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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With a filtering capacity of more than 94% for FFP2 and more than 99% for FFP3, the new BLS 502 and BLS 503 masks are DPI without valves, CE certified according to European regulation 2016/425 and technical standard EN 149: 2001, able to protect users in the event of exposure to solid and/or liquid non-volatile particles (dust, fumes, mists) and to block the dispersion of viruses both incoming and outgoing. They are, in fact, sealed on the face and manufactured with a "welding” process, without seams and perforations on the fabric from which micro particles could pass, thus creating a barrier during exhaling, protecting the environment from the user of the mask. These masks are therefore ideal for use in the food & beverage and medical sectors, as well as in all work environments where contamination by the user must be avoided.
