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Adhesives for Ventilators – Special Properties for Life Saving Use

Posted on 4/9/2020 8:04:29 AM By ASC
  

Finding an explanation for why the world is fighting a deadly virus without enough ventilators to assist it in the struggle against a respiratory virus is not easy, but understanding the complex requirements of only one section of their assembly might make it at least a little clearer. Adhesives, for instance, need to have high and numerous credentials before they can be used in the assembly of medical equipment, especially so when that equipment is scheduled to help patients with respiratory problems, like those seriously affected by Covid-19.

According to medical adhesive manufacturer MasterBond, some of the most vital properties required include good strength, high speed processing and often a high degree of flexibility. But to be suitable, adhesives also have to get through stringent tests for biocompatibility and cytotoxicity, and in many instances are restricted from containing certain materials. They must also be suitable for use bonding the parts of equipment that is resistant to a wide range of temperatures, sterilants and chemicals and at the same time be able to bond with a wide array of substrates from acrylics, polycarbonates and polyesters, through metals, ceramics, plastics and some electronic components. 

Assembly of parts like filters, valves, cartridges, tubes, gaskets, sensors and face shields, all of which can become parts of Respiratory Device Assembly require certain adhesives.

These Medical Grade Adhesives Include:

  • UV curing systems that can be biocompatible per USP Class VI testing with medium viscosity, abrasion resistance, non-yellowing, thermal and electrical insulating qualities, serviceable from -80°F to +250°F, and resistant to exposure to radiation, Et0 and chemical sterilants.
  • Low viscosity epoxy adhesives, sealants, coatings and casting compounds that are USP Class VI approved and resist vibration, impact, shock, thermal cycling. They must be suited for bonding dissimilar substrates, serviceable from -80°F to +250°F, exposure resistant to EtO, radiation and chemical sterilants, and have excellent toughness.
  • Specially formulated one component systems must cure at room temperature, have a viscosity of less than 250 cps and be serviceable from -60°F to +200°F. Other requirements are that they must be suitable for both bonding and priming polyolefinic surfaces to promote adhesion of polyolefinic substrates to other surfaces such as metals and ceramics, and must pass ISO 10993-5 for medical devices.
  • Dual cure systems with UV and heat curing mechanisms which cure at 80°C in shadowed out areas must be Nano filled, and have high dimensional stability and abrasion resistance. They should also able to bond well to metals, glass, ceramics and most plastics, and be serviceable from -60°F to +350°F.
  • Single component silicone with a paste viscosity for bonding, sealing and coating medical devices should be non-corrosive and neutral cure. The compound must comply with USP Class VI and ISO 10993-5 specifications and resist many kinds of sterilization including gamma and other types of radiation, as well as EtO and some types of liquid sterilants.



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