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Crepe is a crinkly lace rubber, obtained when coagulated latex or any form of field coagulam (tree lace, shell scrap, and earth scrap etc.) is passed several times through heavy rolls called crepers and the resultant material air dried at ambient temperature. There are different types of crepe rubber depending upon the type of starting materials from which they are produced. The different types of crepe rubbers, for which grade descriptions are given in the Green Book are the following:
   
   
  Among these forms types, the first three are in the dry form and almost of the total NR produced in the world is at present marketed in these 3 forms.  
 
   
Sheet Rubber   Crepe Rubber   T.S.R
         
       
Preserved Latex        
 
     
 

PALE LATEX CREPE

There are 8 grades under this category. All these grades must be produced from the fresh coagula of natural liquid latex under conditions where all processes are carefully and uniformly controlled. The rubber is milled to produce thin and thick crepes. The grade descriptions for the various grades are as given below:
 
  • No : IX Thick pale crepe
  • No : IX Thin pale crepe
  The difference between the grades is only in thickness. Deliveries of the grades must consist of dry, firm rubber of very light uniform colour. Discoloration, regardless of cause, dust, specks, sand or other foreign matter, oil or their stains, or any evidence of oxidation or heat, not permissible.
 
  • No.1 Thick pale crepe
  • No.1 Thin pale crepe
  Deliveries must consist of dry, firm rubber of light colour with very slight variation in shade permissible. Discoloration, regardless of cause, dust, specks sand or other foreign matter, oil or other stains or any evidence of oxidation or heat not permissible.
 
  • No.2 Thin pale crepe
  • No.2 Thick pale crepe
  Deliveries must consist of dry, firm rubber, slightly darker than No.1 Thick or Thin pale crepe with slight variation in shade permissible. Slightly mottled rubber will not be objected to provide this condition does not exist in more than 10% of the number of bales included in the delivery, lot or tender as determined by the number of bales inspected. Discoloration, regardless of cause, dust, specks, sand or other foreign matter, oil or other stains or any evidence of oxidation or heat, not permissible, other than those specified above as permissible.
 
  • No.3 Thick pale crepe
  • No.3 Thin pale crepe
  Deliveries must consist of dry, firm rubber of yellowish colour with variation in shade permissible. Mottled and streaked rubber are permissible provided this condition does not exist in more than 20% of the number of bales included in the delivery, lot or tender as determined by the number of bales inspected. Discoloration, regardless of cause, dust, specks, sand or other foreign matter, oil or other stains or any evidence of oxidation or heat, not permissible other than specified above as permissible.
   

 

ESTATE BROWN CREPE

There are six grades under this category. All these grades are made from lump and other high grade rubber scrap (field coagulum) generated on rubber estates. Tree bark scrap, if used must be pre-cleaned to separate the rubber from the bark. Power wash mills are to be used in milling these grades into a form of thick and thin brown crepes. The grade descriptions for the different grades of Estate Brown Crepes are as follows:
 
  • No : IX Thin Brown Crepe
  • No : IX Thick Brown Crepe
  The difference between the grades is only in the thickness. For these two grades, deliveries must consist of dry, clean rubber light brown in colour. Discoloration, regardless of cause, specks, sand or other foreign matter, oil or other stains or any evidence of oxidation or heat not permissible.
 
  • No.2x Thin Brown Crepe
  • No.2x Thick Brown Crepe
  For both these grades deliveries must consist of dry, clean rubber brown light in colour. Discoloration, regardless of cause, specks, sand or other foreign matter, oil or other stains or any evidence of oxidation or heat, not permissible.
 
  • No.3x Thin Brown Crepe
  • No.3x Thick Brown Crepe
  For both these grades, deliveries must consist of dry rubber brown to dark brown in colour. Discoloration, regardless of cause, specks, sand or other foreign matter, oil or other stains or any evidence of oxidation or heat, not permissible, except little specks of bark which will not be objected to.
   

