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  • Crepe Rubber

Crepe rubber is either made from latex ("Latex Crepes") or processed from cup lumps, scrap and cuttings of ribbed sheet rubber ("Field Coagulum Crepes", or "Remilled Crepes").

Latex crepe is graded as "Pale Latex Crepe" (PLC, from fresh field latex) and "Sole Crepe" (SC, obtained from dried PLC). There are 8 grades under the PLC category, with the purest being 1X (the difference between tick and thin grades is only in thickness). Pale and sole crepes are more specialised than remilled crepes, and yield a higher premium. With both latex crepes, and especially the sole crepe, the colour represents an important element in marketing and pricing (a higher premium being obtained with a lighter coloured product).

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Remilled crepe rubber prepared from field coagulum materials fall into five categories (further graded on a visual basis):

  1. Estate Brown Crepe (EBC), thin and tick (made from lump and other high grade rubber scrap (field coagulam) generated on rubber estates) - 6 grades
  2. Thin Brown Crepe (Remills), (derived from wet slab coagulum, unsmoked sheets and cup lumps) - 4 different grades
  3. Thick Blanket Crepe (Ambers), (wet slabs, unsmoked sheets or other high grade scraps) - 3 grades
  4. Flat Bark Crepe, (processed from all types of low grades scrap including earth scrap) - 2 grades
  5. Pure Smoked Blanket Crepe, (exclusively derived from ribbed smoked sheet or cuttings)

For more information on the visual grading of crepe rubber, see the relevant section of the J&J Trade Links rubber grade section.

Crepes

Rubber in crepe form is processed from either latex (pale and sole crepe) or cup lumps, scrap and poor quality sheet rubber (remilled crepes). The traditional method of rubber processing to produce crepe rubber is similar to that for sheet rubber. An important additional step in making crepe rubber is the removal of yellow carotenoid pigments in the latex. In addition, the latex is coagulated by "fractional" coagulation: the first fraction is the unstable, yellow fraction processed into off-colour pale crepe of relatively low grade; the remaining latex is a wither material. The coagulum formed is then washed and fed to pairs of rollers rotating at different speeds, which manufacture the rubber into thin crepes. The crepes are dried in hot drying chambers or tunnels or on drying floors.

 

 
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