•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.

Oil Adsorption (Spatula) - OLAD

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.

Notes

The oil adsorption of a powders (usually pigments) is defined as the number of grams of linseed oil absorbed by 100 gms of the powder. Thus this test is a measure of the ability of a powder to hold onto oil.

APPARATUS AND REAGENTS :
1. Glass weighing bottle 50 ml.
2. Glass tube
3. Marble Slab or ground glass plate
4. Sharp edged steel spatula
5. Accurate scale
6. Clear raw linseed oil

Procedure:

1. Weigh 15 grams of the test sample (adjust to 25 grams for low absorption materials, to 5 grams or less for high adsorption materials).

2. Fill the weighing bottle with raw linseed oil and insert the glass tube in it and weigh the bottle.

3. Place the weighed test sample on the glass plate or the marble slab.

4. Add the linseed oil from the bottle drop by drop (using the glass tube) and after each addition thoroughly mix the oil and the pigment by rubbing with the spatula.

5. Continue the addition of the oil till exactly enough oil has been incorporated to produce a very stiff paste that does not break or separate. Spread the paste on the marble slab and with the spatula gently roll the paste. It should roll without separation.

6. Reweigh the bottle with linseed oil and the glass tube.

7. Repeat the test and average the result.

Calculation:
A = Wt. or the test sample.
B = Initial wt. of the bottle with linseed oil.
C = Wt. of the bottle with linseed oil after the test.

Oil Adsorption = ((B-C) x 100) / A

Variables

VAL - Value (V)

Out Bound Links


By Tony Hansen




Feedback, Suggestions

Your email address

Subject

Your Name

Message


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