Frequently Asked Questions
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Rubber and other flexible parts... Should I Injection mould or Compression mould?
Flexible components are present in most assemblies. Whether you want a simple gasket, a seal, a more intricate connector, or a bellows, the common denominator is that the part is required to flex in its operation or assembly.
Rubber and flexible parts - how do I get the hardness I want?
Hardness is officially defined as “the resistance of a material to plastic deformation, usually by indentation. However, the term may also refer to stiffness or temper, or to resistance to bending, scratching, abrasion or cutting.”
What if I do not know the hardness I need?
Specifying a flexible part raises the immediate question of hardness, great if you can specify this, a problem if you can’t!
Plunkett Associates to the rescue!
How is hardness defined?
Tests have been developed that measure the resistance of plastics including the Shore® (Durometer) test and the Rockwell hardness test. Rubbers are frequently defined on the IRHD scale.
Natural & Synthetic Rubbers - what are they and how are they used?
Natural rubber is produced from latex, tapped off a rubber tree. Uncured, this rubber has limited application (e.g. adhesives, cements, etc.) and is unlike our expectation of what ‘rubber’ should be. However, after undergoing mastication, blending, calendering, extrusion and finally vulcanisation, it becomes the product we know.
When I need a flexible part how do I choose which process to use?
Your requirement will be unique to you and various factors will influence the decision including aesthetics, functionality, environment, porosity, hardness, and time.
What is the quickest method to get a flexible part?
Can I have a flexible part in rubber, silicone, EPDM or Viton?
In a simple world only one material would be required for our flexible component needs. In the real world we often have requirements for materials as diverse as rubber, EPDM, Viton etc.
What is the effect of quantity, if I only want 1 part or maybe 100 flexible parts?
The effect of increasing quantities can be dramatic if the wrong process is selected.
My part is a simple 2D shape, is there a simple way to produce it?
Flexible components of simple 2D geometry can sometimes be profiled using water jet or laser technology from stock materials.