 

THIN BROWN CREPES (Remills)

There are 4 different grades coming under this category. These grades are manufactured on power wash mills from wet slab, unsmoked on estates or small holdings. Tree bark scrap, if used must be pre-cleaned to separate the rubber from the bark. Earth scrap and smoked scrap are not permissible in these grades. The grade descriptions for the different grades coming under this category are as follows:
 
No: 1 Thin Brown Crepe
  Deliveries must consist of dry, clean rubber, light brown in colour. Mottled rubber permitted to some extent. Discoloration, regardless of cause, sludge, specks of bark, sand, dirty packing, or all other foreign matter, oil or other stains or any evidence of oxidation or heat not permissible.
 
No: 2 Thin Brown Crepe
  Deliveries must consist of dry, clean rubber, light to medium brown in colour. Mottled rubber permitted, to a little more in extent. Discoloration, regardless of cause, sludge, specks of bark, sand, dirty packing, or all other foreign matter, oil or other stains or any evidence of oxidation or heat not permissible.
 
No: 3 Thin Brown Crepe
  Deliveries must consist of dry, clean rubber medium brown to medium dark brown in colour. Mottled rubber permitted. Discoloration, regardless of cause, sludge, specks of bark, sand, dirty packing, or all other foreign matter, oil or other stains or any evidence of oxidation or heat not permissible.
 
No: 4 Thin Brown Crepe
  Deliveries must consist of dry rubber, medium dark brown to dark brown in colour. Mottled rubber and small minute specks of barks will not be objected to. Discoloration, regardless of cause, sludge, sand, dirty packing, or all other foreign matter, oil or other stains or any evidence of oxidation or heat not permissible.

 

THICK BLANKET CREPES (Ambers)

There are 3 grades under this category. These grades are manufactured on power wash mills from wet slab, unsmoked sheets, lump and other high grade scrap generated on estates or small holdings. Tree bark scrap, if used must be pre-cleaned to separate the rubber from the bark. Earth scrap is not permissible in these grades. The grade descriptions of the 3 different grades coming under this category are as follows:
 
No: 2 Thick Blanket crepe(Amber)
  Deliveries must consist of dry, clean rubber, light brown in colour. Mottled rubber permitted to some extent. Discoloration, regardless of cause, sludge, specks of bark, sand, dirty packing or all other foreign matter, oil or other stains or any evidence of oxidation or heat not permissible.
 
No: 3 Thick Blanket crepe(Amber)
  Deliveries must consist of dry, clean rubber, medium brown to brown in colour. Mottled rubber permitted. Discoloration, regardless of cause, sludge, specks of barks, sand, dirty packing, or all other foreign matter, oil or other stains or any evidence of oxidation or heat not permissible.
 
No: 4 Thick Blanket crepe(Amber)
  Deliveries must consist of dry rubber, brown to dark brown in colour. Mottled rubber permitted. Discoloration, regardless of cause, sludge, specks of bark, sand, dirty packing or all other foreign matter, oil or other stains or any evidence of oxidation or heat not permissible.

 

FLAT BARK CREPES

There are two grades of rubber under this category. These grades are produced on power wash mills out of all types of scrap natural rubber in uncompounded form including earth scrap. The descriptions of these two grades are as follows:
 
Standard Flat Bark crepe
  The rubber must be dry, very dark brown to black in colour is medium hard to soft in texture. Sludge, cotton, sand, dirty packing, and other foreign matter, except fine bark particles not permissible. Heated and discolored rubber not permissible.
 
Hard Flat Bark crepe
  The rubber must be dry, very dark brown to black in colour and is produced in the form of thick, firm, comparatively tough crepe. Sludge, cotton, sand, dirty packing and other foreign matter, except fine bark particles, are not permissible. Heated and discolored rubber not permissible.

 

PURE SMOKED BLANKET CREPES

This grade is made by milling on power wash mills smoked rubber derived exclusively from Ribbed smoked sheet (including block sheets), or Ribbed smoked sheet cuttings. No other type of rubber shall be used and no non-rubber material shall be added. Rubber of this type must be dry, clean, firm, and tough and retains an easily detectable smoked sheet odour. Sludge, oil spots, heat spots, sand, dirty packing and foreign matter not permissible. Colour variation from brown to very dark brown permissible.