Bentonite - HPM-20 (priced per lb.) [SHIPS CA]

Note: Sold in 5 lb. increments; Sold in 50 lb. increments for orders 50 lbs. or more.

Al₂O₃.4SiO₂.H₂O

Priced by the pound. A very fine-grained plastic clay of volcanic origin containing colloidal matter. Used in small amounts as an additive to clays to aid in plasticity and in glazes as a suspending and binding agent.

(Air Purified) Ultra-fine ground, air-purified Bentonite recommended when a finer grade than 325 is needed for glaze applications.

Typical analysis:
SiO2	58-64%
Al2O3	19-22%
CaO	0.65%
MgO	2.5-3.2%
Fe2O3	2.8-3.5%
FeO	0.2-0.4%
Na2O	1.5-2.7%
K2O	0.2-0.4%
TiO2	0.1-0.2%
Moisture	6-12%
PH	9.0-10.5

Melting point approx. 2192°F

Bentonite can be added to most glazes in amounts up to 1%. Excessive amounts can cause a glaze to become gel like. When used as a plasticizer in clay body, 1-3% is generally used. Bentonite can cause warping and cracking in clays if used in large amounts.

Bentonite should always be added to dry compositions, never to wet. Magnesium bentonites tend to swell, holding large amounts of water. Calcium bentonites are of the non-swelling variety.

*Note: Ships from our California or Ohio locations.

**Note: For large or heavy orders that weigh 150 lbs. we will advise you of the approximate freight cost. You will not be charged until we verify shipping costs with you.**

View SDS Sheet