Moisture vapor permeability

Once applied, the eure rate will depend heavily on the moisture eontent and/or moisture vapor permeability of the substrates between whieh the adhesive is sandwiehed. For wood substrates, typieally full eure oecurs in a day with the faster systems. Misting of the substrates with water is sometimes conducted prior to adhesive applieation to further speed eure, or when the substrates are substantially moisture impermeable. 

Moisture vapor permeability, for 1 mm thickness, g/(24 h) (m2) Radiation resistance ( CO), MGye-f... 

Container Classification If the moisture vapor permeability of not more than.... .. of the.... .. test containers exceeds.... ..and none exceeds... 

Figure 1.1 Moisture vapor permeability rate vs thickness through fluorinated ethylene propylene copolymer.

Figure ii.02 Moisture vapor permeability rate vs temperature through polyvinylidene fluoride. 

Good breathability and moisture vapor permeability for vegetables, fruits, and bread... 

Table 5 Gas and moisture vapor permeability of PLA and other plastics...

Moisture vapor permeability See specific permeability (of a film to moisture). 

Wang X, Luo X, Wang X. Study on blends of thermoplastic polyurethane and aliphatic polyester morphology, rheology, and properties as moisture vapor permeable films. Polym Test 2005 24(1) 18-24. 

Moisture Vapor Permeability See Specific Permeability (of a Film to Moisture). 

Figure 111.09 Moisture vapor permeability rate vs. thickness through ethylene chlorotrifluoroethylene copolymer.

Although the process used in casting films, described earlier, did not produce films of reproducible and exact thickness, the values obtained (Table 1) seemed to be adequate in meeting the requirements. The moisture vapor permeability, bacterial barrier and degradation studies, directly affected by the thickness, should provide a more effective design criteria for the size of the films. 

As stated before, a dressing should have pores large enough to allow the exudate vapor through, but small enough to prevent bacterial penetration. There are acceptable rates for moisture vapor permeability (MVP). 

Table 2. Comparison of moisture Vapor Permeabilities of Commercial Dressings and Materials of Proposed Dressiiu ...

Watkins, D. A. Slater, K. The Moisture Vapor Permeability of Textile Fabrics, J. Textile Inst. 1981, 72,11-18. 

Wang, X., X. Luo, and X. Wang, Study on Blends of Thermoplastic Polyurethane and Aliphatic Polyester Morphology, Rheology, and Properties as Moisture Vapor Permeable Films, Polymer Testing, 24(1), 18-24, 2005. 

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