•The secret to cool bodies and glazes is a lot of testing.
•The secret to know what to test is material and chemistry knowledge.
•The secret to learning from testing is documentation.
•The place to test, do the chemistry and document is an account at https://insight-live.com
•The place to get the knowledge is https://digitalfire.com

Sign-up at https://insight-live.com today.

Borate LOI - BLOI

This test procedure was employed in the Foresight Ceramic Database and now is available for those having an account at Insight-Live.com. Accumulating test data using the variables defined in these procedures enables us to create tools that enable you to compare the physical properties of materials and recipes.


The LOI on borate materials is difficult to measure because they have mechanical and crystal water and the temperature to heat samples to to remove only the former is difficult to assess.

Thus, the test is done this way:
-Take ten samples (from 10 bags) and mix well
-Weigh a bisque-fired bowl and dry and mark the weight on it
-Put powder straight from the bag into the bowl, weigh and mark
-Fire to cone 04
-Weight again and calculate the LOI



This calculates the LOI as follows:
Bowl - B
Bowl+Powder - BP
Bowl Fired - BF

(BP-B) - (BF-B) / (BP-B) * 100

DWT - Dry Weight (V)

This is the weight of the powder. The powder should be from a sample that has been collected from at least 10 bags throughout the shipment.

FWT - Fired Weight (V)

The weight of the powder fired to cone 010.

Out Bound Links

By Tony Hansen

Feedback, Suggestions

Your email address


Your Name


Copyright 2003, 2008, 2015 https://digitalfire.com, All Rights Reserved