Glassware Catalog

Cold Traps and Vacuum Traps - Sigma-Aldrich® Glassware Catalog



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Dean-Stark Traps • Cold-Traps & Vacuum Traps


On this page:
Dry ice condenser-traps
Double-surface cold-trapTwo-piece vacuum traps
Large capacity cold traps
Cold-traps with ball jointHigh-efficiency cold-trap/Dewar
KOH & cold-trap systemVacuum trapsDouble-chamber vacuum trap


Dry ice condenser-traps



4mm PTFE stopcock.

Reservoir Cap. (mL)
Overall Height (mm)
Catalog Number
250
450
500
470
1,000
490

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Double-surface cold-trap






S.T. 55/50 joint.

Z162833



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Two-piece vacuum traps

Threaded S.T. 45/50 joint. 48 o.d. x 420mm L; 13mm o.d. hose barbs. Constructed for easy removal of condensates.


Description
Catalog Number
A. Hose barbs at 180°
B. Hose barbs at 90°
Replacement bulb for Z17,421-1 and Z17,423-8
Replacement inside finger for Z17,421-1
Replacement inside finger for Z17,423-8




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Large capacity cold-traps




With removable cold-fingers and a choice of S.T. 55/50 joint or 50mm O-ring joint. Traps with O-ring joint include pinch clamp

Description
Complete
Catalog Number
Repl. bulb
Catalog Number
A. Traps with S.T. 55/50 joint 
500mL bulb capacity
1,000mL bulb capacity
Replacement finger
-
B. Traps with 50mm O-ring joint 
500mL bulb capacity
1,000mL bulb capacity
Replacement finger
-
Replacement pinch clamp
-
Replacement O-rings
-



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Cold-traps with ball joint



7cm i.d., 30cm L. Includes pinch clamp. 75 o.d. x 470mm L; 20mm o.d. side tubes.

Description
Catalog Number
65/40 joint
75/50 joint
Replacement parts  
Pinch clamp, for Z12,151-7
Pinch clamp, for Z12,152-5
Bulb, for Z12,151-7
Bulb, for Z12,152-5
Inside finger, for Z12,151-7
Inside finger, for Z12,152-5


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High-efficiency cold-trap/Dewar



Dewar approx. 325mm L. Order cold-finger separately, below, to seal in the coolant.
Desicription
Catalog Number
A. Dewar
B. Cold-fingers, S.T. 45/50 joint
 
      Standard
      Strip-silvered and evacuated


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KOH & cold-trap system

Use Aldrich KOH and cold-traps in tandem to eliminate acidic gases and water vapor, which can damage expensive vacuum pumps. Traps have a 50mm O-ring joint with pinch clamp.


Features:

KOH traps

  • Effective with multiple cold traps
  • Flat-bottom design for maximum stability
  • Glass wool chamber prevents KOH from entering pump
Cold-trap
  • Large capacity
  • Removable cold-finger


Size
L (mm)
I.d. (mm)
Catalog Number
KOH traps
Standard
450
50
Large
610
90
 
Cold-traps
500mL bulb
460
50
1,000mL bulb
475
50
 
Pyrex glass wool    
Potassium hydroxide, pellets, 85+%; A.C.S. reagent [1310-58-3] KOH


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Vacuum traps

The top inlet tube is available in either a straight version or with a 90° angled bend.

O.d (mm)
Overall
H (mm)
O.d. inlet (mm)
Inlet, straight
Catalog Number
Inlet, 90° bend
Catalog Number
13
75
6
25
150
13
25
200
13
35
250
19
45
300
22


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Double-chamber vacuum trap

97 W x 250mm H. Inlet and outlet have serrated fittings, 14 to 16mm.
Can be used in a 2L Dewar flask.

Z154253

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