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  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
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
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
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 .