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Typical Physical Property Comparison of Alumina Trihydrate (ATH) and Magnesium Hydroxide (MDH)
| Property |
ATH |
MDH |
| Physical Form |
Powder |
Powder |
| Particle morphology |
Hexagonal platelet |
Hexagonal platelet |
| Color |
White |
White |
| Specific gravity g/cm3 |
2.42 |
2.36 |
| pH value |
9 - 10 |
10 - 11 |
| Mohs hardness |
2.5 - 3.5 |
2.0 - 3.0 |
| Refractive index |
1.57 |
1.58 |
| Decomposition temperature |
220oC / 428oF |
330oC / 626oF |
| Heat of decomposition, cal/g |
280 |
328 |
| Theoretical loss of ignition |
34.6% |
31.0% |
Typical Kemgard® Physical Properties
| Kemgard® Grade: |
911A |
911B |
911C |
981 |
425 |
501 |
MZM |
HPSS |
| Composition |
Calcium Molybdate Zinc Complex |
Zinc Molybdate Compound |
Zinc Molybdate / Magnesium Silicate Complex |
Basic Zinc Phosphate Complex |
Calcium Molydbate Zinc Complex |
Calcium Molybdate Complex |
Zinc Molybdate / Magnesium Hydroxide Complex |
Basic Zinc Molybdate / Magnesium Hydroxide Complex |
| Appearance |
White Powder |
White Powder |
White Powder |
White Powder |
White Powder |
White Powder |
White Powder |
White Powder |
| Specific Gravity |
3 |
5.1 |
2.8 |
4.2 |
3 |
2.9 |
2.63 |
3.46 |
| Oil Absorption (g/100g) |
18.8 |
11.1 |
40.5 |
12.9 |
16.7 |
15.1
|
32.3 |
28.5 |
| Median Particle Size (um) |
2.7 |
2.3 |
3.3 |
4.4 |
2.6 |
3.7 |
1.2 |
1.5 |
| pH Solubility (g/100mL) |
8.4 |
6.5 |
6.5 |
6.5 |
8.4 |
8.9 |
9.4 |
8.9 |
| Moisture (%) |
0.25 |
0.1 |
0.4 |
0.2 |
0.2 |
0.15 |
0.8 |
0.87 |
| Residue on 325 Mesh Screen, % max. |
<0.1% |
<0.1% |
<0.2% |
<0.1% |
<0.1% |
<0.1% |
<0.1% |
<0.1% |
| Specific Resistance |
5500 |
|
|
|
6700 |
8600 |
|
800 |
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