Lava and Pumice - IM-HAMBURG

Tel. +49-40-64208398
Tel.: +49-40-64208398
industrial minerals hamburg
Go to content

Lava and Pumice


Lava and Pumice Lava and pumice stone are volcanic rocks, (volcanic glass, and very similar in chemical composition, which can be acidic or basic. Pumice is lighter than lava rock due to the higher number of pores.

Pumice and lava are porous - up to 85% - and have a low dry bulk density, which in our case (pumice is between 350-500 kg/m³, lava is 500-800 kg/m³ and can therefore float on water.

Our pumice has a high degree of whiteness, and here the higher the pore content and the smaller the bubble size, the lighter the pumice. However, the white colour can change to a grey-brownish colour over time as a result of weathering. Also, brown or black lava rocks tend to be heavier than pumice.

Our pumice comes from the Kayseri area, while the lava stones come from southern Anatolia.


Our pumice and pumice gravel from Central Anatolia is largely free of impurities and clay, so even in its natural state it is equal to the washed pumice of most competitors. In practice, this results in significant cost advantages, as the costly and time-consuming washing process can be omitted. In addition, the moisture content of natural pumice is significantly lower than that of washed pumice, which is usually traded wet. The dry bulk density is between 350-550 kg/m³, depending on the fraction.

The bulk density of our lava stones is particularly low. They vary between 550 and 850 kg/m³. Reddish brown and black lava stones are used in road construction and horticulture, as well as a carrier material in the composition of various plant substrates and cactus soils.
Our deep black lava stones, which are rare in Europe, are exceptional. However, reddish-brown lava stones are also available.

Lava mulch is more compressible than traditional pumice and therefore more effective in preventing soil compaction, reducing evaporation of water from the upper soil layers and is therefore a good alternative to bark mulch.


Basic material for planting substrates

Green roof

Agricultural pumice

lightweight concrete aggregate and for brick production

Road construction

underlayment, facade, flat roof, cavity insulation

Thermal insulation for facades

Filter medium

Oil binder

Filler (for medical and cosmetic applications and in plastics production)



Garden and soil construction

Cement, building materials and construction industry

Chemical industry

Filler for plastics, paper, paints and varnishes


Non combustible

Heat and cold insulating

Low dead weight, low bulk density

Pressure resistant, weathering resistant

Frost and heat resistant

Innert and odorless

Non-toxic (for food industry e.g. as filter medium for water treatment)

High absorbency (also suitable for binding hazardous materials)

Ecological. Pumice can be recycled or disposed of without any problems


Chemical parameters (average values)
SiO2 52-60 %

AlO2 20-25 %

Na2O 7,0-8,0 %

Fe2O3 1,5-2,5 %

K2O 5,0-6,0 %

TiO2 0,5 %

CaO 0,0-2,5 %

Mol. Water ≤ 2%


Pumice, bulk density (naturally moist): approx. 540-800 kg/m³.

Pumice, bulk density (dry): approx. 350-550 kg/m³

Pumice color: white, gray

Lava, bulk density (naturally moist): approx. 600-800 kg/m³

Lava, bulk density (dry): approx. 550-800 kg/m³

Lava color: brown, black

Thermal conductivity: 0.12 W/mK- 0.18 W/mK

MOHS hardness: approx. 4.5

Melting point: approx. 1100 °C

Standard grain sizes: 0-36 mm in gradations

Special grains: on request

Packaging: Big bag, bulk material

EC No.: 215-108-5

Reach: no registration obligation; acc. to EC No. 1907/2006

CAS No.: 332-09-8

Hazardous material: No

All information provided herein is for general and non-binding information purposes only and is not guaranteed to be accurate or complete. It does not constitute a general warranty of product characteristics.

    Industrial Minerals Hamburg MBE Hasan Firat
     Saseler Damm 46 a - D 22395 Hamburg
     Phone: +49-(040)-64208398
Back to content