Everthing about WelchLab's Serological Pipettes
The Serological pipette is a type of pipette used to transfer milliliter volumes of liquid, and precision and safety are often concerns when selecting from different pipette suppliers. At Welch, we produce single-use Serological pipettes with precise graduation markings, convenient designs, and free from contamination.
Table of Contents
Structure
- 1. Top end: The top end is made of polystyrene (PS) using injection molding. It connects to pipettes, and cotton cores can be inserted into it.
- 2. Filter plug: The filter plug is made of cotton or PET inside the top end. It has high mesh number to prevent contamination.
- 3. Color code: Two colored rings near the top end. Liquid must not exceed the color code. The color of the code also indicates the capacity of the pipette.
- 4. Pipe body: Made of polystyrene using extrusion molding. It is the main body that stores liquid.
- 5. Scale line: The ring lines that function as graduation marks.
- 6. Delivery tip: Made of polystyrene using injection molding; a conical structure at the bottom of the pipette, uniformly tapered at the orifice.
Capacity
A variety of volume capacity can be selected, from 1 mL to 50 mL and, in rare cases, 100 mL. The capacity of a pipette can be indicated by the color of the ring code near the top: purple indicates a maximum of 50 mL, red 25 mL, orange 10 mL, blue 5 mL, green 2 mL, yellow 1 mL, and black 100 mL.
Graduation Marking
One of the standout features for our Serological pipettes is the bidirectional graduation markings used for aspiration and dispension separately. Negative marks are also deployed to offer a more precise control over liquid handling. For instance, using a 10 mL pipette with negative markings allows for a more precise aspiration of 12 mL of liquid compared to using a larger 25 mL pipette.
Moreover, the graduations can be made inkless, removing the risk of ink contamination so that your samples remain pure and uncontaminated throughout the process.
Negative graduation on a pipetteFilter
Filtration plays another important role in preventing contamination. Filters in our Serological pipettes have high mesh numbers, preventing contamination from passing through during aspiration.
Production
Our pipettes are manufactured in ISO 9001-certified Class 100,000 (ISO 8) cleanrooms, free from pyrogens, endotoxins, DNase, and RNase. In sterilization process, Gamma irradiation, a proven method that ensures sterility, is employed.
Precautions
1) Choose a pipette of suitable volume (and consider negative marking).
2) When removing pipettes from their paper-plastic packages, use both hands as the below figure shows. Otherwise, remove them from the plastic side, with the paper side fixed.
3) After removing from its package, a pipette can ONLY contact with the target liquid.
4) Hold the pipette vertically when reading the graduation marks.
