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Details about  1kg Borax (Sodium Tetraborate) decahydrate - fine powder

1kg Borax (Sodium Tetraborate) decahydrate - fine powder See original listing
1kg-Borax-Sodium-Tetraborate-decahydrate-fine-powder
Item Ended
Item condition:
New
Ended:
30 Apr, 2013 10:22:31 BST
Price:
£1.35
[
History:
]
Postage:
£3.50 Economy Delivery | See details
Item location:
United Kingdom, United Kingdom

Description

eBay item number:
280739631469
Seller assumes all responsibility for this listing.
Last updated on  22 Apr, 2013 08:28:43 BST  View all revisions
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Item specifics

Condition:
New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging is ... Read moreabout the condition
 

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BORAX (SODIUM TETRABORATE DECAHYDRATE) 1kg

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Borax 1kg - Fine white powder supplied in a HDPE Bottle.

     
  Molecular formula: Na2B4O7 10H2O
     
 

Uses - Play Slime (science experiment) - When a borax-water solution is mixed with PVA (Polyvinyl alcohol not PVA glue), a rubbery precipitate is formed which is the result of cross-linking in the polymer. This can be coloured a vibrant yellow/green with disodium fluorescein (both PVA and fluorescein are available in our shop)

Flux - A mixture of borax and ammonium chloride is used as a flux when welding iron and steel. It lowers the melting point of the unwanted iron oxide (scale), allowing it to run off. Borax is also used mixed with water as a flux when soldering jewelry metals such as gold or silver. It allows the molten solder to flow evenly over the joint in question. Borax is also a good flux for 'pre-tinning' tungsten with zinc - making the tungsten soft-solderable.

Buffer - Sodium borate is used in biochemical and chemical laboratories to make buffers, e.g. for gel electrophoresis of DNA, such as TBE or the newer SB buffer or BBS (borate buffered saline) in coating procedures. Borate buffers (usually at pH 8) are also used as preferential equilibration solution in DMP-based cross linking reactions.

Co-complexing - Borax as a source of borate has been used to take advantage of the co-complexing ability of borate with other agents in water to form complex ions with various substances. Borate and a suitable polymer bed are used to chromatograph non-glycosylated hemoglobin differentially from glycosylated hemoglobin (chiefly HbA1c), which is an indicator of long term hyperglycemia in diabetes mellitus. Borate and a proprietary synthetic amino acid, Deselex (from Henkel) have been used to complex water "hardness" cations to make a non-precipitating water "softener". Borate alone does not have a high affinity for "hardness" cations, although it has been used for that purpose.

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  Delivery times - These vary widely depending on what country. Typically in Europe packages take less than 7 working days (1½ Weeks). However, this does vary, countries such as Italy appear to have slow internal shipping.
 
   
 
 
 
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