Cover Glass

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Cover Glass (coverslips) are thin, transparent glass or plastic squares (e.g., 18×18 mm, 22×22 mm) or rectangles (22×30 mm, 24×50 mm) used to cover specimens on microscope slides for microscopic examination. Available in thickness No. 1 (0.13-0.16 mm) and No. 1.5 (0.16-0.19 mm) for optimal microscopy. Made from optical glass with high light transmission (>90%), refractive index 1.52 matching immersion oil. Packaged in boxes of 100-1000, interleaved with paper to prevent scratching. Primary clinical applications include covering blood films for manual differential counts and malaria diagnosis, wet mount preparations of urine sediment and vaginal secretions, histopathology and cytology slides, Gram-stained bacterial smears, semen analysis, KOH preparations for fungal elements, and India ink preparations for Cryptococcus. Critical safety precautions include handling with forceps (sharp edges), disposing of broken coverslips in sharps containers, avoiding fingerprints on optical surface, and proper disposal of biohazard-contaminated coverslips. Essential consumable in every clinical laboratory performing microscopy.

Categories: LABORATORY EQUIPMENT AND SUPPLIES, CONSUMABLES AND DISPOSABLES, Lab Consumables Tags: Cover Glass, Cover Slip, Coverslip, Glass Coverslip, Lab Consumables, Microscope Cover Glass, Microscopy Supplies

Description

Cover Glass

PRIMARY CLINICAL & DIAGNOSTIC USES

1. Microscopic Examination of Blood Films:

Primary Use: Cover glasses are essential for preparing blood smears for manual differential counts, malaria diagnosis, and evaluation of red blood cell morphology, providing a flat, uniform surface for optimal microscopic visualization.
How it helps: Creates a perfect viewing window that protects both the specimen and the microscope lens, allowing pathologists and laboratory professionals to see blood cells with crystal clarity and make accurate diagnoses of conditions ranging from anemia to leukemia.

2. Wet Mount Preparations:

Primary Use: Used to cover wet mounts of urine sediment, vaginal secretions, stool specimens, and other body fluids, allowing microscopic examination for cells, crystals, microorganisms, and parasites while preventing dehydration and lens contact.
How it helps: Preserves liquid specimens long enough for thorough examination, giving laboratory professionals time to identify infection-causing organisms, crystals that form kidney stones, or abnormal cells that signal disease.

3. Histopathology and Cytology Slides:

Primary Use: Applied over tissue sections mounted on glass slides for permanent preservation and microscopic examination in histopathology and cytology laboratories.
How it helps: Protects priceless tissue samples—sometimes the only evidence of cancer or other diseases—allowing them to be preserved for years and re-examined whenever needed for diagnosis, second opinions, or research.

4. Gram Stain and Other Stained Preparations:

Primary Use: Cover glasses protect stained bacterial smears and other stained preparations, preserving the specimen and enabling oil immersion microscopy without damaging the lens.
How it helps: Allows microbiologists to use high-powered oil immersion lenses safely, revealing the shape, size, and staining characteristics of bacteria that are essential for identifying the specific organism causing an infection.

5. Semen Analysis:

Primary Use: Used in preparing wet mounts for sperm count and motility assessment in fertility evaluations.
How it helps: Creates a stable viewing platform for analyzing sperm movement and concentration, providing couples struggling with infertility the critical information they need to understand their options and plan their path to parenthood.

6. KOH Preparations for Fungal Elements:

Primary Use: Cover glasses are used in potassium hydroxide (KOH) preparations for microscopic detection of fungal elements in skin, nail, and hair specimens.
How it helps: Holds the KOH solution in place while it dissolves surrounding cells, allowing the distinctive structures of fungi to become visible and helping doctors diagnose stubborn fungal infections of the skin and nails.

7. India Ink Preparations for Cryptococcus:

Primary Use: Applied over India ink preparations of CSF to detect encapsulated Cryptococcus neoformans in suspected meningitis cases.
How it helps: Creates the perfect contrast to reveal the distinctive halos around Cryptococcus fungi in spinal fluid, enabling rapid diagnosis of a life-threatening meningitis and allowing treatment to begin immediately.

SECONDARY & SUPPORTIVE USES

1. Educational and Teaching Laboratories: Essential for preparing teaching slides in medical, nursing, and laboratory science education, helping train the next generation of healthcare professionals to recognize the cellular signatures of disease.

2. Research Applications: Used in various research settings for microscopic examination of cells, tissues, and microorganisms, supporting scientific discovery and medical advances.

3. Quality Control in Laboratory Testing: Used in preparing control slides for staining procedures and microscope calibration, ensuring that laboratory results are accurate and reliable.

4. Cytogenetics and Fluorescence In Situ Hybridization (FISH): Specialized cover glasses used in advanced cytogenetic techniques, helping identify genetic abnormalities that cause cancer and developmental disorders.

5. Immunohistochemistry (IHC): Used to cover stained tissue sections for diagnostic and research immunohistochemistry, enabling pathologists to see exactly which proteins cancer cells are producing.

