The ISO 2781 standard, developed by the International Organization for Standardization (ISO), defines two test methods for determining the density of solid vulcanized and thermoplastic rubbers. The test results are considered important for controlling the quality of a rubber compound and for calculating the mass of rubber required to produce a given volume of material.
The test methods described in the ISO 2781 standard do not include determining the relative density of rubber, which is the ratio of the mass of a certain volume of rubber to the mass of an equal volume of pure water at a certain temperature.
For the purposes of this standard, the concept of density refers to the mass per unit volume of rubber at the specified temperature. This value is expressed as megagrams per cubic meter (Mg/m3).
Thermoplastic rubber is a relatively new class of polymer. It has the solubility and thermoplasticity of polystyrene, as well as the flexibility of vulcanized natural rubber at ambient temperatures. These materials are often combined with plasticizers to reduce hardness, eliminate shrinkage, improve pressure sensitive adhesion, improve low temperature flexibility, reduce solution viscosity, reduce cohesive strength, or increase plasticity if desired. Low levels of thermoplastic rubbers are sometimes added to other rubber adhesives.
Rubbers are most commonly used in the form of vulcanized rubber. They are brought into this form by the vulcanization process. Rubbers (elastomers) are polymer materials that are characterized by their ability to reversibly deform under the influence of external deformation forces. The extent of the deformation depends on the structure and molecular weight of the deformed rubber, as well as on the external conditions of the deformation.
Rubber density depends on the type of rubber used for a product. Which rubber density is suitable in production depends on the conditions in which it is used. Rubber is used in different industries today. For example, industrial manufacturing, consumer products, aerospace and defense, medical devices and products, pharmaceuticals and supplier materials. Densities of commonly used rubbers are as follows: natural rubber 0,92 g/cm3, styrene butadiene rubber 0.92 g/cm3, butadiene rubber 0.92 g/cm3, nitrile butadiene rubber 0,93 g/cm3 and fluoroelastomers 1,90 g/cm3 .
Among the numerous tests, measurements, analyses, and evaluations our organization provides for businesses in various sectors, we also offer density determination testing services for rubber, vulcanized, or thermoplastic products under the ISO 2781 standard, utilizing a trained and expert staff and advanced technological equipment.
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