LHe glass cryostats with head flange and constriction

LHe bath cryostats (Dewar flasks) are made of borosilicate glass 3.3 in accordance with DIN/ISO 3585 (DURAN) and are designed for use with liquid helium. As borosilicate glass 3.3 (DURAN) is not helium diffusion-tight, glass cryostats must be designed in such a way that they can be post-evacuated. A glass flange NW 25 with associated clamp and O-ring is used as a standard vacuum connection, so that the connection to the vacuum pump can be made with small metal flange components. On request, a vacuum glass tap or a bonded metal flange can also be offered as a pump flange. The cryostats have a bulkhead flange with an O-ring groove as the head flange.

All helium cryostats are manufactured exclusively to customer order. Changes to dimensions, connections or volumes can usually be made at no additional cost. The Lhe cryostats listed in the table correspond to the most common dimensions and volumes. LHe cryostats are supplied with opposing viewing strips as standard. Of course, the cryostats can also be offered with a visible strip or fully silver-plated.

Free inside diameter at the head flange

Head flange + narrowing

NW 60	57 mm
NW 100	97 mm
NW 120	117 mm
NW150	147 mm
NW 200	197 mm

Technical data

Type	D.I. [mm]	D.A. [mm]	H.I. [mm]	D.I.1 [mm]	D.A.1 [mm]	H.I.1 [mm]	Head flange	H.F. [mm]	Volume [l]
LHC 10-F	60	80	550	16	32	250	NW60	850	2.0
LHC 11-F	70	90	550	16	32	250	NW60	850	3.0
LHC 12-F	80	105	550	16	32	250	NW60	850	4.0
LHC 13-F	99	120	550	24	42	250	NW100	860	6.0
LHC 14-F	104	130	550	28	48	250	NW100	860	7.0
LHC 15-F	124	150	550	32	52	250	NW120	860	9.5
LHC 16-F	136	160	550	32	52	250	NW150	875	11.5
LHC 17-F	158	185	550	32	52	250	NW150	875	15.5