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If there are any questions regarding this privacy policy you may contact us using the information below.

Xeron ESK AG / Xeron ESK Ltd / Xeron ESK SA
Bottigenstrasse 391
CH - 3020 Bern
Switzerland

http://www.xeron-esk.ch
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Tel + 41 76 321 24 29
Fax

Registration No: CHE-350.537.054, Kanton Bern

Contact

Xeron ESK AG / Xeron ESK Ltd / Xeron ESK SA
Bottigenstrasse 341
3019 Bern - Switzerland
Postfach 568, CH - 3000 Bern 14

Web: http://www.xeron-esk.ch
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Telephone: + 41 76 321 24 29

Silicon Carbide

S

ince we are in the Silicon Business over 20 years now we can procide all sorts and specifications of Silicon material. High pure Polysilicon as well as Silicon Metal and also Silicon Carbide.

Silicon carbide (SiC), also known as carborundum /kɑrbəˈrʌndəm/, is a compoundof siliconand carbonwith chemical formula SiC. It occurs in nature as the extremely rare mineral moissanite. Silicon carbide powder has been mass-produced since 1893 for use as an abrasive. Grains of silicon carbide can be bonded together by sinteringto form very hard ceramicswhich are widely used in applications requiring high endurance, such as car brakes, car clutches and ceramic platesin bulletproof vests. Electronic applications of silicon carbide as light emitting diodes(LEDs) and detectorsin early radios were first demonstrated around 1907, and today SiC is widely used in high-temperature/high-voltage semiconductor electronics. Large single crystals of silicon carbide can be grown by the Lely method; they can be cut into gems known as synthetic moissanite. Silicon carbide with high surface area can be produced from SiO2 contained in plant material.

Natural occurrence

M

oissanite single crystal (≈1 mm in size) Naturally occurring moissaniteis found in only minute quantities in certain types of meteoriteand in corundum deposits and kimberlite. Virtually all the silicon carbide sold in the world, including moissanite jewels, is synthetic. Natural moissanite was first found in 1893 as a small component of the Canyon Diablo meteoritein Arizonaby Dr. Ferdinand Henri Moissan, after whom the material was named in 1905. Moissan's discovery of naturally occurring SiC was initially disputed because his sample may have been contaminated by silicon carbide saw bladesthat were already on the market at that time.

While rare on Earth, silicon carbide is remarkably common in space. It is a common form of stardustfound around carbon-rich stars, and examples of this stardust have been found in pristine condition in primitive (unaltered) meteorites. The silicon carbide found in space and in meteorites is almost exclusively the beta-polymorph. Analysis of SiC grains found in the Murchison meteorite, a carbonaceous chondritemeteorite, has revealed anomalous isotopic ratios of carbon and silicon, indicating an origin from outside the solar system; 99% of these SiC grains originate around carbon-rich asymptotic giant branchstars. SiC is commonly found around these stars as deduced from their infrared spectra.

Production

B

ecause of the rarity of natural moissanite, most silicon carbide is synthetic. It is used as an abrasive, and more recently as a semiconductorand diamond simulantof gem quality. The simplest manufacturing process is to combine silicasandand carbon in an Acheson graphite electric resistance furnaceat a high temperature, between 1600 and 2500 °C. Fine SiO particles in plant material (e.g. rice husks) can be converted to SiC by heating in the excess carbon from the organic material. The silica fume, which is a byproduct of producing silicon metal and ferrosilicon alloys, also can be converted to SiC by heating with graphite at 1500 °C.

 

Synthetic SiC crystals ~3 mm in diameter
Synthetic SiC Lely crystals

The material formed in the Acheson furnace varies in purity, according to its distance from the graphiteresistorheat source. Colorless, pale yellow and green crystals have the highest purity and are found closest to the resistor. The color changes to blue and black at greater distance from the resistor, and these darker crystals are less pure. Nitrogen and aluminium are common impurities, and they affect the electrical conductivity of SiC.

Pure silicon carbide can be made by the so-called Lely process,in which SiC powder is sublimated in argonatmosphere at 2500 °C and redeposited into flake-like single crystals, sized up to 2×2 cm2, at a slightly colder substrate. This process yields high-quality single crystals, mostly of 6H-SiC phase (because of high growth temperature). A modified Lely process involving induction heatingin graphite cruciblesyields even larger single crystals of 4 inches (10 cm) in diameter, having a section 81 times larger compared to the conventional Lely process. Cubic SiC is usually grown by the more expensive process of chemical vapor deposition (CVD).
Homoepitaxial and heteroepitaxial SiC layers can be grown employing both gas and liquid phase approaches.Pure silicon carbide can also be prepared by the thermal decompositionof a polymer, poly (methylsilyne), under an inert atmosphereat low temperatures. Relative to the CVD process, the pyrolysis method is advantageous because the polymer can be formed into various shapes prior to thermalization into the ceramic. (Source: Wikipedia)

Silicon Carbide
Black Silicon Carbide

B

lack silicon carbide is produced in an electric resistance furnace by adding Quartz and raw petroleum coke. SiC is extensively used in producing Refractory Tiles and bricks, castables as well as trough and tap hole mass. It is cleaner than coal and can therefore easily be used for reduction processes to produce cleaner steel, if necessary.

Sometimes it is also used as sintered Silicon Carbide powder in the production of very hard ceramics. Applications are high endurance requiring such as car brakes, ceramic pastes and bulletproof vests.

