M.E.C. GUM ®
The compositions, pratical performance, low cost, hardness, elasticity and finish of the sheets and mats illustrated in the present catalogue makes them ideal for almost typical applications.
When choosing a product grade it is very important to consider exposure to:
- natural agents (light, ozone etc.)
- chemical agents (oil, fats, fuel, acids, solvents, etc.)
- physical agents (high and low temperatures)
- mechanical agents (abrasive action, repeated stresses, heavy loads).
An inappropriate choice could lead to a rapid deterioration of the original characteristics.
ACTION OF NATURAL, CHEMICAL, PHISICAL AND MECHANICAL AGENTS
The catalogue lists conditions of use in relation to the agents defined above. If the foresen use of a product involves contact with agents not included here, contact us in order to select the most suitable product.
PHISICAL -- MECHANICAL CHARACTERISTICS
Unit of measurement SHORE A in compliance with standard ASTM D 2240 - 64 T. It is only valid if the measurement is made on a thickness of 4 mm. If measurements are made on thinner or thicker samples the figures vary and are invalid, particularly in the case of rubber with low hardness grade.
For sheets with ply inserts, the hardness figures are only indicative.
Unit of measurement gr/cm3 reppresenting the weight in kg of a sheets with a surface area of 1 square meter and a thickness of 1 mm. It therefore determines the volumetric yield of the product, with very important economic implications.
Unit of measurement kg/cm2 in compliance with standard ASTM D 412 C.
Indicates the force per unit of surface that will break the rubber.
Unit of measurement % (percentage), in compliance with norm ASTM D 412 C.
It indicates the percentage ratio between the length at the moment of breaking and the initial length of the rubber.
Unit of measurement Kg/cm in compliance with norm ASTM D 624 B.
Indicates the force per unit of length that tears or splits the rubber.
RESIDUAL DEFORMATION AFTER COMPRESSION
Unit of measurement % (percentage), in compliance with norm ASTM D 395 B. Indicates permanent residual deformation in relation to the original thickness of the sheets after a technical crushing test at specific temperature and for a given time.
Unit of measurement mm3 ABRADED, in compliance with standard DIN 53516. Indicates the degree of resistance of the rubber to abrasion, in cubic millimetres of abraded material from the test sample.
Unit of measurement °C (degrees centigrade). Indicates the minimum and maximum temperatures that must not be exceeded in the continuous use of the slabs.
Unit of measurement °C (degrees centigrade). Indicates the degree of brittleness of a sheets. Beyond this temperature the elastomer breaks very easily and looses all its elastic qualities.
The surface of the sheets can be smooth or impressed with ply.
The impression is achieved with special plies that produce an even imprint without visible irregularities.
SHEETS AND MAT ROLL FORMATS
The relevant lengths and widths of the rolls are indicated for each type of sheets and matting.
The hardness figures given are valid within a tolerance of ± 5 SHORE A points.
Thicknesses have tolerance in compliance with standard ASTM D 1330 - 59 (1965):
Thicknesses up to 1,50 mm ± 0,25 mm
Thicknesses from 1,60 mm to 1,90 mm ± 0,30 mm
Thicknesses from 2,00 mm to 3,90 mm ± 0,40 mm
Thicknesses from 4,00 mm to 20,00 mm ± 0,80 mm
Thicknesses above 20,00 mm ± 1,00 mm
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