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DISPERAL HP 40
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DISPERAL HP 40

DISPERAL HP 40 is a high-purity boehmite. It exhibits a unique combination of purity, consistency, and dispersibility that makes it an excellent material for use in colloidal applications. The Sasol range of dispersible boehmites has traditionally been used in application such as sol-gel ceramics, catalysis, refractory materials, rheology control, and surface frictionizing.
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Identification & Functionality

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Features & Benefits

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Product Background

DISPERAL is the trademark for the high-purity, highly dispersible boehmite powders and sols/dispersions manufactured by Sasol in Brunsbüttel, Germany, and in Lake Charles, Louisiana, USA. These boehmites (alumina hydrates), which are nano-sized in the dispersed phase, exhibit a unique combinations of purity, consistency and dispersibility that make them excellent materials for use in colloidal applications. The Sasol range of dispersible boehmites has traditionally been used in applications such as sol-gel ceramics, catalysis, refractory materials, rheology control and surface frictionizing. Other applications include surface coating as well as paint detackification, polymeradditives and functional fillers.

Applications & Uses

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Properties

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Chemical Properties
ValueUnitsTest Method / Conditions
Aluminium Oxide Contentmin. 75%-
Silicon Dioxide Contentmax. 0.025%-
Ferric Oxide Contentmax. 0.020%-
Physical Properties
ValueUnitsTest Method / Conditions
Crystallite Size (120)38 - 43nm-
Surface Area (3h/120°C)20 - 40m²/g-
Dispersed Particle Size (d50 water, pH 7)0.5 - 1.5µm-
Dispersed Particle Size (d50 water, pH 4)0.3 - 0.5µm-
Pore Volume1.1 - 1.4ml/g-

Technical Details & Test Data

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Typical Particle Size Distribution of DISPERAL HP 40 in Water

Sasol DISPERAL HP 40 Typical Particle Size Distribution of DISPERAL HP 40 in Water

Preparation of DISPERAL HP 40 Dispersions

In non-polar solvent (toluene or xylene)

In order to prepare a DISPERAL HP 40 dispersion of 25 wt. % DISPERAL HP 40 content, put 50 g of DISPERAL HP 40 powder and 16.7 g of wetting agent MARLOWET 4538 (available from Sasol) under intensive stirring into 133.3 g of xylene or toluene. Mix it with a stirrer and add ultrasound for about 2 minutes. Typically the viscosity is below 10 mPa·s.

In polar solvent (iso-propanol)

In order to prepare a DISPERAL HP 40 dispersion of 20 wt. % DISPERAL HP 40 content, put 40 g of DISPERAL HP 40 powder and 20 g of wetting agent MARLOWET 4538 (available from Sasol) under intensive stirring into 140 g of iso-propanol. Mix it with a stirrer and add ultrasound for about 2 minutes. Typically the viscosity is below 10 mPa·s.

In water (pH 7)

In order to prepare a DISPERAL HP 40 dispersion of 20 wt. % DISPERAL HP 40 content, put 40 g of DISPERAL HP 40 powder and 38 g dispersing aid (available from Lubrizol, BASF or Byk Chemie) under intensive stirring into 122.0 g of water. Mix it with a stirrer and add ultrasound for about 2 minutes. Typically the viscosity is below 50 mPa·s.

In water (pH 3–5)

In order to prepare an alumina sol of 10 (30) wt. % solid content, pour 10 g (30 g) of DISPERAL HP 40 powder under intensive stirring into 90 g (70 g) of 0.09–0.18 (0.34–0.68) % HN03. After stirring for 30 min. the sol is ready for use.

Packaging & Availability

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Regional Availability
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