Ribbed smoked sheet

Characteristic Type HA Type LA Type XA Type HA creamed Type LA creamed Method of test 

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Two subgrades of SMR 5 are SMR 5RSS and SMR 5ADS, which are prepared by direct baling of ribbed smoked sheet and air-dried sheet (ADS), respectively. 

TSR 5. Within the Malaysian scheme SMR 5 is restricted to mbber derived from sheet material prepared by conventional processes, ie, ribbed smoked sheet (RSS), air-dried sheet (ADS), and unsmoked sheet (USS) and presented in small bale form. Other countries may source different raw materials, eg, Indonesia produces SIR 5 from thin latex coagulum (14). SMR 5 prepared by pressing dry-sheet material into standard bales must be identified by the type of sheet material, eg, SMR 5RSS, on the test certificate as well as on the wrapping. 

In solid form, the natural rubber is graded according to the content of dirt remaining from the precipitation of latex at the plantation. Eight basic NR types have been traditionally recognized internationally. Only the so-called ribbed smoked sheets and the pale crepes are normally used for adhesives. The predominant grade system, the Standard Malaysian Rubber system, has been used since 1965. 

Plantation rubber in the form of sheets which have been dried in an atmosphere of wood smoke and finally sheeted in a mill having rolls engraved with a ribbed design. Ribbed smoked sheet comprises about 60% of the output of a plantation. See Plantation Rubber. 

Ribbed smoke sheets White and pale crepes Estate brown crepes Compo crepes Thin brown crepes Thick blanket crepes Flat bark crepes Pure smoked crepe... 

Grade Ribbed, smoked sheets, pale (yellow) crepe brown crepe. 

Ribbed smoked sheet Coagulated sheets, dried, and smoked latex. Five grades available (RSS1-5)... 

RSS Ribbed Smoked Sheet DPNR Deproteinized Natural Rubber. 

Ribbed smoked sheet White and pale crepe Estate brown crepe Compo crepe Thin brown crepe Thick blanket crepe Flat bark crepe Pure smoked blanket crepe... 

Milled smoked rubber derived exclusively from ribbed smoked sheets... 

Ribbed smoked sheets (RSS) are made from intentionally coagulated latex. In this process, strained latex is diluted with water to 15% solids, strained again to remove particulate matter, and then coagulated by addition of an acid. The coagulum is compressed into 2-3 mm thick sheets and dried for 4-7 days in large smoke houses. 

There are several visually graded latex NRs, including ribbed smoked sheets (RSS) and crepes such as white and pale, thin and thick brown latex, etc. Two types of raw NR are field latex and raw coagu-lum, and these two types comprise all NR ( downstream ) grades. Depolymerized NR is used as a base for asphalt modifiers, potting compound, and cold-molding compounds for arts and crafts. 

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