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INTERNATIONAL STANDARD FOR RIBBED SMOKED SHEET (RSS) CLASSIFICATION

10/09/2020

 

RSS 1
Each bale must be packed free of mould but very slight traces of dry mould on wrappers or bale surfaces adjacent to wrapper found at time of delivery will not be objected to provided there is no penetration of mould inside the bale.
Oxidized spots or streaks, weak, heated, under-cured, over-smoked, opaque and burnt sheets are not permissible.
The rubber must be dry, clean, strong, sound and free from blemishes, resinous matter (rust), blisters, sand, dirty packing and any other foreign matter, except slight specks as shown in the sample. Small pinhead bubbles, if scattered, will not be objected to.
RSS 2
Slight resinous matter (rust) and slight amounts of dry mould on wrappers, bale surfaces and interior sheets, found at time of delivery will not be objected to.
Should “Rust” or “Dry Mould” in an appreciable extent appear on more than 5% of the bales sampled, it shall constitute grounds for objection.
Small bubbles and slight specks of bark to the extent as shown in the sample will not be objected to.
Oxidized spots or streaks, weak, heated, under-cured, over-smoked, opaque and burnt sheets are not permissible.
The rubber must be dry, clean, strong, sound and free from blemishes, blisters, sand, dirty packing and all other foreign matter other than specifed above as permissible.
RSS 3
Slight resinous matter (rust) and slight amounts of dry mould on wrapper, bale surfaces and interior sheet, found at time of delivery will not be objected to.
Should “Rust” or “Dry mould” in an appreciable extent appear on more than 10% of the bales sampled, it shall constitute grounds for objection.
Slight blemishes in color, small bubbles and small specks of bark permissible to the extent shown in the sample.
Oxidized spots or streaks, weak, heated, under-cured, over-smoked, opaque and burnt sheets are not permissible.
The rubber must be dry, strong and free of blemishes, blisters, sand, dirty packing and all other foreign matter other than specifed above as permissible.
RSS 4
Slight resinous matter (rust) and slight amounts of dry mould on wrappers, bale surfaces and interior sheets, found at time of delivery will not be objected to.
Should “rust” or “dry mould” in an appreciable extent appear on more than 20% of the bales sampled, it shall constitute grounds for objection.
Medium size bark particles, bubbles, translucent stains, slightly sticky and slightly over smoked rubber are permissible to the extent shown in the sample.
Oxidized spots or streaks, weak, heated, under-cured, over-smoked (in excess of the degree shown in the sample) and burnt sheets are not permissible.
The rubber must be dry, frm and free of blemishes, blisters, sand, dirty packing and all other foreign matter other than specifed above as permissible.
RSS 5
Slight resinous matter (rust) and slight amounts of dry mould on wrappers, bale surfaces and interior sheets, found at time of delivery will not be objected to.
Should “Rust” or “Dry Mould” in an appreciable extent appear on more than 30% of the bales sampled, it shall constitute grounds for objection.
Large bark particles, bubbles and small blisters, stains, over-smoked, slightly sticky rubber and blemishes of the amount and size shown in the sample are permissible. Slightly under-cured rubber is permissible.
Weak, heated, burnt, oxidized spots or streaks are not permissible.
The rubber must be dry, firm, free of blisters, except to the extent shown in the sample. Dirty packing, sand and all other foreign matter other than specifed above is not permissible.
Source: The Green Book. 1969. International Standards of Quality and Packing for Natural Rubber Grades.
 
Summary of Rubber Smoked Sheet Classification based on The Green Book
Based on the quality and permitted blemishes, RSS is categorized into grade 1 to 5, as follows:
Quality criteria
RSS Grade 1
RSS Grade 2
RSS Grade 3
RSS Grade 4
RSS Grade 5
Sticky/Dry
Dry
Dry
Dry
Slightly sticky
Slightly sticky
Smoking
Evenly smoked
Evenly smoked
Evenly smoked
Slightly over smoking acceptable
Over smoked
Blemishes on colour
Not permitted
Not permitted
Slight blemishes acceptable
Only medium sized translucent stain are permitted
Acceptable
Specks of bark
Not permitted
Slight specks acceptable
Small specks acceptable
Only medium sized particles are permitted
Large
Oxidized spots or streaks
Not permitted
Not permitted
Not permitted
Not permitted
Large
Pinhole bubbles
Acceptable, only if small and scattered
Only small bubbles are permitted
Only small bubbles are permitted
Only medium sized bubbles are permitted
Large bubbles and small blisters
Resinous matter and mould
Resinous matter and mould but negligible traces of mould is permitted on the wrappers of the bales or on the surface of the sheet immediately under the wrapper provide there is no penetration of mould inside the bale
Slight resinous matter (rust) and slight amounts of dry mould on wrapper, bale surface and interior sheets will not be objected to. Should “rust” or “Dry mould” in an appreciable extent appear on more than 5% of the bales sampled, it shall constitute ground for objection
Slight resinous matter (rust) and slight amounts of dry mould on wrapper, bale surface and interior sheets will not be objected to. Should “rust” or “Dry mould” in an appreciable extent appear on more than 10% of the bales sampled, it shall constitute ground for objection
Slight resinous matter (rust) and slight amount of dry mould on wrapper, bale surface and interior sheets will not be objected to. Should “rust” or “Dry” mould in an appreciable extent appear on more than 20% of the bales sampled, it shall constitute ground for objection
Slight resinous matter (rust) and slight amount of dry mould on wrapper, bale surface and interior sheets will not be objected to. Should “rust” or “Dry mould” in an appreciable extent appear on more than 30% of the bales sampled, it shall constitute ground for objection
Dirty packing/stains and other foreign matter
Not permitted
Not permitted
Not permitted
Not permitted
Not permitted
Source: The Green Book. 1969. International Standards of Quality and Packing for Natural Rubber Grades.

 



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