Silver crucible
Silver å©åŸš
The silver enamel capacity is 100ML, that is, the weight is 100g (the upper and lower is not more than 0.5, the weight is based on the final actual weight), and the purity is 99.99%. With the nationally recognized laboratory purity test report, the silver price will change every day, whichever is the actual price.
Silver Jubilee use and precautions
Management of a silver plaque
1. Place the pliers in the safe when not in use.
2. When the on-duty staff leave the post, they must check the doors and windows, lock the door, return to the post for immediate inspection, and report the problem immediately to the leader.
3. Check if å©åŸš is present and check if å©åŸš is clean.
Two points to pay attention to when using
1. Do not heat directly on an open flame.
2. Do not use too much force when using å©åŸš to avoid deformation or bump, and do not use the tip of the glass rod to take the material inside.
3. not be heated in a crucible or silver molten alkali metal oxide, hydroxide, barium oxide, sodium thiosulfate, and a phosphorus-containing substance containing a large amount of sulfur; alkali metal nitrates, nitrites, oxides Chloride, cyanide, etc. form brittle phosphating platinum and platinum sulfide with platinum at high temperature, and both can erode platinum.
4. The samples containing heavy metals such as lead, bismuth, tin, arsenic, silver, mercury, copper or the like, the compound can not be fired in a crucible and heated.
The heating temperature is not in contact with any other metal (iron plate and an electric furnace, etc.), should pay attention not to touch the high temperature furnace into electrical corner.
6. No treatment halo in a platinum crucible, such as aqua regia, hydrochloric acid and water, and bromine oxidants (chlorates, nitrates, permanganates, manganese dioxide, chromate, nitrite), ferric chloride It has a significant erosive effect on silver and therefore cannot be contacted with ferric chloride.
7. Do not heat or dissolve the material in the platinum crucible.
8. Platinum crucible must be kept clean, and the inside and outside should be bright. After a long time of burning, the appearance of the platinum crucible may be dull, and it will penetrate into the interior for a long time, causing the crucible to be broken. Therefore, the unclean object must be removed.
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