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Methods of Sand Testing: Name:Abdelrahman Amr Rabie I.D: 20150491 Group: 7

The document discusses various methods of testing sand that is used for molding in foundries. It describes three main types of sand tests: 1) moisture content testing to determine the appropriate amount of water, 2) clay content testing to measure the bonding material, and 3) grain fitness testing to evaluate size and shape. The moisture and clay content tests involve heating a sand sample to remove water or clay and calculating the percentage difference in weights. Sand testing helps control sand properties and ensure it meets requirements for mold performance.

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49 views4 pages

Methods of Sand Testing: Name:Abdelrahman Amr Rabie I.D: 20150491 Group: 7

The document discusses various methods of testing sand that is used for molding in foundries. It describes three main types of sand tests: 1) moisture content testing to determine the appropriate amount of water, 2) clay content testing to measure the bonding material, and 3) grain fitness testing to evaluate size and shape. The moisture and clay content tests involve heating a sand sample to remove water or clay and calculating the percentage difference in weights. Sand testing helps control sand properties and ensure it meets requirements for mold performance.

Uploaded by

Tesfu
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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H.T.

I
Methods of Sand testing

Name:Abdelrahman Amr Rabie


I.D: 20150491
GROUP: 7
Methods of Sand testing
The moulding sand after it is prepared should be properly tested to see that
require properties are achieved. Tests are conducted on a sample of the
standard sand. The moulding sand should be prepared exactly as it is done in
the shop on the standard equipment and then carefully enclosed in a
container to safeguard its moisture content.

Sand tests indicate the moulding sand performance and help the foundry men
in controlling the properties of moulding sands. Sand testing controls the
moulding sand properties through the control of its composition.

The following are the various types of sand control tests:

1. Moisture content test

2. Clay content test

3. Grain fitness test

Moisture content test:


Moisture is the property of the moulding sand it is defined as the amount of
water present in the moulding sand. Low moisture content in the moulding
sand does not develop strength properties. High moisture content decreases
permeability.
Procedures are:

1. 20 to 50 gms of prepared sand is placed in the pan and is heated by an


infrared heater bulb for 2 to 3 minutes.

2. The moisture in the moulding sand is thus evaporated.

3. Moulding sand is taken out of the pan and reweighed.

4. The percentage of moisture can be calculated from the difference in the


weights, of the original moist and the consequently dried sand samples.

Percentage of moisture content = (W1-W2)/(W1) %

W1-Weight of the sand before drying,

W2-Weight of the sand after drying.


Clay content test:
Clay influences strength, permeability and other moulding properties. It is
responsible for bonding sand particles together.

Procedures are:

1. Small quantity of prepared moulding sand was dried

2. Separate 50 gms of dry moulding sand and transfer wash bottle.

3. Add 475cc of distilled water + 25cc of a 3% NaOH.

4. Agitate this mixture about 10 minutes with the help of sand stirrer.

5. Fill the wash bottle with water up to the marker.

6. After the sand etc., has settled for about 10 minutes, Siphon out the water
from the wash bottle.

7. Dry the settled down sand.

8. The clay content can be determined from the difference in weights of the
initial and final sand samples.

Percentage of clay content = (W1-W2)/(W1) * 100

W1-Weight of the sand before drying,

W2-Weight of the sand after drying.

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