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Vermiculite is a member of the phyllosilicate group of minerals, resembling mica in appearance. It is one of the safest, most unique minerals in the entire world. A hydrated Magnesium Aluminum Silicate, it is lightweight, inorganic (incombustible), compressible, highly absorbent, non-reactive (yet compatible in many chemical compositions as a functional filler), may have a high cation exchange capacity (surface chemistry may be modified).

Vermiculite is found in various parts of the world, but currently the major mines are located in South Africa, China, Brazil, Zimbabwe, and the United States.Large operating mines today in China are located in Hebei and Xinjiang. It is mined and refined using a variety of techniques and supplied commercially in a range of particle size grades of vermiculite concentrate (unexpanded).

The vermiculite ores from these mines are different forms of hydrated phlogopite or biotite mica which has the remarkable ability of being able to expand to many times its original volume when heated---a property known as exfoliation. Vermiculite mines are surface operations where ore is separated from other minerals, and then screened or classified into several basic particle sizes.

When subjected to heat, vermiculite has the unusual property of exfoliating or expanding into worm-like pieces (the name vermiculite is derived from the Latin 'vermiculare' - to breed worms).
This characteristic of exfoliation, the basis for commercial use of the mineral, is the result of the mechanical separation of the layers by the rapid conversion of contained water to steam.

The increase in bulk volume of commercial grades is 8 to 12 times, but individual flakes may exfoliate as many as 30 times. There is a color change during expansion that is dependent upon the composition of the vermiculite and furnace temperature. The bulk density of crude vermiculite or vermiculite concentrate is in the range of 640-1120 kg/m3 and exfoliated or expanded vermiculite is in the range of 64-160 kg/m3.

Vermiculite has been used in various industries for over 80 years. It is mainly used in the construction, agricultural, horticultural, and industrial markets.
Applicant of Vermiculite：

Industrial Application		Construction Application	Horticultural Application	AgriculturalApplication
Absorbent packing	Furnaces	Acoustic finishes	Blocking mixes	Animal feed
Brake pads for brake	Insulation blocks	Air setting binder	Hydroponics	Anti-caking material
Castables	In high & low temperature	Board	Micro-propagation	Bulking agent
Dispersions	Molten metal insulation	Fire protection	Potting mixes	Fertilizer
Drilling muds	Moulded products	Floor & roof screeds	Rooting cuttings	Pesticide
Filtration	Nuclear waste disposal	Insulating concrete	Seed germination	Seed encapsulant
Fireproof safes	Paints	Gypsum plaster	Seedling wedgemix	Soil conditioner
ix hazardous materiasl	Sound deadening compounds	Loft insulation	Sowing composts	Twin scaling bulbs

■　Golden Crude Vermiculite：Crude Vermiculite Flake Flakes of raw vermiculite concentrate are micaceous in appearance and contain interlayer water in their structure. When the flakes are heated rapidly at a temperature above 870° C, the water flashes into steam, and the flakes expand into accordionlike particles. This process is called exfoliation, or expansion, and the resulting lightweight material is chemically inert, fire resistant, and odorless.

Composition	SiO2	Al2O3	MgO	CaO	PH	Fe2O3	Impurity
Content (%)	44.48	16.11	16.56	2.44	7-10	6.27	< 7

( Size: 0.3-1mm/1-2mm/1-3.5 mm /3.5-7 mm or as per customers' request )

Expanded Vermiclite ：

Size	Density (Kg/M3)	Water Absorption(%)	Thermal Conductivity (k·m2·h·℃)	Impurity(%)
8mm Above	70-110	480	0.045	≤3
4-8mm	70-110	480	0.045	≤3
3-5mm	80-120	465	0.045	≤3
1-3mm	80-150	430	0.045	≤3
20-40mesh	100-160	410	0.045-0.055	≤2
40-70mesh	100-170	410	0.045-0.055	≤2
70-100mesh	100-170	400	0.045-0.055	≤2
150mesh	100-18	400	0.045-0.055	≤1
200mesh	100-180	400	0.045-0.055	≤1
325mesh	100-180	400	0.045-0.055	≤1
Blended Grade	90-180	430	0.045-0.055	≤3

( Size: 0.3-1mm/1-2mm/1.5-3.5mm/2-4mm/3.5-7mm/4-8mm/20-40mesh/70-100mesh/325mesh or as per customers'request )

■　Silvery Crude Vermiculite:

Chemical analysis:

Composition	SiO2	AL2O3	MgO	CaO	FeO	Fe2O3	TiO2
Content (%)	41.2	12.68	24.22	0.96	1.54	4.06	1.33
Composition	K2O	P2O5	H2O	Na2O	MnO	Impurity	L.O.I.
Content (%)	5.97	0.06	3	1.6	0.043	< 5	6.71

Size: 0.3-1mm/1-2mm/2-4mm

Silvery Exfoliated Vermiculite

Expanded Vermiclite

Size	Density (Kg/M3)	Passing Rate (%)	Thermal Conductivity (k·m2·h·℃)
4-8mm	70-110		0.045
2-4mm	80-120		0.045
1-2mm	80-150		0.045
20mesh	80-180	98	0.045-0.055
40mesh	100-180	98	0.045-0.055
60mesh	100-180	98	0.045-0.055
100mesh	100-180	95	0.045-0.055
200mesh	100-180	95	0.045-0.055
250mesh	100-180	95	0.045-0.055
325mesh	100-180	95	0.045-0.055
Blended Grade	70-180		0.045-0.055

( Size: 1-3mm/3-6mm/4-8mm or as per customers'request )