1 Water vapor permeability test device for medical tape
2 Test procedure for water vapor permeability of medical tape
Put a plate containing about 1kg of anhydrous calcium chloride into an electric drying oven with circulating air facilities, and keep the temperature at 36°C~38°C. Take five small boxes that meet the above requirements, put about 2g absorbent cotton into each, pour about 20mL water into each, cover the top of the opening with the test strip of the test material, press the material, do not stretch the material when pressing, make the opening complete Was sealed. Ensure that the wet absorbent cotton does not contact the lower surface of the test material. The width of the material must be at least 5 mm greater than the opening size.
Weigh the sealed boxes to the nearest milligram, and put them in the cabinet for about 18 hours (the recording time is accurate to 15 minutes). Remove the box from the cabinet. Cool under standard atmospheric pressure for 1 h. Weigh again. Accurate to milligrams.
3 result presentation
Calculate the water vapor permeation per 24 h with the opening area and mass loss at the top of each box, expressed in grams per square meter (g?m-2). The water vapor penetration of medical tape every 24 h should be no less than 500 g?m-2.
A box made of anti-corrosion material, the external size is about 95 mm × 25 mm × 20 mm, the net mass does not exceed 60 g, except for the 80 mm × 10 mm rectangular opening on the top, the rest are all airtight, except for the opening (use The box is completely impermeable to water or water vapor except that the test material is covered.
2 Test procedure for water vapor permeability of medical tape
Put a plate containing about 1kg of anhydrous calcium chloride into an electric drying oven with circulating air facilities, and keep the temperature at 36°C~38°C. Take five small boxes that meet the above requirements, put about 2g absorbent cotton into each, pour about 20mL water into each, cover the top of the opening with the test strip of the test material, press the material, do not stretch the material when pressing, make the opening complete Was sealed. Ensure that the wet absorbent cotton does not contact the lower surface of the test material. The width of the material must be at least 5 mm greater than the opening size.
Weigh the sealed boxes to the nearest milligram, and put them in the cabinet for about 18 hours (the recording time is accurate to 15 minutes). Remove the box from the cabinet. Cool under standard atmospheric pressure for 1 h. Weigh again. Accurate to milligrams.
3 result presentation
Calculate the water vapor permeation per 24 h with the opening area and mass loss at the top of each box, expressed in grams per square meter (g?m-2). The water vapor penetration of medical tape every 24 h should be no less than 500 g?m-2.
