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Superior properties needed?

Chemical purity, thermal shock resistance, light transmission and other advanced performance characteristics are superior properties demanded by labware applications...

Chemical purity, thermal shock resistance, light transmission and other advanced performance characteristics are superior properties demanded by labware applications.


Quartz offers excellent thermal, electrical, mechanical and optical properties that provide a very high performance for an extensive range of applications through industry.


Extraordinary purity


Fused quartz purity levels are unmatched in the glassware industry and superior to borosilicate products.


The chemical purity and inertness of quartz are essential to many laboratory applications. For example, it can be highly problematical if a lab vessel reacts with its contents and affect the outcome of test. Therefore, the chemical purity is critical and one of the main reasons why many users choose fused quartz vessels.


Supreme thermal properties


Fused quartz beats borosilicate when it comes to heat. Fused quartz is a very stable material at room temperature. At high temperatures, it behaves like all glasses. It does not experience a distinct melting point as crystalline materials.


Fused quartz products can be heated to 1150C under minimal load conditions. It can be quenched into cold water without cracking, due to its high thermal shock resistance. The annealing point is 1140C; strain point is 1070C and fusion point is between 1700C and 1800C.


Quartz flasks are used routinely in petrochemical industry for heating materials such as gasoline. If borosilicate flasks were used instead the borosilicate flasks could break and create a fire.


Because of the exceptional high temperature properties and the low coefficient of expansion flasks made of fused quartz do not break due to the heat or temperature shock. It saves time and money. The initial cost is more expensive but is much safer and will also last longer making them a cost effective solution.


Mechanical durability


Quartz is also very inert and then, extremely chemical resistant.


A glass cup, for instance, can react with the solution it contains and may corrupt the solution contained. Fused-quartz labware is highly resistant to attack by almost all acid and alkaline solutions, even at high temperatures.


Quartz is also an excellent electric insulator. Both electrical insulation and microwave transmission properties are retained at very high temperatures in many applications.


We can actually say that due to the fused quartz properties it can be used and it’s ideal for many industrial applications.



How to purchase a ceramic tube? More...

To many businesses, purchasing ceramic tubes can be a difficult task. However, this can be made very simple if the exact material and size of the tube are known. If this however is not readily available, the more information the supplier receives then they stand a much better chance of meeting the requirements set. As with all applications involving ceramics, the selection process for the material and production method is critical if you are to achieve the most cost effective solution. If you know the exact material and size then this is easy – if not then, here is some information you need to give your supplier to make sure you will get a tube that meets your requirement.


Information needed:


1. Dimensions


a. Outside diameter 

b. Inside Diameter 

c. Number of bores (Single or multi hole tube) 

d. Length 

e. Tolerance (Normal is around +/-5% but if better required let the supplier know) 

f. Straightness


2. Quantity required 

a. Standard sizes can be purchased in small quantities 

b. Special sizes may require a minimum order 

c. One off requirement or repeatable business 

d. Yearly usage estimate


Also important to remember is that the quantity will depend on an estimate of how much the tubes will be used in a year and the expected life of each tube. One-off orders may produce a larger quantity than a repeatable business due to a less consistent flow of deliveries. Standard tube sizes can be purchased in smaller quantities but more irregular sizes, while specific sizes may usually require a minimum order.


3. Configuration 

a. Tube – open at both ends 

b. Tube – Closed at one end (Sheath) 

c. Shape of closed end (Flat ended or round ended. 

d. Any additions (Tubes can be made with flanges at one or both ends)


4. Porosity – Dense or porous 

a. Dependent on material – porous tubes tend to have better thermal shock characteristics


5. Material 

a. If known but if not then working environment details are very important


6. Working environment 

a. Max working temperature 

b. Variations in temperature expected and time to change from Max to min temp 

c. How tube is supported 

d. Vertical or Horizontal in use 

e. Elements in contact with tube 

f. Use (Thermocouple protection, element support etc) 

g. Life expectancy


Conclusion 

A. Tubes can be made by a variety of methods in a selection of different ceramics. 

B. Both the way the tube is made and the material can affect the performance characteristics 

C. Price is effected by 

a. Method of manufacture 

b. Material chosen 

c. Finish requirements (Tolerances etc.) 

d. Quantity


Again, the more information of the environment and requirements given to the supplier, the greater chance they have of producing the correct product.


  • Write By: admin
  • Published In: Education
  • Created Date: 2013-03-09
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