The Egyptian Co. for Manufacturing Perlite & Vermiculite

Because of its unique properties, perlite insulation has found wide acceptance in the insulating of cryogenic and low temperature storage tanks, in shipping containers, cold boxes, test chambers and in food processing.
Storage temperatures ( - 100° C ) and below are considered cryogenic. Storage temperatures ( - 100° C ) and above to ( + 4° C ) are considered low temperature. Super cold or extremely cold cryogenic fluids such as hydrogen and helium are normally stored in spherical, double walled vessels with evacuated annular spaces using evacuated perlite.

Perlite insulation suitable for nonevacuated cryogenic or low temperature use exhibits low Thermal conductivity throughout a range of densities, however, the normal recommended density range is ( 48 to 72 kg/m3 ).
In addition to its excellent thermal properties, perlite insulation is relatively low in cost, easy to handle and install, noncombustible and meets fire regulations, lowers insurance rates, does not shrink, warp or slump. Because it is an inorganic material, it is rot and vermin proof. As a result of its closed cell structure, the material does not retain moisture.

There are many different design concepts for low temperature and cryogenic storage vessels. However, most are of double wall construction with the annulus filled with expanded perlite. Packaged or bulk perlite may be used to insulate smaller vessels by pouring or blowing the insulation in place. Portable perlite expansion plants are usually used to insulate storage tanks, cold boxes, ships, and other double wall vessels and pipes. In these applications' perlite ore is expanded on-site and the expanded perlite insulation is conveyed pneumatically into the annulus.

Density                                                                      48 to 72 kg/m3
Sieve Analys In( mesh is U.S. Standard )
Percent Weight Retained
                                  Max. 10% + 16 mesh ( 1.18 mm )
                                  Min. 50% + 100 mesh ( 0.15 mm )
Thermal Conductivity*
              Low Temperature Applications
                                  ( at mean temperature – 40° C )
              Nonevacuated Cryogenic Applications
                                  ( at mean temperature – 126° C )

(0.025-0.029 W/m . K )

* Thermal conductivity varies with temperature, density pressure, and conductivity of the gas which fills the annulus or insulation space.

Jeans has became a great fashion necessity all over the world. Jeans Manufacturers has used many products like stones, enzymes and pumice to create what is the called stone washed jean look" to keep up with fashion of aged fabric" looks worn and feels softer "

The old Manufacturing process of stone washed jeans involved washing out the sizing then washing the denim in large industrial Machines and they used enzymes or stones and some times both.

This process of traditional stone washing was effective in giving a good result of jean products that looked worn and comfortable but this process has abused the large expensive washing machines and some times basic denim can be abraded too much.

Perlite product has been tested by major jean manufacturers. The results where astonishing, using perlite has reduced the maintenance of the washing machines and achieved a softer and better looking finish.

After many tests using various grades of perlite it was found that perlite performs many of the same properties as stones, but perlite gives us a much softer, pliable finish, and it reduces the weariness and distraction of the washing machines. Perlite gave the jean producers a better product because it gave them a warn finished look throughout the fabric and not only on the surface. Expanded perlite has allowed a reduction in the use of enzymes which chemically attacks the fibers and ultimately results in a quick wear- out of the fabrics.

Perlite grain varies From 0 – 5 mm The jean manufacturers are the ones that choose witch perlite grain size is more suitable for them. The Exact grain size and special enzymes that are used in stone washing are considered proprietary process information by all of the large jean company's. Using stone washing perlite in most the jean company's is increasing rapidly all over the world, and that is a well known fact.