Chemical Composition

ZrO₂+HfO₂

%

≥65

≥64

≥63

SiO₂

%

≤34

≤35

≤36

Fe₂O₃

%

≤0.08

≤0.10

≤0.12

TiO₂

%

≤0.10

≤0.12

≤0.18

Al₂O₃

%

≤1.0

≤1.2

≤1.5

LOI

%

≤0.3

≤0.3

≤0.4

Physical Properties

Whiteness

-

90–94

86–90

80–86

Refractive Index

-

1.96–2.01

1.95–2.00

1.93–1.98

Specific Gravity

g/cm³

4.2–4.4

4.1–4.3

4.0–4.2

Mohs Hardness

-

7.5–8.0

7.5–8.0

7.5–8.0

Melting Point

℃

≥2550

≥2500

≥2450

Color

-

White / Slightly White

White / Light Beige

Light Beige / Slightly Yellowish

Thermal & Safety Indicators

Linear Expansion Coefficient (20–1000℃)

×10⁻⁶/℃

4.5–5.5

4.5–5.5

4.5–5.5

Specific Radioactivity

Bq/g

≤1.0

≤1.0

≤1.0

pH Value (Suspension)

-

6.5–8.0

6.5–8.0

6.5–8.0

Particle Size

Median Particle Size (D50)

μm

0.8–1.5

1.2–2.0

1.5–3.0

D90

μm

≤3.0

≤4.0

≤5.0

Specific Surface Area (BET)

m²/g

2–5

1.5–4

1–3

   Particle size can be customized as per customer requirements.