Moisture barrier, immediate release
Polyvinyl alcohol
Also written as PVA.
What it is
PVA films are less permeable to water vapour than HPMC at the same thickness, which is what makes a moisture barrier a barrier. Our moisture barrier grades are fully formulated HPMC and PVA based immediate release systems, so the protection does not come at the cost of release.
What it does in the film
PVA films are less permeable to water vapour than HPMC at the same thickness. That single property is what turns a cosmetic coat into a barrier, and it is why a moisture barrier grade is judged on stability data rather than on gloss.
When to choose it
Where the product passes release but drifts on stability. Multivitamins, ferrous salts and the Amoxycillin with Clavulanate combination are the recurring cases in our range.
How it runs on the coater
Film coating band. The barrier protects the tablet inside the pack rather than repairing moisture already absorbed, so plan the stage so coated tablets reach blistering without a long open hold.
- Role
- Moisture barrier, immediate release
- Also called
- PVA
- Grades on this base
- 4
Grades built on polyvinyl alcohol
- CVS-101Moisture barrier for Amoxycillin and ClavulanateSolvent base extra white barrier film for the most moisture sensitive combination.Moisture barrier
- PA-Wt10Extra white film coat for plain AmoxycillinSolvent base extra white film for plain Amoxycillin and dissolution critical tablets.Moisture barrier
- MB 31RPMoisture barrier for multivitamin and ferrous tabletsSolvent base barrier film for hygroscopic multivitamin and iron formulations.Moisture barrier
- AC-8Moisture barrier for special category tabletsSolvent base barrier film for products outside the standard range.Moisture barrier
The other polymers
- Enteric, delayed releaseMethacrylic acid copolymermethacrylic base, acrylic enteric polymer
- Enteric, delayed releaseCellulose acetate phthalateCAP, CAP base
- Enteric, delayed releasePhthalate base polymerHPMC phthalate, phthalate enteric polymer
- Immediate release film, seal, sugar filmHypromelloseHPMC, hydroxypropyl methylcellulose
Films built on this polymer
Metallic gold film coat
Metallic blue DB3012
Aqueous colour film coat
Extra white film coat