Material for Vacuum formed blister

[StG10]

thread108-216193

Hi , we are producing blister for medical device by means of vacuum forming. The materials are PETG or GAG . The problem -the product doesn't withstand moisture test ,caused by high glycol level in PETG/GAG and we are looking for alternative material ,that is suitable for vacuum forming process
It should be translucent ,moisture resistant , and has Dielectric Strength.
Could ,please ,advise any from PET type or probably PMMA ?

Thanks,

 

[btrueblood]

"the product doesn't withstand moisture test" - what do you mean, does the bag pass too much water during humidity testing, or does the plastic bubble fail in some other way?

If you need less moisture permeability, you should look at PVDC films, they should be quite a bit less permeable than PET films. Layering films with aluminum helps as well, and more layers helps more - of course, aluminized films are less translucent or not at all.

 

[StG10]

It means the bag pass too much water during humidity testing. Can you please advise any brand of PVDC that that besides of less moisture permeability has dielectric strength and translucent appearance?

 

[Compositepro]

https://www.healthcarepackaging.com...13282896/selecting-film-for-blister-packaging

Moisture vapor transmission rates (MVTR)

Many drugs can degrade and lose their efficacy through hydrolysis, or otherwise stated by reacting with water. In a large number of situations, the moisture diffuses from the outside environment through the film and into the product. A package engineer can select a different type of film to create different levels of barrier to guard against water diffusion. Monolayer films, such as those manufactured from PVC, polyester, and polypropylene, offer a basic level of moisture vapor protection. In moisture-sensitive applications, successfully protecting the drug requires some type of multiple-layer structure barrier film. The pharmaceutical industry typically relies on multiple-layer structures made with PVdC coatings or laminations made with Aclar® films.

Coated and laminated films will typically utilize a base film layer of PVC or polyester. The PVC and polyester films allow for successful processing on common Form/fill/seal equipment while the PVdC and Aclar® portions provide the barrier to diffusion. The pharmaceutical industry commonly packages product with several types of barrier films offering varying levels of barrier for use in stability studies in order to determine the effectiveness of the package to prevent hydrolysis from occurring.

 

[StG10]

Thanks for the information and link . I haven't found information whether PVDC can be used in Plastic Vacuum Forming. can you advise ?

 

[MacGyverS2000]

This should be moved to one of the plastics forums... RFing for move...

Dan - Owner

http://www.Hi-TecDesigns.com

 

[MacGyverS2000]

Reposted in Plastics Engineering forum... any further responses should be made there.

Dan - Owner

http://www.Hi-TecDesigns.com

 

[btrueblood]

Whatever. It's a pain in the ass that the prior replies were not moved too.