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We Provide a Full Range of Products

CR Minerals pumice products are 100% natural materials. No synthetic chemicals or other materials are added during mining or processing. The superior properties of CR Minerals pumice products result from both our unique high purity, low-density pumice deposit and our exacting process procedures.

PFM

PFM

(Pumice Filtration Media)®

Introducing Tephra®

Tephra Logo

CR Minerals offers several grades of Tephra® to serve the construction and oil and gas industries as a natural pozzolan. Tephra® has been tested, proven, and certified as a natural pozzolan in accordance with ASTM C618N. CR Minerals’ pozzolans are among the most effective products available to protect concrete from the deleterious effects of chemical attack and will also enhance compressive strengths.

We are pleased to announce our new plant that will be located in Pueblo, CO.

Technical Data

Typical Chemical Analysis

Weight %

Silicon Dioxide

SiO2

75

Aluminum Oxide

Al2O3

12

Potassium Oxide

K2O

4

Sodium Oxide

Na2O

4

Calcium Oxide

CaO

<2

Magnesium Oxide

MgO

<2

Titanium Oxide

TiO2

<2

Ferrous Oxide

Fe2O3

<2

Physical Properties - Navajo Brand®

Specific Gravity

2.4

Weight per Solid Gallon, Lbs.

20.0

Bulking Volume, Gal/Lb.

0.5

Hardness (Mohs Scale)

6.0

pH (10% in Water)

9.0

Refractive Index

1.5

Refectance (Green Filter)

80

Moisture Content

<1%

Reactivity

Inert

Color

Off-White

Typical Physical Properties - SafSil®

CT 200

CT 450

CT 550

CT 600

Median Particle Size (Microns)

12

7

5

3

Hegman Grind

2

4.5

5.5

6

Oil Absorption (ASTM D281)

25

26

28

29

GE Brightness

77

78

80

81

Specific Gravity

2.34

2.34

2.34

2.34

Weight / Gallon

19.5

19.5

19.5

19.5

Hardness, Mohs Scale

5.5 - 6.0

5.5 - 6.0

5.5 - 6.0

5.5 - 6.0

Refractive Index

1.5

1.5

1.5

1.5

pH (10% in Water)

9

9

9

9

Moisture Content

<1%

<1%

<1%

<1%

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