How much humidity can pva capsule sustain?
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Polyvinyl alcohol (PVA) capsules are known for their sensitivity to moisture and humidity. The exact amount of humidity that a PVA capsule can sustain without deteriorating or dissolving depends on several factors, including the specific formulation of the PVA, the thickness of the capsule wall, and the environmental conditions.
In general, PVA is soluble in water and will start to dissolve or swell in high humidity environments. This is because PVA is a hydrophilic (water-attracting) polymer. The rate of dissolution or degradation will increase as the relative humidity rises, especially above 80% relative humidity. However, some formulations of PVA may have additives or cross-linking that make them more resistant to moisture.
For applications where moisture resistance is critical, it's important to choose a PVA formulation that is designed for that purpose or to store the capsules in a controlled environment where humidity levels are kept low. Manufacturers of PVA capsules or products can provide more specific information based on their proprietary formulations and recommended storage conditions.