Silicon Carbide

97% Silicon Carbide Specifications

Product:

Size:

Applications:

97% Silicon Carbide
Code: 259997

3" x 1"

 

Packaging

Chemical Specifications (Typical)

SuperSacks
Bulk

SiC 97%

Si = 68.0%

C = 29.0%

Free Carbon

0.60%

SiO2

0.70%

Al2O3

0.15%

Fe2O3

0.50%

Sulfur

0.07%

Moisture

<1.0%

 
  • Silicon Carbide 97 % Min (For Refractory bricks, shapes and castables)
    Product Specifications:
    Elements Spec Sic 97% Min Free Carbon 0.5 % Max Fe2O3 1.0 % Max SiO2 1.5% Max 80% and 90 % Silicon carbide is used as a metallurgical additive as a source of Silicon. This acts as a de-oxidising agent as well in removing blowholes etc.
  • Silicon Carbide 90 % Min
    Products Specification:
    SiC 90% Min Free Carbon 3 % Max Fe2O3 2.5 % Max SiO2 4.0% Max
    Size: Lumps 0-20mm or 0-1,1-3,3-5mm
  • Silicon Carbide 85 % Min (For tap hole clay and trough mass)
    Product Specifications:
    Elements Spec Sic 85% Min Free Carbon 4.5 % Max Fe2O3 4.5 % Max SiO2 5.0% Max
    Size: Lumps 0-20mm or 0-1,1-3,3-5mm
  • Silicon Carbide 80 % Min
    Products Specification:
    SiC 80% Min Free Carbon 6.0 % Max Fe2O3 6.0 % Max SiO2 7.0% Max

 

Aircrafts & Trucks

We have on a constant bases a vast choice of available private as well as commercial planes. Some of the aircrafts we currently offer are shown underneath.

Aircraft Technical Data Sheet

  • Aircraft Type: Airbus A320-214
  • Engine Model: CFM56-5B4/P
  • Date of Manufacture: 2012
  • Noise Abatement Compliance: Stage III iaw. ICAO Annex 16
  • Interior Arrangement: 174 All Tourist
  • Lavatory: 3
  • Galleys (with chiller): G1,G5 (Bucher), with ATLAS Boxes &Trolleys

Aircraft Technical Data Sheet

  • Aircraft Type: B737‐ 800
  • Engine Model: CFM56 - 7B24/3
  • Date of Manufacture: 2010
  • Serial Number:TBD
  • Line Number:TBD
  • Variable Number:TBD
  • Registration Number:TBD
  • Noise Abatement Compliance:Stage III iaw. ICAO Annex 16
  • Winglets: Yes
  • Approach Category: CAT III B
  • Interior Arrangement: 186 All Tourist
  • Lavatory: 3
  • Galleys: G1, G2, G4B, G7 (Britax Sell)

 For further information and specification of each plane, please don’t hesitateand get in touch with us.

We have continuously large quantities of trucks to offer.
If you are interested in getting quantities and prices, please send us an email to This email address is being protected from spambots. You need JavaScript enabled to view it.


Iveco Stralis 430

Fertiliser

Prilled Urea and Granular Urea
Formula: Urea is widely used in the agricultural industry as an animal feed additive and fertilizer. With 46 % nitrogen, it is an efficient source of nitrogen in fertilizers. [NH₂CONH₂]

Prilled Urea

P

rilled urea, or "prills" are formed by dropping liquid urea from a prilling tower into droplets that dry into roughly spherical shapes 1mm to 4 mm in diameter.

Granular Urea

G

ranular urea is chemically the same as prilled urea. Granular urea, however, is slightly larger and harder. Today, the use of prilled urea is more prevalent because it is more resistant to breaking down when being blended with the other components of fertilizer.

Description:
Urea is the most popular and economical of all nitrogenous fertilizers being used worldwide. Urea has a nitrogen content of 46%, a higher concentration than this is available in other solid sources of nitrogen. Unlike phosphate and potassium fertilizers, which normally require a single application, urea needs to be applied several times during the growing season. Urea is an ideal source of nitrogen for all kinds of crops (wheat, barley, rice, maize etc.) In addition, urea is a major raw material for melamine, and an important raw material for the manufacture of other industrial products.

Urea

Properties

Unit

Quantity / Description

 
Spherical shape   granules
Melting point °C around 132
Molecular weight amu 60

Granular Urea specifications

Properties

Unit

Quantity

 
Total nitrogen wt % 46 min
Biuret content wt % 1% max
Formaldehyde (HCHO) wt % 0.45 min
Crushing strength kg 2 min
Moisture wt % 0.5 max
Particle size wt % 2-4 mm....90% min
> 4 mm....7% max
+2.8 mm....60% min

Prilled Urea specifications

Properties

Unit

Quantity

 
Total nitrogen wt % 46 min
Biuret content wt % ≤ 1
Moisture wt % ≤ 0.5
Particle size wt % 1-2.8 mm....90% min

Hazards and safety

The product is relatively safe and chemically stable. When it decomposes it produces hydrogen cyanide, ammonia, oxides of nitrogen and carbon. As a dust, it may form an explosive mixture with air.

Applications

Broadcasting or in irrigation water (fertigation); best if split applied at least three times throughout the growing season; suitable for all crops across a wide range of environmental conditions.