THE GROMMET JOURNAL
Practical perspectives on materials, applications and choosing the right rubber grommet.
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Materials. Profiles. Applications.Rubber compounds can change and decompose when exposed to severe heat. Burning behavior and smoke generation depend on the formulation, temperature, oxygen supply and other test conditions.
A flame retardant helps inhibit ignition or slow flame spread. Flame-retardant behavior is a property of a particular formulation under specified test conditions; it does not mean…
Rubber can be colored by incorporating a suitable colorant into the compound. Surface coatings are a different approach and need to be evaluated for adhesion, wear and…
Pigments provide color through particles dispersed in a rubber compound. Selecting a pigment involves more than matching a shade: the colorant must suit the polymer, cure process…
Color should be specified with an agreed reference and viewing conditions. A physical sample is useful because lighting, surface finish and translucency can affect the apparent match.
Vulcanization forms crosslinks in a rubber compound, helping it retain its shape and recover after deformation. The cure system and processing conditions affect the properties of the…
The chemical structure of an elastomer influences its properties, but it does not fully specify a finished grommet's performance. Side groups, comonomer composition and the crosslink network…
Thermal aging depends on more than the name of the base rubber. Polymer structure, cure system, fillers, protective additives and service conditions all affect the response of…
Oxidation can change a rubber compound's molecular structure and mechanical properties. Chain scission and additional crosslinking may both occur, with their relative effects depending on the formulation…
Rubber grommets can deform under load and recover when the load is removed. The extent of recovery depends on the compound, temperature, loading rate and time under…
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