9AS Fire Assaying Milky White Magnesia Cupels For Gold Melting

              9AS Magnesium Oxide Cupel For Gold Melting

Application :

It's widely used in Fire Assaying,Gold Assaying

Thransport: Air transport: 5-9 days; Ocean shipping: About one month.

Delivery Time:

1. Stock:delivery within 3-5 days after receiving your payment.

2. OEM/ODM:The normal Lead time is 15-40 days, which depends on your quantiy..

Features:

1. Made of Magnesite

2. Used for smelting and assaying

3. High thermal shock resistance

4. Magnesia: ≥95%

5. Silica, Silicon dioxide: 0-5%

6. Property: high refractoriness(1100 centigrade degrees),rapid absorption(70%),and recovery rate of 97%-98.5%,easy to use, without milling.

Notes:

      We can do OEM and OBM According to your drawing and requirements.

      The diffusivity of heat and the specific heat of magnesia cupels are greater than those of bone-ash cupels. If similar cupellations be conducted in bone-ash and in magnesia cupels side by side, a marked difference will be seen in the behaviour of the lead. The lead on the bone-ash cupel during the cupellation is very bright, whereas the lead on the magnesia cupel is comparatively dull during a considerable part of the operation and is not so hot, although the muffle temperature is the same for both. "This is due to the fact that the extra heat generated by the oxidation of the lead is diffused as soon as it is generated, owing to the superior diffusivity of the magnesia cupel and hence cannot serve to raise the temperature of the lead, as is the case in the bone-ash cupel. Hence for the same 'muffle temperature' the actual cupellation temperature of the lead in the magnesia cupels is 50° to 60º C lower than in the bone-ash cupels.