Quartz Graded Seals
To overcome the differences in thermal expansion coefficients, Robson Scientific manufactures graded seals to bridge the difference by using a series of intermediate sealing glasses between the two working ends.
Graded Seals - Quartz to Borosilicate
| Nominal Tubing Bore mm |
Nominal Tubing Dia. mm |
Nominal Length of Quartz mm |
Nominal Overall Length mm |
Ref No. |
|---|---|---|---|---|
| 4 | 6 | 50 | 150 | RQPGS/ 4 |
| 6 | 8 | 50 | 150 | RQPGS/ 6 |
| 8 | 10 | 50 | 150 | RQPGS/ 8 |
| 10 | 12 | 50 | 150 | RQPGS/10 |
| 15 | 18 | 50 | 150 | RQPGS/15 |
| 20 | 23 | 75 | 160 | RQPGS/20 |
| 25 | 28 | 75 | 160 | RQPGS/25 |
| 30 | 33 | 75 | 160 | RQPGS/30 |
| 35 | 38 | 75 | 160 | RQPGS/35 |
| 40 | 44 | 75 | 160 | RQPGS/40 |
| 45 | 49 | 100 | 200 | RQPGS/45 |
| 50 | 54 | 100 | 200 | RQPGS/50 |
Graded Seals - Quartz to Kodial/Schott 8250
| Nominal Tubing Bore mm |
Nominal Tubing Dia. mm |
Nominal Length of Quartz mm |
Nominal Overall Length mm |
Ref No. |
|---|---|---|---|---|
| 4 | 6 | 50 | 150 | RQSGS/ 4 |
| 6 | 8 | 50 | 150 | RQSGS/ 6 |
| 8 | 10 | 50 | 150 | RQSGS/ 8 |
| 10 | 12 | 50 | 150 | RQSGS/10 |
| 15 | 18 | 50 | 150 | RQSGS/15 |
| 20 | 23 | 75 | 160 | RQSGS/20 |
| 25 | 28 | 75 | 160 | RQSGS/25 |
| 30 | 33 | 75 | 160 | RQSGS/30 |
| 35 | 38 | 75 | 160 | RQSGS/35 |
| 40 | 44 | 75 | 160 | RQSGS/40 |
| 45 | 49 | 100 | 200 | RQSGS/45 |
| 50 | 54 | 100 | 200 | RQSGS/50 |
| Intermediate diameters are charged to the next size up. Optical windows can be sealed to the ends of graded seals if required. Prices available on request. | ||||