Descripción
Los densímetros son el estándar aceptado para medir la porosidad, la permeabilidad al aire o la resistencia al aire de materiales laminares como papeles, tejidos, plásticos y membranas. Se dispone de varios modelos para analizar una amplia gama de materiales.
La prueba del densímetro mide el tiempo que tarda un volumen determinado de aire en fluir a través de un área estándar de material bajo una ligera presión uniforme. La presión del aire es suministrada por un cilindro interior de diámetro específico y peso estandarizado, que flota libremente dentro de un cilindro exterior parcialmente lleno de aceite para actuar como sello de aire. El material a ser ensayado se coloca entre placas de sujeción con un orificio circular con un área de 1,0 pulg2 (estándar), 0,25 o 0,1 pulg2 (opcionales).
- Densometers are the accepted standard for measuring the porosity of materials such as papers, wovens, plastics and membranes.
- All Densometers measure the time required for a given volume and of air (25cc to 400cc) to flow through a standard area of material being tested under light uniform pressure.
- Certain models, such as the S-P-S Tester, are also used to measure surface smoothness and material softness.
- Manual and automatic units available. Conform to TAPPI T-460, ASTM D-726-58 & APPITA/AS 1301-420, BS 5926, CPPA D-14, ISO 5636/5, D-202-77, SCAN P-19 & P-53.
Specifications
The Densometer test measures the time required for a given volume of air (25cc to 300cc) to flow through a standard area of material tested, under light uniform pressure. The air pressure is supplied by an inner cylinder of specific diameter and standardized weight, floating freely within an outer cylinder partly filled with oil to act as an air-seal. The sample material is held between clamping plates having a circular orifice area of 1.0 (standard), 0.25 or 0.1 square inch (optional).Densometer readings may be evaluated on both a direct or indirect basis dependent upon the material and test purpose. They are a direct test of materials which are intended to either resist or permit the passage of air. Indirectly, they are used to measure other physical properties which affect the flow of air through a porous sheet.
