Production of Fire Retardant Filler Grade Hydrate

Hi Friends,

In present post, we will discuss about specifications, production process route and applications of Fire retardant filler grade hydrate.

Fire retardant grade hydrate releases over 30% water vapors on heating at more than 200^oC, thus it has more fire retardancy because of formation of water vapour cloud as per following reaction-

2Al(OH)₃  = Al₂O₃ + 3H₂O

The above reaction is endothermic absorbing about 280 k. calories per kg of hydrate. The maximum decomposition rate occurs at around 350^oC.

The hydrated alumina also imparts better surface finish. It has improved mechanical properties because of larger surface.

Product Specifications:

Typical quality specifications of Fire retardant filler grade are outlined below-

Al(OH)₃ : 99.5% min.

Al₂O₃: 64.0% min.

Fe₂O₃: 0.012% max.

SiO₂: 0.012% max.

Na₂O: 0.20% max.

Moisture: 0.40% max.

LOI at 1100^oC: 34.5%

Median particle size (d₅₀): 2-10 microns.

Production Process route:

The basic principle for manufacture of Fire retardant filler grade hydrate involves surface treatment of superfine hydrate.

The Superfine hydrate is mixed with small quantity of Stearic acid in dry mixer and dried at around 110^oC. The dried hydrate is dispersed in Air jet mill with adjustable classification mechanism for production of Fire retardant filler grade hydrate. This specialty grade has following advantages-

·         Large reduction in viscosity,

·         Improved dispersability,

·         Improved physical properties to composites,

·         Higher loadings.

Industrial Applications:

Major applications Fire retardant filler grade hydrate are listed below-

• Fiber glass products,
• Artificial marbles,
• Glass and glazed tiles,
• Carpet backing,
• Smoke suppressant fillers in rubber products,
• Fiber cement boards,
• Cables,
• Thermosetting plastics..

The data / informations published here are purely personal experience in the field and no way related to any company / organization.


We seek your views / suggestions / remarks / comments on above.
Regards.


Kunwar Rajendra