Wonder Keep, Wonder Sensor, Wonder Sensor and Wonder Keep
WonderKeep®, an Oxygen Absorber
WonderKeep® is used widely for keeping food fresh and preventing discoloration, keeping insects away from stored clothing, etc., and stopping metal products from rusting by extracting the oxygen from the interior of a sealed package, reducing the oxygen content to close to zero (0.1% or less).
| Type/Special Features | Type | O2 Extraction Approx. Time (25℃) |
Exposure time | Aw | Applications | ||
|---|---|---|---|---|---|---|---|
| Ferrous | Self-reacting type Reaction starts when exposed to oxygen in the food package |
Standard type for low-moisture products |
Oxygen absorbed=(15cc～2000cc) 
|
24-72 hours | Within 4 hours | 0.30～0.85 | Dry foods, nuts, cookies, rusk, grains, etc. |
| Water- and oil-resistant, fast and effective for frozen food |
Oxygen absorbed=(20cc～500cc) 
|
12–48 hours (48–168 hours at lower temp.) |
Within 2 hours | 0.50～0.92 | Fruitcake, dried meat | ||
| Fast and effective for items that mold or deteriorate rapidly |
Oxygen absorbed=(100cc～200cc) 
|
12–36 hours or more (48–120 hours at lower temp.) | Within 1 hour | 0.60～0.90 | Fresh bread, pastries, cakes with high moisture, etc. | ||
| Moisture-activated type Reaction starts when exposed to oxygen in the food package |
For use with high-moisture products and high-moisture products that contain oil |
Oxygen absorbed=(20cc～300cc) 
|
12–48 hours | Within 8 hours | 0.85 < Aw | Fresh pasta, cheese, pizza, flour, products containing high amounts of fresh cream and butter, for use in boxed meals | |
| For use with oil and very high moisture products |
Oxygen absorbed=(25cc) 
|
12–48 hours | Within 8 hours | 0.85 < Aw | Small, individually wrapped items | ||
WonderSensor®, an Oxygen Sensor
WonderSensor® is used to indicate if oxygen is present in the ambient air inside the food package.
With WonderKeep® and WonderSensor® in the same container, it is possible to detect the presence of oxygen in the container by a change of color.
The color will be blue for oxygenic conditions (oxygen above 0.5%) and pink for anoxic conditions (oxygen below 0.1%).
How to Use WonderSensor®
Use WonderSensor® to check for a defective package: Place WonderSensor® and WonderKeep® together inside the package to check that there are no pinholes or if the package has sufficient barrier performance against oxygen permeation.
| Type/Special Features | Type | Color changes at 25 °C | Exposure time | Aw | Applications | |
|---|---|---|---|---|---|---|
| With holes | Regular type |
|
Turns blue in 5–10 minutes and pink in 2–5 hours in less than 0.1% oxygen | Within 4 hours | 0.60～0.90 | Dried fruit |
| No holes | Water/oil resistant type |
|
Turns blue in 20–30 minutes and pink in 2–5 hours in less than 0.1% oxygen | Within 4 hours | Aw > 0.20 | Pasta, peanuts |
SensorKeep
The benefits of WonderSensor® and WonderKeep® in one convenient package; eliminates an extra processing step and simplifies checks during shipping.
| Type/Special Features | Type | O2 Extraction Approx. Time (25℃) |
Exposure time | Aw | Applications | |
|---|---|---|---|---|---|---|
| Self-reacting type Reaction starts when exposed to oxygen in the food package |
Standard type (Sensor on one side) |
CLP Oxygen absorbed=(20cc～500cc) 
|
24–72 hours | Within 2 hours | 0.60～0.90 | Salami, sausages, etc. |
| Water/oil resistant type (Sensor on one side) |
ALP Oxygen absorbed=(20cc～500cc) 
|
24–72 hours | Within 2 hours | 0.50～0.92 | Pound cake, financier | |
| Moisture-activated type Reaction starts when exposed to oxygen in the food package |
For use with high-moisture products and high-moisture products that contain oil (Sensor on one side) |
AXW Oxygen absorbed=(20cc～300cc) 
|
24–72 hours | Within 4 hours | 0.85 < Aw | Fresh pasta, cheese, pizza, flour, products containing high amounts of fresh cream and butter, for use in boxed meals |