1. TRANSMISSION RATE TESTER.
WVTR AND OTR TEST
TRANSMISSION RATE TESTER.

2. Water vapour transmission rate (WVTR)
WVTR – time rate of water-vapour flow normal to two specified parallel surfaces under steady conditions, through unit area, under the conditions of the test
Accepted unit ( 1 gram per 24 h per sq. meter)

3. WVTR FOR PACKAGING CONTAINERS
The water vapour transmission rate (WVTR) through the container is determined by:
Container wall thickness
Permeability of the packaging material
Difference between the external and internal relative humidity environments
Driving force for the water flux through the container

4. TESTING
Specimens are attached to the top of the dishes by means of a sealant
Dishes contain desiccant / water depending on method
Complete assemblies are inserted in the atmosphere and after specific period of time are weighed accurately to determine gain or loss.
Test is conducted until nominal steady state exists

5. Permeation rate – (mL.mm)/(m2.24h.atm), dry, at (temperature 0o)
Transmission rate – (mL/(m2.24h), dry, at (temperature 0o)
Factors affecting permeation rate
Material thickness
Relative humidity
Temperature
Time
Barometric pressure
Test results should are valid only if the barrier material has reached equilibrium

6. W3/330 Water Vapor Transmission Rate Test System
W3/330 system is based on the electrolytic sensor method to measure water vapor transmission rate of film and package specimens. It has three independent testing cells and can be easily connected with 9 satellite systems.

7. Applications of Labthink moisture vapor transmission rate tester: -- Films  -- Sheeting  -- Paper and Paper Board  -- aluminium foils  -- plastic containers  -- Medical Packages  -- and other materials that used as a barrier material  Features of this moisture vapor transmission rate W3/330: -- Three testing chambers in one instrument with average value available  -- Electrolytic sensor method -- Precise and wide range temperature and humidity control  -- Conform to ASTM, ISO international standards  -- Referral films -- Professional software 

8. Technical Data: -- Test Range: 0. 1~1,000 g/m2·24h -- Resolution: 0
Technical Data:  -- Test Range: 0.1~1,000 g/m2·24h -- Resolution: g/m2·24h -- Temperature Range: 15°C~55°C -- Temperature Accuracy: ±0.1°C -- Humidity Range: 10%RH~98%RH -- Humidity Accuracy: ±1%RH Standards: ISO , GB/T 21529, DIN , YBB

9. Oxygen permeation rate (O2TR)
Oxygen- thief of flavor, texture, color, nutrition & shelf life
True shelf life condition tests – able to control RH% independently on each side of the material
Test - coulox sensor
The coulox oxygen sensor is a fuel cell that works in accordance with faraday’s law. When exposed to oxygen, the coulox sensor generates electrical current proportional to the amount of oxygen.

10. Pack
OVTR
(g. mm/(m2. day))
LDPE
241
HDPE
102
Polystyrene
127
Polycarbonate
114
Polypropylene 89
PVC 4
PET 2
Similar considerations are relevant to protection of products that are labile to oxidative degradation. The permeability of plastic containers to oxygen ingress has also been evaluated (OVTR), and is summarised here.

12. STANDARDS ASTM D-3985 Analysis Temp: 23C Test Gas: 100% O2 (dry)
Carrier Gas:
98%N2 / 2%H2 (dry)
Instrument:
MOCON Oxtran® 2/21
Methodology:

16. THANK YOU