Water vapour transmission rate

Laminated tapes In more general use now than pressure sensitive tapes are tapes consisting of polyvinyl chloride or polyethylene films in conjunction with butyl rubber. These tapes are applied with an adhesive butyl rubber primer. Thicknesses of up to 0-75 mm are in use and loose protective outer wraps of p.v.c. or polyethylene sheet are commonly applied. Tape quality control is exercised with reference to ASTM standard test methods and may include water vapour transmission rate and elongation. [Pg.666]

ISO 2528, Sheet materials - Determination of water vapour transmission rate -Gravimetric (dish) method, 1995. [Pg.94]

ISO 15106-1 2003 Plastics - Film and sheeting - Determination of water vapour transmission rate - Part 1 Humidity detection sensor method ISO 15106-2 2003 Plastics - Film and sheeting - Determination of water vapour transmission rate - Part 2 Infrared detection sensor method ISO 15106-3 2003 Plastics - Film and sheeting - Determination of water vapour transmission rate - Part 3 Electrolytic detection sensor method... [Pg.178]

For flexible film applications such as carrier and trash bags PLA has the potential to replace LDPE and HDPE bags when a compostable solution is desired. Furthermore, the high water vapour transmission rate of PLA is beneficial for fresh food applications where it is important that the water vapour escapes quickly from the packaging. PLA also reduces fogging on the lid of the packaging. [Pg.72]

ISO 1663-81 Cellular Plastics — Determination of Water Vapour Transmission Rate of Rigid Materials, 4 pp... [Pg.448]

ISO 2528. 1974. Sheet Materials—Determination of Water Vapour Transmission Rate—Dish Method. [Pg.174]

ISO R1195. 1970. Determination of the Water Vapour Transmission Rate of Plastics Film and Thin Sheets. [Pg.174]

Polymer Film thickness (mm) Oxygen transmission rate (cm m day ) Water vapour transmission rate (gm day )... [Pg.453]

The oxygen transmission rates are high since these low crystallinity polymers are above Tg. The water vapour transmission rates are lowest for the metallocene PE of density 905 kg m. BS EN ISO 3826-1 2003 requires the water loss, when a full bag is stored for 42 days at 4 2 °C at 55% relative humidity, must be less than 2%. [Pg.454]

The permeability of the geomembrane samples was calculated using an equation shown below. WVTR(Water Vapour Transmission Rate) measurements were conducted following a procedure detailed in ASTM E 96. [Pg.413]

The permeability measured by water vapour transmission rate is given in Table 4. It is seen that HOPE showed a superiority among other materials, PVC geomembrane was the worst in permeability among the samples tested. Bitumen contents adversely affect the permeability of ECB. [Pg.417]

Queen, D., Gaylor, J.D.S., Evans, J.H., Courtney, J.M., Reid, W.H. The precltntcal evaluation of the water vapour transmission rate through birm woimd dressings. Biomaterials 8, 367-371 (1987)... [Pg.251]

Notes 300 nm, 23 °C water vapour transmission rate at 25 °C P(HB-HV) (94/6) " tensile strength oriented fibre nonoriented film Young s modulus elongation at break. [Pg.183]

WVT = water vapour transmission rate, g/m /day G = weight change, g... [Pg.46]

ASTM Standard F 1249-90 (1995) Standard Test Method for Water Vapour Transmission Rate Through Plastic Film and Sheeting Using a Modulated Infrared Sensor. [Pg.209]

Food packaging is another remarkable application of carbon nanotube composites. Usually, poor mechanical and barrier properties have limited the application of biopolymers hence, an appropriate filler is necessary for promoting the matrix properties. The unique properties of CNT have improved the thermal stability, strength and modulus, as well as the water vapour transmission rate of the industrially applied composites. [Pg.33]

The barrier properties of starch nanocrystals/natural rubber nanocomposites were also investigated [39]. For these systems, the water vapour transmission rate, the diffusion coefficient of oxygen, the permeability coefficient of oxygen and its solubility, were measured. It was observed that the permeabiUty to water vapour, as well as to oxygen, decreased when starch nanocrystals wctc added These effects were ascribed to the platelet-like morphology of the nanocrystals. [Pg.416]

Water vapour permeability can be measured to determine the effectiveness of a film coating to act as a barrier to water. Several variables have been shown to influence water vapour permeability, and considerable variations can be observed when modifying the film composition, film thickness and film preparation technique. By using different experimental setups, it is possible to measure the water vapour transmission rate (WVTR, generally expressed in g/m /day) of... [Pg.127]

Table 14.3 Water vapour transmission rate (WVTR), diffusion coefficient (D), permeability coefficient (P) and solubility (S) of oxygen for starch nanocrystal/NR nanocomposite films.

Swelling or sorption test of liquids and vapours through the rubber is obtained by the standard method of ASTM D 814 and ISO 6179 2010 as a general method for various types of rubber. Other standard methods to test liquid and water vapour transmission rate are displayed in Table 27.1. Gas permeation test is obtained by the standard method of ASTM D 1434-82 and ISO 2782 as a general method, especially for oxygen gas mostly using ASTM D 3985 as a protocol for measurement. Table 27.2 exhibits the standard methods of gas permeability test. [Pg.803]

Sheet materials - Determination of water vapour transmission rate - Gravimetric (dish) method Rubber, vulcanized or thermoplastic Rubber sheets and rubber coated fabrics - Determination of transmission rate of volatile liquids (gravimetric technique)... [Pg.804]

Physical testing of rubber, Method for determination of the transmission rate of volatile liquids Plastics. Determination of water absorption Determination of the water vapour transmission rate of plastic film, rubber sheeting, paper, board and other sheet materials by gravimetry... [Pg.804]

The water-vapour transmission rate (WVTR) through the sealant may be measured using apparatus as shown in Fig. 2. Because of differences in details, such as film thickness and... [Pg.450]

Fig. 2. Detemiination of moisture vapour transmission. The apparatus is stored at constant temperature and humidity. Weight loss is taken as a measure of water vapour transmission rate...

Typical water-vapour transmission rates for the various classes of breathable fabrics used are shown in Table 13.17. [Pg.400]

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