GLASS SCREWTHREAD UNBADGED THREAD SIZE 24

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Product Code:
  • QSQ24UB
Quickfit® glass screwthread, unbadged, thread size 24, with 140mm long x 22.5mm diameter x 15.5mm bore shank. SQ24UB

GLASS SCREWTHREAD UNBADGED THREAD SIZE 24

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Quickfit® jointed glassware from Scilabware is a comprehensive range of laboratory articles with interconnecting joints, enabling simple to complex chemistry set-ups to be easily constructed and allowing a variety of analytical, development or educational tasks to be undertaken. Precision-engineered, ground glass joints with a standard taper and smooth surface ensure complete interchangeability of elements with the same joint size and the highest standards of leak-tightness.

Quickfit® is manufactured in clear, Pyrex® borosilicate glass, with a low coefficient of expansion, excellent chemical and heat resistance. It conforms to the following standards:

ISO 3585, DIN 12217 - Type 3.3 borosilicate glass
ASTM E-438 Type 1 - Class A borosilicate glass
US Pharmacopoeia - Type 1 borosilicate glass
European Pharmacopoeia - Type 1 glass

Further technical details are available on request.

QSQ-series screwthread joints comprise a versatile system of couplings with standard glass screwthreads to which heat and chemically resistant melamine caps are fitted. An aperture in the top of each cap allows the fitting to pass through and be held in position by compression of a silicone rubber ring inside the cap. A PTFE washer protects the rubber ring and plastic cap from contact with the contents of the glass apparatus. All fittings are readily adjustable and depth of immersion can be altered quickly by slackening the screwcap.

Use under vacuum

Quickfit® screwthread joints give excellent results under vacuum with no appreciable variation in performance between the available cap sizes. However, vacuum holding does tend to vary slightly, relative to the diameter of the insert , but the range 10-3 to 10-4 torr is typical of performance.

Use at temperature

Quickfit® screwcaps,  rings and washers  can be safely  used with apparatus operating up to 300°C providing excessive heat is not applied directly to the screwthread union. Direct heat application above 140°C will result in some discolouration and shrinkage of the screwcap although the rings and washers will be unaffected at this temperature.

Screwcap assembly

When using apparatus which incorporates screwthreads it is important that the PTFE washer is fitted carefully and correctly. This is best achieved by opening out the washer to the correct diameter using a tapered former. This should be carried out with the silicone rubber ring and PTFE washer in position in the plastic cap.

Withdraw the tapered former and remove the rubber ring and washer from the cap. Fit each component separately to the fitting which is to be held; the cap first, then the rubber ring and finally the PTFE washer and screw the cap on to the thread. It is advisable that the ends of all fittings should be slightly tapered or fired in a Bunsen flame to remove sharp edges and produce a slight taper.