Moisture vapor transmission rates

MethylceUulose reduces surface and interfacial tension. MethylceUulose forms high strength films and sheets that are clear, water-soluble, and oU-and grease-resistant, and have low oxygen and moisture vapor transmission rates (see Barrier polymers). 

Moisture vapor transmission rate (MVTR), for VDC copolymers, 25 709-710 Molality, 15 751 Molar absorptivity, 14 237 Molar flux, 15 678 Molar Gibbs energy, 24 660, 662 Molarity, 15 751... 

Following are the tests described in this Spec wet tensile strength, adhesion at low temp, moisture-vapor transmission rate, water-penetration rate corrosion, accelerated aging, dry tensile strength and tearing resistance... 

Fillers often have a significant effect on the moisture resistance, the moisture-vapor transmission rate, and the solvent and chemical resistance of the cured adhesive bond. The effect, however, can be in either direction. Some fillers such as calcium carbonate tend to lower acid resistance, whereas others, such as silica or aluminum, may tend to lower alkali resistance. 

Diaphragm having very low moisture vapor transmission rate, used over generator outlets to provide a hermetic seal. 

Commercialization of ODTs have to go through the final evaluation of long-term stability of the tablet matrix and packaging components per International Conference on Harmonisation guidelines. As the majority of ODT dosage forms on the market are sensitive to moisture, evaluation of moisture vapor transmission rate is an important parameter for assessing the shelf life of the product. 

Grade Vinyl acetate (%) Thickness (gm) Moisture vapor transmission rate (g/m /24h)... 

Melting point 75-102°C depending on polymer ratios. Moisture vapor transmission rate see Table I. Thickness see Table I. 

The ability of wax to prevent the transfer of moisture vapor is of primary concern in the food packaging industry. To maintain the freshness of dry foods, moisture must be kept out of the product, but to maintain the quahty of frozen foods and baked goods the moisture must be kept in the product. This results in two criteria for barrier properties moisture vapor transmission rates (A) at elevated temperatures and high relative humidity and (B) at low temperatures and low relative humidity, for frozen foods. 

Proper annealing conditions influencing paraffin wax distribution determine moisture vapor transmission rate. 

Moisture Vapor Transmission Rate, 37.8°C (g m day) 57.3 ASTM F372... 

Barrier effects Oxygen and moisture vapor transmission rates can be affected by some dartflers. 

Chem. Descrip. Vinylidene chloride acrylic copolymer emulsion Uses Vinylidene chloride-acrylic for maintenance primers, rust converting coatings, underbody/under hood coatings, barrier coatings Features Provides exceptionally low moisture vapor transmission rate, exceptional corrosion and humidity resist., exc. adhesion Properties Emulsion dens, 9.7 Ib/gal vise. 30 cps pH 1.5 hardness (Konig) 30 57.5% NV by wt. 

IR Isoprene rubber (synthetic), polylsoprene MVTR moisture vapor transmission rate... 

Polyurethanes based on the incorporation of a polyethylene oxide soft segment exhibit substantial water uptake and, related high moisture vapor transmission rates (MVT). The variable and controlled degree of swelling with the related water and solute permeability could be useful in certain biomedical applications, including controlled release of medications from the water swollen polymer. In earlier work Tobolsky and coworkers (7) described the... 

Compositions have been developed that include a biodegradable aliphatic-aromatic copolyester, i.e., poly(tetramethylene adi-pate-co-terephthalate) and a plasticizer. The composition exhibits a moisture vapor transmission rate of at least 400 (1). 

Moisture vapour transmission rate From Wikipedia, the free encyclopedia. http //en.wikipedia.org/wiki/Moisture vapor transmission rate. Accessed on 20 October 2012. 

Moisture adsorption Moisture vapor transmission rate (MVTR)... 

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