Rubber Grommet Seal
Rubber Grommet Seal, also known as Rubber Grommet Plug, Rubber Sleeve Grommet, Rubber Cable Grommet, Rubber Hole Grommets or Rubber Wire Grommet, which are widely used to protect wires, tubes from harm of abrasion damage. Silicone rubber Grommets are also usually used as vibration dampers, finishing components and even spacers. When the size is right, rubber grommets can easily snap into the pre-drilled panel hole. Silicone grummets perform very well with plastic, metal or other materials.
Rubber Grommet Seal Material
Rubber Grommet Seal can be made from SBR, NBR, EPDM, CR and Silicone. Hardness from 35 to 80 shore A. The most popular material is SBR 65+/-5 Shore A. For special purpose rubber grommets, such as good aging, high temperature resistance….. silicone rubber is a better choice.
EPDM Rubber Grommet Seal have excellent Ozone aging resistance , Weather aging resistance & Heat resistance.
Nitrile Rubber Grommet Seal have Excellent oil resistance, good wear resistance, good temperature resistance & good adhesiveness, while there are also disadvantages of NBR grommet, like Poor low-temperature & ozone resistance, Poor insulation, and low elasticity.
SBR Rubber Grommet Seal, Compared with NR, it has better abrasion resistance, anti-aging stability and heat resistance. However, SBR Rubber Grommet Seal itself also withstands some disadvantages, like low elasticity, poor flexibility resistance, tear resistance and processing. Especially, the self-adhesion is poor and the raw rubber strength is low. Its working temperature range is 50℃~100℃.
Neoprene Rubber Grommet Seal features Good Physical Properties, Oil resistance, heat & flame resistance, sunlight resistance, ozone resistance, acid and alkali resistance and chemical resistance.
Silicone Rubber Grommet Seal has good high temperature & low temperature resistance and weathering and ozone resistance, but its abrasion resistance and oil resistance is not so good.
Rubber Grommet Seal Design Guide
E- Rubber Grommet groove width should approximately match the thickness of the installation wall.
B- Rubber Grommet groove diameter should approximately match the installation hole size.
A, C and D- Rubber Grommet dimensions are typically less critical depending on the application.
Rubber Grommet Seal Production Process
Rubber Grommet Seal designs with hole or undercuts, so it will require to add a middle plate. 2 plate mold tools consist of one parting plane and mold splits in two halves. Whereas three plate mold consist of two parting planes and mold splits in three sections as the followed picture shows:
Being a tool of increased complexity, the three-plate mould is, therefore, more time-consuming and expensive to manufacture than its two-plate cousin.
Rubber Grommet Seal Application
Rubber Grommet Seals are usually used to cover the rough and sharp edges of a hole in metal. Rubber grommet seals are also important parts in automotive applications. They are used to protect lines, wires and cables from chafing or grazing on rough surfaces. They can also effectively reduce vibration and are used to seal different important under-the-hood and body applications. In general, rubber grommets seals are more commonly used to protect or cover holes and to protect cables or wires from sharp corners or edges.
Rubber Grommet Seal Shapes
Rubber Blanking Grommets
Blind Rubber Grommets
Square Rubber Grommet
Oval Rubber Grommet
Closed Rubber Grommets
Rectangular Rubber Grommet
Open Rubber Grommets
Round Rubber Grommets
Rubber Grommet Seal Parting Line
Rubber grommet parting line & joint line location, not only depends on grommet designs & sizes, but also on grommets hardness & durometer.
Grommet parting line demands affect grommet's molding price and unit price.