Thermoplastic elastomers are a class of polymeric materials that have the elastic behaviour of rubber and the processability of thermoplastics. Rubber has been of strategic importance since the beginning of the automotive industry, and thermoplastic elastomers can function like rubber. In fact, below the melting temperature, TPE has an elastic behaviour like a thermoset rubber.
"TPEs are generally low modulus flexible materials that can be repeatedly stretched to at least twice their original length at room temperature, with the ability to return to their approximate original length when stress is released. They also have the ability to be reworked when heated above the melt transition temperature." (Xpolymers, "TPE Elastomers", n.d., https://www.xpolymers.it/tpe.html)
TPE is a rubber-like material obtained by mixing hard thermoplastics such as polypropylene (PP), polybutylene terephthalate (PBT), polyamide (PA) - or Nylon - with soft, rubbery materials. There are numerous approaches for the preparation of TPE, of which we will see the main ones:
The advantages of using this material mainly relate to recyclability and optimisation of conventional processing, which can range from injection moulding to extrusion, from thermoforming to blow moulding.
The classification of thermoplastic elastomers adheres to ISO 1043 using the abbreviation TPE with the addition of a letter indicating the chemical nature of that particular thermoplastic elastomer.
BLS uses thermoplastic rubber for the face seal of many reusable products that require high standards of respiratory protection and resistance to extreme environmental conditions. These characteristics allow BLS products to guarantee the end-user maximum comfort in the contact of the gasket with the face also thanks to the adaptability of the material to different types of faces.
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Which are the different types of facemasks and what are the differences? Alongside so-called surgical masks, there are also FFP1, FFP2 and FFP3 masks, with and without valves. What are the differences between these three types of protective facemasks?Surgical masks are medical devices that are used to protect ourselves and others. In fact, they block the propagation of droplets emitted orally when coughing and sneezing, or simply speaking. Nevertheless, they do not guarantee the blocking of the virus dispersed in aerosols as they are not leak-proof on the user’s face and do not have a filtering function during inhalation.
