ASSAY GRADE LEAD FOIL, ASSAY GRADE LEAD TABLETS
We supply a whole range of assay grade lead foil (assay lead tape), assay lead tablets, silver inquarts and cooper inquarts for cupellation.
ASSAY LEAD
Our assay lead has low gold, silver, platinum group metals and bismuth content, ensuring an exact analysis and also in accordance with ISO11426 for the determination of gold in jewellery alloys. Content of gold and of each of the elements of the platinum group metals (Pt, Pd, Rh, Ru, Ir) of less than 2 ppm (0.002 ‰).
Indeed, the purity of our assay lead foil (assay lead tape) and assay lead tablets is 99.99%. 99.999% purity lead foil is also available for special analysis where the precious metal content to determine is very low.
ASSAY GRADE LEAD FOIL ACCORDING TO ISO11426: 2021
Our assay lead foil rolls (assay lead tape) come in various widths and weights.
The thickness of our assay lead foil is 0.1 mm. This ensures an easy wrapping of the sample, and of the silver inquarts.
Furthermore, we can also stock precut assay lead foil of 3g, 4g, 6g, 8g and manufacture other measures under order.
ASSAY GRADE LEAD TABLETS TO ISO11426: 2021
On the other hand, some users prefer assay lead tablets. Our range for lead tables starts at 2g and ends at 10g.
Using Assay Lead Tablets is particularly convenient because they allow to put a precise quantity of lead in the cupel wihtout having to previously weight them.
| Lead foil roll | |
|---|---|
| width (mm) | Weight (kg) |
| 40 | 5 |
| 50 | 5 |
| 50 | 10 |
| 70 | 10 |
Precut lead foil
Dimensions (mm) Weight (g)
40 x 37 x 0.18 3
60 x 60 x 0.1 4
70 x 75 x 0.1 6
70 x 80 x 0.125 8
Finally, lead foil with a 99.999% purity is also available.
| Assay Lead Tablets | |
|---|---|
| Dimensions (mm) | Weight (g) |
| Ø 10 x 1,1 | 1 |
| Ø 10 x 2,2 | 2 |
| Ø 8 x 4,5 | 3 |
| Ø 9 x 6 | 4 |
| Ø 10 x 5.5 | 5 |
| Ø 10 x 6.5 | 6 |
| Ø 10 x 8 | 7 |
| Ø 10 x 11 | 10 |
| Ø 15 | 15 |
| Ø 20 | 25 |
GRANULATED ASSAY LEAD / GRANULAR LEAD
High purity 99.99% or 99.999% Granulated Assay Lead with a low silver content. Its main applications are for scorification and cupellation.
Supplied in bags of 5kg, size of the granules is 2.5mm.
Last but not least, it is much less hazardous than lead dust, and it is possible to handle it with just gloves.
ASSAY LEAD IN CUPELLATION
The recommended quantity of assay grade lead for cupellation is about 20 grams of lead for every gram of gold. However, when analysing white gold it is necessary to double this lead quantity. In addition to that, ISO11426 recommends using Magnesium Oxide Cupels, usually of diameter 22 mm to absorb 6 g lead, or of diameter 26 mm to absorb 10 g lead, or blocks of cupels of similar absorption. This is equivalent to our cupel nº 4A or to any of our blocks.