media. Plastic is one of the most commonly used material when it comes to deburring media. It’s lightweight and it doesn’t damage the material or change its colour as well.

Another reason behind the popularity of plastic deburring media is the wide availability. As it’s synthetically made rather than derived from natural resources, it’s easy to make and easy to get. Plastic deburring media is polyester-based with a blend of abrasive.

The plastic and abrasive particles bond together to achieve the ultimate finished look. The abrasives are a mix of different particles that form different formulations. Each formulation is suitable for different types of tasks. Whether you’re using the plastic deburring media on hard metal like steel or a soft one like aluminium will determine the type of abrasive found in the media.

The most common abrasive types are silicon carbide, silica, zirconium and aluminium oxide. For hard metals like steel, you should go for a plastic deburring media that has silicone carbide or aluminium oxide in it. For soft metals like aluminium or brass, go for the ones that come with silica. Zirconium is for fine grinding and works great on all types of media.

Types of Plastic Deburring Media

You can get your hands on the high-density, low density and high-performance formulations of plastic deburring media. These media are designed to cover almost all types of finishes you can hope for. All of the formula guarantee consistency of performance and extended life.

plastic deburring media

  • High-Density Media: A plastic deburring media designed to work on both ferrous and non-ferrous metals. They offer stock removal and a superior cut. These high-density plastic deburring media are great for reducing processing time. The final product is very smooth and polished. They come in all shapes and sizes to be applicable to big chunks of metal to intricate small parts.


  • Low-Density Media: These are general purpose media used for flash removal, deburring and pre-plate finishing. The low-density media wear very less and remove plenty of metal in a decent time frame.


  • High-performance Media: Mostly applicable to ferrous metals, high-performance plastic deburring media is designed for specific purposes. They usually cost more than regular plastic deburring media and provide an extraordinary finish to your part’s surface.

Shape and Size of Plastic Deburring Media

Choosing the right shape and size of a plastic deburring media is very important to get the finishing you want. Plastic deburring media comes in a wide variety of shapes. It’s going to take a few tries before you can hit the perfect one if you’re just starting out.

The shape of the product you are going to use the media on will determine the type of plastic deburring media. In general, round and oval media is preferred over other shapes. The rounded surfaces help the media to wear evenly and create fewer chips. Cylindrical and rounded plastic deburring media is less likely to be lodged into the parts.

plastic deburring media

Then there are arrowheads, triangles, and tri-star shapes. These shapes are perfect if your product has a complex structure and a lot of hard to reach spots. But there is a catch. The triangular and arrowhead plastic deburring media are more likely to wear unevenly and have a high rate of chipping.

Size is another very important factor in choosing the right plastic deburring media. Remember, the smaller the media, the smoother the surface. As small media size has a better chance to contact and rub against the part’s surface, they create a smoother and better look. Although the processing time is longer due to the gentle approach, the wait is worth it.

Large-sized plastic deburring media, on the other hand, provides a rougher surface. If you’re going for a rough look for your part, use the large media by all means. If not, it’s better to stick to the small ones.

Applications Plastic Deburring Media

Plastic deburring media in a surface finishing machine has a wide array of applications. Plastic deburring media can smooth rough surfaces, break edge radius, blend tooling paths, deburr, polish, reduce sharpness, etc.

tumbling media for aluminum

Plastic deburring media is best used with soft materials like aluminium, brass, etc. Plastic deburring media also works with plastic parts as well. The purpose of plastic deburring media is to achieve a smooth surface, not a shiny one.

Vibratory media like plastic deburring media can also be classified as low cut, no cut, fast cut, medium cut, very fast cut or ultra-fast cut. But the most common 3 types would be the medium cut, light cut, and very fine cut.

The brown ones you see are the medium cut. The green ones are light cut and the white plastic deburring media are the very fine cut ones.


Plastic deburring media is on par with ceramic deburring media when it comes to the availability and effectiveness of deburring media. Plastic deburring media is easy to get and easy to work with. They provide a great finish to soft metal surfaces while reaching the hard spots effortlessly. They work great with both vibratory finishing machines and tumbling finishing machines.

We, Inovatec Machinery, are your go-to place when it comes to deburring media and surface finishing machines. We produce the best quality of plastic tumbling media for our customers. You’re most welcome to check out our inventory and get your supplies.

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