• Penny Head Stoppers with Ground Joint - Clear

Penny Head Stoppers with Ground Joint - Clear

OM-6600-06

  • Lab and Research

Vendor: OMSONS

Suited For: Lab and Research

Country of Origin: India

30-Day Limited Warranty
This product is covered against manufacturing defects in materials and workmanship for 30 days from the date of purchase.

This warranty does not cover: breakage caused by thermal shock (rapid heating or cooling); physical or mechanical damage, including drops, impacts, chips, and cracks from handling; damage from use outside the glassware's rated temperature, pressure, or chemical compatibility; damage from improper cleaning; normal wear such as scratching, staining, or discolouration; or unauthorised repair or modification.

To claim, contact SmartLabs within 30 days of purchase with proof of purchase and a description of the defect.
50 in stock
R 14.95
R 14.95
Tax included. Shipping calculated at checkout.
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These clear penny head stoppers with a ground joint are interchangeable glass stoppers for standard laboratory ground glass joints. They're mainly used to seal volumetric flasks, mixing cylinders and separating funnels.

Technical Specifications

  • Material: Quality 3.3 borosilicate glass with high chemical and thermal resistance.
  • Design:
    • Standard taper (1:10): Precision-ground to fit any standard ground glass socket of the same size.
    • Head style: Penny head (flat circular grip), suited to volumetric flasks.

Available Sizes

Stoppers are sized by cone to match the capacity of the volumetric flask:

Cone Size Application / Capacity
10/19 Volumetric flask (5, 10, 20, 25ml)
12/21 Volumetric flask (50ml)
14/23 Volumetric flask (100, 200, 250ml)
19/26 Volumetric flask (500ml)
24/29 Volumetric flask (1000ml)
29/32 Volumetric flask (2000ml)

Clear or amber? Amber stoppers are needed for light-sensitive reagents. These clear stoppers are the standard choice for general lab solutions and let you see the sample level.

Specifications

  • Material: Clear 3.3 borosilicate glass
  • Drip tip: No
  • Joint size: Select from the drop-down
  • Head: Penny head (flat circular grip)
  • Brand: OMSONS
  • Product of India

Safe Autoclaving Guidelines

To avoid damaging the stopper or the vessel it fits, follow these guidelines:

  • Loosen the joint: Never autoclave a stopper that's firmly seated or greased in a joint. Thermal expansion can crack the glass or leave the stopper permanently stuck.
  • Venting: Leave a path for steam to get in and pressure to equalise. A common tip is to put a thin strip of paper between the ground glass surfaces, or rest the stopper loosely on top.
  • Standard cycles: They typically handle standard autoclave cycles (for example 121°C at 15 psi for 15 to 20 minutes).
  • Avoid rapid cooling: Don't move hot glassware straight into a cold environment or water, as even borosilicate glass can fail with a sudden, extreme temperature change.

Specifications

Material: Borosilicate 3.3 Glass
Taper: Standard Taper 1:10

Delivery

We deliver nationwide across South Africa. Once your order is on its way, you'll receive a tracking link by email so you can follow its progress. If you need your order urgently or you're delivering somewhere hard to reach, contact our team before you check out and we'll help where we can.

Warranty

This product is covered against manufacturing defects in materials and workmanship for 30 days from the date of purchase.

This warranty does not cover: breakage caused by thermal shock (rapid heating or cooling); physical or mechanical damage, including drops, impacts, chips, and cracks from handling; damage from use outside the glassware's rated temperature, pressure, or chemical compatibility; damage from improper cleaning; normal wear such as scratching, staining, or discolouration; or unauthorised repair or modification.

To claim, contact SmartLabs within 30 days of purchase with proof of purchase and a description of the defect.

Our Promise

At SmartLabs, we only stock equipment we'd trust in our own labs and classrooms. If a product arrives faulty or doesn't match its description, let us know and we'll make it right, whether that's a replacement or a refund. Our goal is for every order to work exactly as it should, the first time.