ul.Przemysłowa 6,
97-400 Bełchatów, Poland

Phone:+48 44 733 02 88
perlipol@perlipol.com.pl

EXPANDED (EXFOLIATED) VERMICULITE

Perlipol sp. j. has a process line for expanded vermiculite. Vermiculite, a mineral, hydrated magnesium aluminium silicate with a highly variable and complicated chemical compound. It crystallises in a monoclinic crystal system, in most of cases in a form of plate clutches. Yellowish, brown, olive colour. It is a product of mica (phlogopite or biotite) erosion. It is mainly mined in the USA, Africa (South Africa and Madagascar), Australia, Asia (China). In Poland, it is found at Lower Silesia, but in volumes not suitable for mining.

A specific property of vermiculite is volume increase (even 30 times) during high temperature treatment, and in this process, expanded vermiculite is produced. Vermiculite in exfoliated (expanded/expanded) form is light, inflammable, compressive, highly absorbable, inert and may have high positive ions exchange ability.

Expanded vermiculite is a good sound and heat insulator (inflammable) suitable for temperatures from below -200° C to +1200° C.

Expanded vermiculite is appropriate for many applications, including the following:

  • in the construction industry: - as a raw material for insulation products (fire and sound resistant), filler, and insulator for light concrete,
  • in the industry - wherever insulation of high- or low-temperature manufacturing processes is required, as a filler, etc.
  • in gardening (as an additive to multi-compound substrates, improving water and air relations, a carrier of positive ions)
  • in animal husbandry, as an additive to forage (a carrier of vitamins and minerals) as well as a padding for animals.

Vermiculite is still applied in many new industries.

 

Example vermiculite applications:

As perlite, expanded vermiculite is applied in the manufacturing of construction materials: insulation and fireproof (its melting temperature is 200 C higher, compared to perlite) and as the filler for manufacturing light concrete.

In the industry, wherever a high or low-temperature insulation of manufacturing processes is necessary, vermiculite is used as a compound of thermal insulation backfills in furnaces and cryogenic chambers.

In the gardening, as an additive to multi-compound substrates, improving water and air relations, a carrier of positive ions and as a mushroom culture substrate.

In animal husbandry, as an additive to forage (a carrier of vitamins and minerals) as well as a padding for animals.

 

VERMICULITE

 

SUPERFINE

FINE

MEDIUM

LARGE

grain size

%

%

%

%

4 mm

   

8-50

55-95

2 mm

0-1

20-35

20-45

3-20

1,6 mm

0-2

18-30

5-20

1-10

1 mm

8-40

20-40

5-20

1-10

0,5 mm

10-55

5-15

5-15

0-8

0,25 mm

10-30

2--10

1-5

0-3

         

Bulk density

110-120 kg/m3

80-100 kg/m3

60-110 kg/m3

70-110 kg/m3

Humidity

max 5%

max 5%

max 5%

max 5%

 

PHYSICAL PROPERTIES

form

solid, in the form of a plate structure with the grain size 0-2

odour

odourless

pH

6.5-9.0

combustibility

non-combustible class A1

relative density

bulk density 60-200 kg per cu m

temperature/melting range

surface 1315oC

self-ignition temperature

N/A

heat conductivity

0.062-0.065 W/m*K

water absorption

3.0-80%

resistance to pressure

0.14-0.40 MPa

chemical resistance

as glass

acoustic absorption

10-92%

specific heat

0.84-1.08 kJ/kgoC

 

CHEMICAL PROPERTIES

Chemical compound

Composition %:

SiO2

38-46%

Al2O3

10-16%

MgO

16-35%

Fe2O3

6-13%

TiO2

1-3%

CaO

1-5%

K2O

1-6%

H2O

8-16%

other

0,2-1,2%