How to remove the parting line and flash from rubber sealing O-ring?

How to effectively remove parting line and flash from O-type rubber sealing ring?

In this case, we will discuss the finishing process of a rubber sealing ring to remove the parting line. The materials of this O-ring seal include silicone, nitrile rubber, fluorine rubber, Teflon, rubber, etc., and the finishing process is similar.

    • jerrylu
    • 2024-06-03


finishing effects of rubber, silicone, fluorine rubber, nitrile rubber, and Teflon O-ring seals to remove parting line, flash

1. The O-ring seal with the parting line before finishing
Rubber, silicone, fluorine rubber, nitrile rubber, Teflon O-ring seal surface parting line




Parting lines and flash.


O-shaped, diameters vary in size,
There are also prismatic circles.



Pre-finishing process:

Injection molding.

Post finishing process:

Drying and packaging.

2. Finishing requirements
  • Smooth surface, no parting line.
  • Deflashing
  • Reduce surface roughness, increase gloss, and improve brightness.
3. Details of the mold parting line removal process for rubber O-ring seals
Process steps (1) Rough finishing to remove parting line (2) Fine polishing (3) Drying
Machine and equipment centrifugal disc finishing machine tumbling barrel finishing machine vibratory dryer
Amplitude and speed full speed slow speed full speed
Tumbling media spherical heavy cutting ceramic media high-density porcelain media corn cob drying media
Tumbling media to workpiece ratio 4:1 6:1 8:1
Chemical finishing compound finishing liquid polishing liquid no
Water appropriate amount, the liquid level should not exceed the abrasive appropriate amount, the liquid level should not exceed the abrasive no
Finishing time 30 minutes 12 hours 30 minutes
Remark parts separated and picked up automatically, rinsing with water parts separated and picked up automatically, rinsing with water dry the water and wipe away the water stains
4. Effect after finishing and polishing
The polishing effect of rubber, silicone, fluorine rubber, nitrile rubber, and Teflon O-ring seals after removing the parting line
The finishing effect of rubber, silicone, fluorine rubber, nitrile rubber, and Teflon O-ring seals after removing the parting line

5. Additional information
  • Because the rubber material is soft, elastic and tough, heavy cutting force spherical ceramic deburring media is used to roughly finish the parting line. If you use ceramic media with sharp angles, such as triangular brown corundum deburring media, they may scratch the rubber surface, causing scratches, pitting and other problems on the product surface.
  • To achieve brightness on the rubber surface after rough finishing, it is necessary to use ceramic media with high density and no cutting force to achieve the polishing effect. It also requires slow work and fine work, so a barrel-type finishing machine is used.
  • Rubber will age again easily when exposed to water and air. Therefore, we need to dry the water immediately after polishing.

6. Final summary
  • In this case, we demonstrate a process of using spherical ceramic deburring media and high-density porcelain polishing media to remove the parting line from the rubber O-ring surface.
  • This process is also suitable for parting lines removing and polishing of injection molded parts, 3D printed parts, souvenirs, craft gifts and other products produced from silicone, fluorine rubber, nitrile rubber, Teflon and other materials.

Finishing process method for deburring, deflashing, trimming from plastic rubber silicone and nylon product parts

How to remove burrs,flash and finish plastic, rubber, silicone and nylon product parts?

During the injection molding process of rubber, plastic, silicone and nylon products, due to mold, process or raw material reasons, a large number of burrs and flash often occur on the edge of the product or in the inner hole. The existence of this burr phenomenon will have a negative impact on the surface quality of the product. The commonly used and simple method of deburring and trimming is to use a scraper for manual processing. Of course, this is only suitable for a small number of products. If large quantities of automated mechanical processing are required, since rubber, plastic, silicone, and nylon products are soft and tough, Conventional vibration/barrel finishing, electrolysis, plasma, and magnetic processes cannot achieve satisfactory results. Today we will share a case of how to deburr, deflash from rubber shin guard products to achieve high-efficiency trimming in large quantities. This finishing process is also suitable for trimming requirements of other plastic, polyester, silicone, nylon, aluminum alloy, zinc alloy and other product parts with soft, light and hard-to-break burrs such as mobile phone cases, watch bands, O-rings and other plastics.

    • jerrylu
    • 2024-05-21


Process method for deburring and deflashing on shin guards of rubber plastic products

1. The state of the rubber shin guards before deburring
How to deburr and deflash from rubber shin pad


Eucommia rubber


Long burrs, rough edge


Special shape


150*120 MM

Process before trimming:

Injection molding

Process after trimming:


2. Deburring and deflashing requirements
  • Batch deburring, deflashing, trimming
3. Detailed process of deburring and deflashing from rubber shin guards:
Process Steps (1) freeze deburring and deflashing
Mahines and Equipments deburring machine for plastic rubber products
Amplitude and Speed high speed
Finishing Abrasive Media plastic elastic sand
Ratio of abrasive to workpiece 4:1
Compound Liquid none
Water none
Process Time 10 minutes
4. Effect comparison of rubber shin pad after removing burrs
How to debur and deflash from rubber and plastic shin guards
Rubber plastic shin guards frozen deburring deflashing effect

5. Additional instructions
  • Due to process limitations, rubber, aluminum alloy, zinc alloy and other products made by injection molding, casting and other processes often have a long layer of burrs around them after molding. This kind of burr is very thin, easy to bend, and has a certain degree of toughness, so simple mechanical and physical removal methods are not effective. Nowadays, a special deburring and trimming machine for rubber and plastic products is used to place the workpieces in batches into a special barrel and roll them. During the processing, liquid nitrogen is added to reduce the surface of the workpieces to more than 100 degrees below zero in a short time, making the edges of the workpieces The burrs and flash will become brittle and broken, but the body of the workpiece will not be affected. While the workpiece is rolling, it is supplemented by high-speed moving plastic elastic sand abrasives that impact the surface of the product, which can accelerate the removal of burrs and rough edge on the edges of the product or inside the holes to improve the surface effect.
  • Another thing to note is that in order to test different processes, we divided the sample into four small pieces and finally determined the optimal deburring plan.

6. Final summary
  • In this case, we demonstrate an automated finishing and trimming process that uses a freezing process to remove burrs and flash from the outer surface and internal holes of rubber shin guards.
  • If you have problems with deburring, deflashing and trimming aluminum alloy, zinc alloy, rubber, nylon, silicone, plastic product parts or the following products using casting, injection molding and other processes and need professional technical support, you can refer to the above cases:
    How to deburr plastic
    Quickly remove burrs from plastic products
    Solution to burrs in injection molded parts
    How to remove plastic burrs and flash edges
    Deburring methods for plastic products
    How to quickly deal with plastic flash
    How to deal with plastic flash
    How to solve the problem of burrs on plastic products
    Deburring plastic products
    Tips for deburring plastic parts
    Rubber deburring process
    Advanced methods for rubber deburring
    How to quickly remove burrs from rubber products
    Rubber deburring equipment
    How to remove burrs from silicone
    Treatment method for silicone burrs

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