Coverslip
Cover Slip is a common laboratory consumable in microscopy observation. It is usually used to cover the slide to ensure that the sample is observed more clearly under the microscope.The coverslip microscope has good transparency and chemical stability, and is suitable for cytology, microbiology, histology, etc.
Coverslips for sale: 18*18, 20*20, 22*22, 24*24, 24*32, 24*50, 24*60.
MOQ: 1 CARTON.
Feature of Coverslips for Microscope
- Transparent
Thin glass slips are made of highly transparent glass to ensure that light can penetrate through the sample and clearly illuminate the sample for observation of microstructures.
- Thin
Coverslip biology is usually very thin to ensure that the sample is at the optimal focal plane for observation and to minimize aberrations caused by translucent glass.
- Various sizes
Available in different sizes to meet different experimental needs, usually can be used with slides for microscope,slide box culture dishes.
- Flat
The surface is very flat to ensure that the observation will not cause distortion, and easy to cover evenly on the slide.
- Stable
It is highly chemically stable and resistant to dyes, solvents and other chemicals that may be used in sample preparation, ensuring that experiments are carried out effectively.
What is the function of a coverslip?
- Cover the sample on the slide to provide a clear and flat surface for microscopic observation.
- Prevent the sample from losing water and drying out during the observation under the microscope, which helps to protect the authenticity of the sample.
- Used to protect the sample from environmental pollution and oxidation, to ensure the accuracy and validity of the observation results.
Polished Coverslips for Sale
| Cat No. | Specification | Package | Weight(KG) | Size(CM) |
| GBP-18×18 | 18×18 | 100pcs/box, 10 boxes/aluminumbag, 50 aluminum bags/carton | 9.5 | 33×20×28 |
| GBP-20×20 | 20×20 | 100pcs/box, 10 boxes/aluminumbag, 50 aluminum bags/carton | 11 | 33×20×28 |
| GBP-22×22 | 22×22 | 100pcs/box, 10 boxes/aluminumbag, 50 aluminum bags/carton | 12.5 | 37×20×28 |
| GBP-24×24 | 24×24 | 100pcs/box, 10 boxes/aluminumbag, 50 aluminum bags/carton | 14 | 37×20×28 |
| GBP-24×32 | 24×32 | 100pcs/box, 10 boxes/aluminumbag, 50 aluminum bags/carton | 19 | 47×20×28 |
| GBP-24×50 | 24×50 | 100pcs/box, 10 boxes/aluminumbag, 50 aluminum bags/carton | 17 | 41×20×28 |
| GBP-24×60 | 24×60 | 100pcs/box, 10 boxes/aluminumbag, 50 aluminum bags/carton | 20 | 47×20×28 |
FAQ of Coverslips with Polished Edges
How to use the microscope coverslip?
- Gently pick up the cover glass slip with tweezers, tilt it at a 45° angle to cover it slowly so that one side of it touches the slide first, and then flatten it slowly to prevent air bubbles under it.
- Gently press the microscope cover slip with scientific filter paper to help removing air bubbles.
- Wipe the surface of the slide cover glass with a cotton gauze or clean paper towel to make sure there are no stains or residues.
How to clean coverslips for cell culture？
- Clean the glass cover with sterile alcohol or deionized water to remove any dust or impurities on the surface.
- If you have stained samples, use an appropriate cleaning solvent to avoid damaging the sample.
How to put cover slip microscope without bubbles?
1. Prepare the Slide
- Add Mounting Medium: Place a small drop of mounting medium (e.g., Canada balsam, glycerol, or synthetic resin) on the slide over the specimen. Use just enough to cover the specimen area—too much can cause overflow and too little may introduce air bubbles.
- Even Spread: Try to ensure the mounting medium is evenly spread over the specimen before applying the slip.
2. Angle the cover slip
- Hold at an Angle: Hold the slip at a 45-degree angle above the mounting medium, with one edge just touching the drop. The angled approach allows air to escape as the coverslip is lowered.
- Slowly Lower: Slowly and gently lower the slip onto the slide. This gradual lowering helps spread the mounting medium evenly, allowing bubbles to escape before they become trapped.
3. Apply Gentle Pressure
- Apply Gentle, Even Pressure: If any small bubbles remain, use a wooden applicator stick, tweezers, or a soft cloth to gently press on the glass slip. Start from one end of the coverslip and move toward the other end to push bubbles toward the edges.
4. Allow the Slide to Settle
- Wait for Settling: After the slip is in place, allow the coverglass to sit for a minute or two to let any remaining small bubbles rise to the edges, where they can escape.
- Avoid Disturbance: Handle the glass slide and cover slide carefully to avoid jarring or moving the coverslip microscope until the mounting medium is set.
5. Use Anti-Bubble Mounting Medium (Optional)
- Special Medium: Some mounting media are designed to reduce or prevent air bubbles. If air bubbles remain a persistent issue, consider trying one of these.
What is the difference between microscope slides and cover slips?
Polished coverslips for microscope: thinner, usually used to cover the sample and protect it from external interference.
Slide: thicker, used to hold the sample, and is the basis of microscopic observation. Cover glass and slide are usually used together, slide is used to fix the sample, and cover glass is used to protect the sample.
How to put a coverslip on a microscope slide？
Prepare the Slide
Place a clean microscope slide on a flat surface.
Add a small drop of water or mounting medium over the sample if needed (for wet mounts).
Hold the Coverslip Properly
Use clean fingers or forceps to hold the coverslip by its edges to avoid fingerprints or smudges.
Angle the Coverslip
Position the coverslip at a 45-degree angle to the slide, with one edge touching the liquid drop or sample area.
Lower Gently
Slowly and gently lower the coverslip onto the slide. This angled approach helps minimize air bubbles.
Remove Excess Liquid
If liquid seeps out from under the coverslip, gently blot the edges with absorbent paper without disturbing the sample.
Examine Under the Microscope
Once secured, the slide is ready for observation. Handle it carefully to avoid shifting the coverslip.
Can you reuse coverslips？
When Coverslips Can Be Reused
Can be reused after proper cleaning and sterilization.
They are often soaked in detergent, rinsed with distilled water, and sterilized (e.g., autoclaving or ethanol treatment) for microbiology or cell culture applications.
Reuse is common in research labs where cost-saving and sustainability are important.
When Coverslips Should NOT Be Reused
Disposable plastic coverslips are intended for single use only and may warp or degrade during cleaning or sterilization.
If the coverslip is scratched, cracked, or contaminated with hazardous biological or chemical materials, it should be discarded safely.
In clinical or diagnostic labs (especially with patient samples), coverslips are not reused to prevent cross-contamination and maintain compliance with biosafety standards.
