Wapi-before-after.jpg
Project data
Authors McArdle
Status Implemented
Completed 2008
Made? Yes
Replicated? TRUE
Instance of Pasteurization
Export to Open Know How Manifest
Page data
Type Project
Keywords Water pasteurization, soybean wax, water, milk, pasteurization, indicator, reusable, thermometer, temperature, Soybean wax, clear plastic tube, string, wire
SDGs Sustainable Development Goals SDG06 Clean water and sanitation
SDG09 Industry innovation and infrastructure
SDG11 Sustainable cities and communities
Published by David Brown
Megan Moore
McArdle
Published 2008
License CC BY-SA 3.0
Language English (en)
Page views 3,628

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]