Lava Rock

Radiants / Heat Diffusers

Heat diffusers / radiants (lava rock) should critically provide even heat distribution across the grill, be self-cleaning and easy to remove. The familiar flavour produced by charcoal grilling comes from the juices of the food dripping onto the hot lava rock. Gas grills use several materials to produce the same effect.

White Lava Rock

White lava rock heats quickly and disperses the heat to the interior of the grill. Due to its smoother surface white lava rock collects less residue and produces fewer flare-ups. The uniform size ensures even heat distribution for better cooking performance. The stones can be cleaned by turning them over to burn off any residue.

Red Lava Rock

Red lava rock also heats quickly and disperses the heat to the interior of the grill. Red lava rock is more porous and allows grease to accumulate, however this lessens its efficiency and increases the possibility of flare-ups. Both types of lava rock should be replaced regularly, or turned over to expose a fresh surface.

The white and red lava can be packaged according to customers individual needs, the standard being 2 x 4.5kg bags per carton.

Compound Element   Chemical Formula Typical Content
Silicon Dioxide SiO2 74.55%
Aluminium Oxide Al203 12.45%
Potassium Oxide K2O 4.50%
Sodium Oxide Na2O 4.00%
Ferric Oxide Fe2O <2.00%
Calcium Oxide CaO <2.00%
Magnesium Oxide MgO <2.00%
Titanium Dioxide TiO2 <2.00%
Sulphur Trioxide SO3 0.20%
Manganese Oxide MnO 0.10%
Carbon Dioxide CO2 0.10%
Ferrous Oxide FeO 0.06%
Phosphorous Pentoxide P2O5 0.005%
Combined Water H2O+ 4.35%

Determined by FAAS

4. Physical  Properties

a. Bulk Density 0.50 – 0.75g/cm3
b. Melting Point 1200 oc
c. pH Value 7.0 – 8.0
d. Specific Gravity 2.40 g/cm3
e. Hardness 5.5 Mohs
Radiant Heat Diffuser Yes
Charcoal Grills Yes
Artificial Coal Yes

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