C.E.D. PROCESS MINERALS, INC.

CRISTOBALITE

The Functional Filler of Choice

C.E.D. Process Minerals Technology ReviewJanuary, 2013

C.E.D. PROCESS MINERALS, Inc.

A HIGH TEMPERATURE POLYMORPH OF SILICA. OCCURS RARELY IN NATURE. MANUFACTURES THROUGH A PROPRIATARY, SOLID

STATE HIGH TEMPERATURE PROCESS TO CREATE A USEABLE FORM.

CED CRISTOLBRITE AND GORESIL CRISTOBALITE POSSESS A COMBINATION OF PROPERTIES AND CHARACTERISTICS UNIQUELY SUITED FOR APPLICATION AS FUNCTIONAL FILLERS IN ELASTOMERS.

CRISTOBALITE

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C-1 Cristobalite – processed to contain a minimum of 96% cristobalite. The remainder can be tridymite, quartz or amorphous silica. Product is milled to sizes from 30 mesh to 400 mesh

GoreSil – manufactured from C-1 cristobalite. Processed to micron sizes and classified to control particle size distribution. Available in sizes from 10µm to 2µm.

CristolBrite – Engineered chemistry to provide high brightness and whiteness. Higher pH than C1, C-2 and GoreSil.

C-2 cristobalite – processed to contain 75% cristobalite. The remainder can be quartz and tridymite. Same chemical composition as C-1 but lower cristobalite content.

C-65 cristobalite – engineered to have 65% cristobalite with the majority of the additional phase as quartz. Designed for abrasive application. 

CED Cristobalite Grades

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The Brightest Idea in Functional Fillers

Very high solar reflectance and thermal emittance Extremely bright and white Jointed surface texture Enhances mechanical bonding with organic

polymers Hydrophobic Low Moisture Content Low Oil Absorption High hardness High purity silicate mineral Available in particle sizes from 0.7mm to 2µm

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Solar Reflectance and Thermal Emittance

Vital to the performance and effectiveness of cool roof products is solar reflectance and thermal transport characteristics combined to minimize heat gain.

CED CristolBrite & GoreSil

Solar Reflectance = 0.93Thermal Emittance = 0.88

Solar Reflectance Index =119

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Extremely Bright and White

The high temperature transformation of quartz to the silica polymorph, cristobalite, is accompanied by a significant increase in whiteness and brightness. The index of refraction changes from quartz(1.55) to cristobalite(1.48). CED CristolBrite and GoreSil is further modified to optimize brightness.

Hunter Brightness: L* = 96 a = 0.1 b = 0.5

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Jointed Surface Texture

CristolBrite 500x Quartz 500x

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The contrast in surface texture between cristobalite and quartz is illustrated in the pictures on the previous page. Cristobalite has a rounded morphology while quartz fractures exposing acute angles

and flat faces.

Cristobalite has a low index of refraction and no color tint. Those attributes, coupled with the jointed surface texture –

Cristobalite is an excellent titanium dioxide extender

Jointed Surface Texture

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Hydrophobic and Hydrophilic are frequently used descriptors of surfaces. A surface is hydrophobic if it tends not to absorb water or be wetted by water. A surface is hydrophilic if it tends to absorb water or is wetted by water. More particularly, the terms describe the interaction of the boundary layer with liquid or vapor water.

The surface of most mineral fillers terminate with metal hydroxyl groups and are usually hydrophilic. These surfaces tend to attract moisture and are less compatible with organic polymers.

The surface of CristolBrite and GoreSil terminate with siloxane groups. These surfaces are hydrophobic. The siloxane layer promotes adhesion and increase in mechanical properties in organic polymer systems.

Particle Surface

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The graph presents the effect of various loading levels of GoreSil on the resistance to scratch in a 100% solids UV polyurethane.

Even loading levels as low as 4% have demonstrated significant improvement in scratch resistance

Particle Surface

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Physical Properties Chemical analysis, Wt%

Specific Gravity 2.33 SiO₂ 99.7

Hardness (Mohs) 6.5 Al₂O₃ 0.09

Refractive Index 1.48 Fe₂O₃ 0.04

pH CaO 0.02

CristolBrite 8.5 TiO₂ 0.01

GoreSil 6.5

Physical and Chemical

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Particle Size Distribution, µm

CristolBrite    

GoreSil    

             

  KRS 100 200 325 1260 845 1045 835 525 215 210

BET Surface Area            

m²/gm 0.3 0.9 1.7 2.2 1.4 1.9 3.3 3.7 5.4 7.5 9.0

             

d95 500 100 80 50 35 25 18 17 10 7.6 6.2

             

d50 350 30 18 12 12 7 7.5 6.5 4 3.2 2.4

             

d10 150 3.4 2.3 1.5 1.5 1.0 2.0 2.0 1.5 1.3 1.0

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Relatively high Solar Reflectance Index

Hydrophobic

Improves resistance to scratching and dirt build up

Non reactive to acids and bases

Weathering Resistance

Thermal Expansion of Silica

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Thermal Expansion of Cristobalite

0 200 400 600 800 1000 12000.00

0.20

0.40

0.60

0.80

1.00

1.20

1.40

1.60

1.80

Temperture, ᵒC

Th

erm

al

Exp

an

sio

n,

%

Particle Size Analysis