The sisal is sorted according to its length, color and impurity rate. In order to sort according to its length, the sisal is classified per class, as follows:
Extra long (EL): fiber of length above 1,10 m (one meter and ten centimeters)
Long (L): fiber of length above 0,90 m (ninety centimeters) up to 1,10 m (one meter and ten centimeters)
Medium (M): fiber of length above 0,70 m (seventy centimeters) up to 0,90 m (ninety centimeters)
Short (C): fiber of length of 0,60 m (sixty centimeters) up to 0,70 m (seventy centimeters).
In order to sort according to its color and impurity rate, the sisal is classified by types:
Constitutes of dry fibers, well brushed, of light-cream to yellow color, in great maturity stage, soft, bright and resistant, stains with small color variation, maximum humidity rate of 13,5%, well untangled, without impurities, knots, pieces of leaves and barks or any other kind of defects. Even though the Ministry of Agriculture does not consider any impurity rate, the international market accepts up to 1% impurity, due to the great difficulty to produce this type of sisal because of the extraction conditions on the fields.
Constitutes of dry fibers, well brushed, yellow to brownish color, with small green areas, in good maturation stage, bright, resistant, a little rough, maximum humidity of 13,5%, well untangled, without knots and barks. Usually this fiber presents an impurity percentage not superior to 2%. It is acceptable up to 10% of medium fibers (71-90 cm)
Made up of dry fibers, well brushed, yellow color, with small greenish and reddish areas, in good maturation stage, bright, resistant, rough, with some stains with color variation, maximum humidity of 13,5%, well untangled, without knots and barks. Normally this fiber presents an impurity percentage of approximately 3,5% and a color variation more noticeable than the one in type 2. It is acceptable up to 20% of medium fibers (71-90 cm).
This type of sisal is not included in the norms of the Ministry of Agriculture and its concept was established due to the practices of commerce. Constitutes of sisal which cannot be classified as type 3, because it has a much accentuated variation in color, length, and impurity rate, but, at the same time, as it constitutes of many fibers of above 60 cm, it cannot be classified as refugo.
It is also not in included in the norms of the Ministry of Agriculture and, like type 4, its concept was established due to the practices of commerce. Constitutes of sisal of same characteristics of type 4, however, with a superior hence more noticeable impurity, color and length variation.
Sisal fibers of length less than 60 cm or that attributes are not within the ones mentioned. It constitutes of a sub-product of the brushing process of the sisal fiber.
Constitutes of fibers of uniform light-cream color, in excellent conservation condition, maximum humidity of 14%, originated from the drying, brushing and revision processes, without any strange materials but with knots. In order to attend to the request of customers, Hamilton Rios developed a selection process of the bucha that eliminates any knots. Thus, the bucha of mark RISANA is 100% exempted of knots.