The Egyptian Co. for Manufacturing Perlite & Vermiculite

Perlite is not a trade name but a generic term for naturally occurring siliceous volcanic rock. When Perlite heated to a suitable point in its softening range, it expands 4 to 20 times its original . This expansion is due to the presence of 2-6 % of combined water in the core Perlite rock. When quickly heated to above 8700C the crude rock pops in manner similar to popcorn as the combined water vapor and creates countless tiny bubbles in the glass – sealed bubbles which account for the excellent insulating properties and light weight concrete It is classified as chemically inert and has a pH of approximately 7

Sio2	72 - 76 %
Fe2O3	0.5 - 1.5 %
Al2O3	7 - 11 %
Na2O	2.9 - 4 %
K3O	4 - 5 %
CaO	0.5 - 2.5 %
MgO	0.1 - 0.5 %
TiO2	0.03 - 0.2 %
H2O	2 - 6 %

Color	White
Refractive Index	1.5
Free Moisture, Max.	0.5%
pH	6.5-8.0
Specific Gravity	2.2-2.4
Bulk Density	85-100 kg/m3
Grain Size	0 -5 mm
Softening Point	871-1093° C
Fusion Point	1260-1343° C
Specific Heat	837 J/ kg. k
Thermal Conductivity At (24° C)	0.04 -0.06 W/m.k

Because of perlite’s outstanding insulating characteristics and lightweight, it is widely used as a loose-fill insulation in masonry construction. In this application, free-flowing perlite loose-fill masonry insulation is poured into the cavities of concrete block where it
completely fills all cores, crevices, mortar areas and air holes. In addition to providing thermal insulation, perlite is also ideal for insulating low temperature and cryogenic vessels.

When perlite is used as an aggregate in concrete, a lightweight, fire resistance, insulating concrete is produced that is ideal for roof decks and other applications. Perlite can also be
used as an aggregate with Portland cement and gypsum for exterior applications and for the fire protection of beams and columns.

Other construction applications include under floor insulation, chimney linings, paint texturing, gypsum boards, ceiling tiles and roof insulation boards

Excellent Insulation Material For Insulating External Building Envelop (Roof- Wall – Floor ) .
Light Weight Concrete, Ranging From About ( 320-640 kg/m3 )
Slope To Drain.
Excellent Fire Ratings.
Monolithic Roofing Base.
Insulating f0r Low Temperatures and Cryogenic Gases Storage.

Perlite gives excellent insulating properties at temperature varying from very low to very high. For example, perlite is one of the best known insulations for manufacture and storage of liquid gases such as Oxygen at temperature as low as (-240° C). At the other extreme, it is effective as a ladle cover for molten steel to prevent surface cooling when delays in pouring occurred. At high temperatures begin to soften at about 982° C, while fusion of the particles at the exposed surface begins at about 1260° C. The thermal properties of Perlite are stable for long time and not effected by environmental changes.

Perlite gives excellent sound absorbing materials designed for acoustical treatment to prevent reflection and reverberation of sound from ceilings and upper – Wall areas.

Perlite loose fill provides efficiently insulating masonry walls. Tests have shown that granular perlite poured into cores of concrete blocks can reduce heat transmission by 50% and up to 70 % when it is poured into cavity type masonry walls.

Physical and mechanical properties of Perlite vary according to mix design.

Construction Perlite

THERMAL AND MECHANICAL PROPERTIES OF PERLITE