WAPI (Water Pasteurization Indicator)

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WAPI (Water Pasteurization Indicator)
A WAPI showing before (left) and after (right) position of the wax.
Description The WAPI uses soybean wax in a clear plastic tube that melts at the water or milt pasteurization temperature, indicating that disease causing organisms are killed.
Keywords Water pasteurization, soybean wax, water, milk, pasteurization, indicator, reusable, thermometer, temperature
Uses Indicating when pasteurization temperature is reached
Authors McArdle
Status Implemented
Made? Yes
Replicated? Was this project made independently by someone other than the authors and without their guidance? True
Published 2008/01/19
Materials Soybean wax
clear plastic tube
Sustainable Development Goals SDG06 Clean water and sanitation
SDG09 Industry innovation and infrastructure
SDG11 Sustainable cities and communities
Documentation data
Language English
Manifest data
Language English
Updated 2020-07-22
Author Megan Moore
Author affiliation Appropedia
Author email info@appropedia.org

The WAPI (Water Pasteurization Indicator) is a reusable, inexpensive thermometer employing a plug of soybean wax which melts at 68˚C, just above the 65˚C or 149˚F pasteurization temperature for water or milk, at which point all disease-causing organisms (bacteria, viruses, and parasites) are killed.

Since the water is not heated all the way to boiling, and merely reaches the pasteurization temperature, time is saved and less fuel is consumed.

Construction and use[edit | edit source]

The hydrogenated soybean oil called Myverol 18-06 K (a food-grade emulsifier powdered wax) is encased in a small clear plastic tube, weighted with a metal washer. Fishing line or wire suspends the WAPI toward the bottom of the water container (where the water is coolest). The WAPI is oriented with the wax plug at its top, but after melting the wax flows to the bottom part. Then the user can remove the WAPI by the string or wire without contaminating the clean water with the fingers.

External links[edit | edit source]