6. Telemedicine and Digital Pathology: Specimens are often coverslipped before scanning for digital pathology applications, allowing expert pathologists to review cases from anywhere in the world.

7. Forensic Science: Used in preparing evidence slides for microscopic examination in forensic laboratories, helping solve crimes and bring justice to victims and their families.

KEY PRODUCT FEATURES

1. BASIC IDENTIFICATION ATTRIBUTES

Product Type: Thin, transparent glass or plastic squares or rectangles used to cover specimens on microscope slides.
Common Names: Cover Glass, Coverslip, Microscope Cover Glass, Cover Slip, Glass Coverslip.
Dimensions (Standard Sizes):
- Square: 18 mm × 18 mm, 20 mm × 20 mm, 22 mm × 22 mm, 24 mm × 24 mm, 25 mm × 25 mm.
- Rectangular: 22 mm × 30 mm, 22 mm × 40 mm, 22 mm × 50 mm, 24 mm × 50 mm, 24 mm × 60 mm.
- Circular: 12 mm, 15 mm, 18 mm, 20 mm, 22 mm, 25 mm diameter (for cell culture and specialized applications).
Thickness: No. 1 (0.13-0.16 mm), No. 1.5 (0.16-0.19 mm) - most common for microscopy, No. 2 (0.19-0.23 mm).
Material: Optical glass (most common), borosilicate glass, or plastic (polystyrene, acrylic).
Edge Type: Cut edges (standard), ground edges (smooth, less likely to damage fingers), polished edges (for cell culture).

2. TECHNICAL & PERFORMANCE PROPERTIES

Optical Clarity: High light transmission (>90%) for clear microscopic visualization.
Refractive Index: 1.52 (matching immersion oil and glass slides for optimal optics).
Flatness: Precision-ground for uniform thickness and minimal optical distortion.
Chemical Resistance: Resistant to common laboratory chemicals (alcohols, xylene, acetone).
Autofluorescence: Low autofluorescence for fluorescence microscopy applications.
Thickness Tolerance: ±0.01 mm for precision applications.
Breakage Resistance: Annealed glass reduces internal stress; plastic coverslips unbreakable but may scratch.
Sterility: Non-sterile (standard) or sterile (for cell culture and surgical pathology).
Pre-cleaned: Many are pre-cleaned and ready to use; some require cleaning before use.

3. PHYSICAL & OPERATIONAL PROPERTIES

Packaging:
- Boxes: 100-1000 coverslips per box (interleaved with paper to prevent scratching).
- Plastic Dispensers: Convenient dispensing boxes for easy access.
- Individual Wrapping: Sterile coverslips individually wrapped.
Color: Clear (most common); colored coverslips available for special applications.
Surface: Clean, free of oil, dust, and scratches.
Handling: Requires forceps for handling to avoid fingerprints and breakage.
Storage: Store in original packaging at room temperature; protect from dust and moisture.

4. SAFETY & COMPLIANCE ATTRIBUTES

Regulatory Status: Class I medical device (for diagnostic use); generally exempt from pre-market notification.
Biocompatibility: Glass is biologically inert; plastic coverslips must meet biocompatibility standards.
Sharp Edges: Cut edges may be sharp; handle with care to avoid cuts.
Breakage: Glass coverslips can break, creating sharp fragments; dispose in sharps containers.
Latex-Free: All components latex-free.
RoHS Compliance: Compliant with Restriction of Hazardous Substances directive.
CE Mark: May be CE marked for IVD use.

5. STORAGE & HANDLING ATTRIBUTES

Storage: Store in original packaging at room temperature; protect from dust, moisture, and breakage.
Handling: Use forceps to handle coverslips; avoid touching with fingers (oils and debris affect microscopy).
Cleaning: Pre-cleaned coverslips are ready to use; if additional cleaning is needed, use lint-free lens tissue and alcohol.
Dispensing: Remove from box carefully to avoid scratching or breaking.
Disposal: Discard broken coverslips in sharps container; intact used coverslips may be disposed of as biohazard waste (if contaminated with biological material).
Expiration: No expiration if stored properly; sterile coverslips have expiration dates.

6. LABORATORY & CLINICAL APPLICATIONS

Primary Application: Covering specimens on microscope slides to protect the specimen, prevent dehydration, and enable optimal microscopic examination.
Application Techniques:
- Manual Placement: Using forceps to lower coverslip at an angle to avoid air bubbles.
- Automated Coverslipping: Used in high-volume laboratories for consistency and efficiency.
- Mounting Media: Permanent or aqueous mounting media used to adhere coverslip to slide and preserve specimens.
Selection Criteria:
- Specimen Type: Blood films, wet mounts, stained smears, tissue sections.
- Magnification: Higher magnification objectives require thinner coverslips (No. 1.5).
- Immersion Oil: Oil immersion objectives require coverslip thickness within specified range.
- Automation: Automated slide processors may require specific coverslip dimensions.
Limitations: Glass coverslips are fragile and may break; plastic coverslips may scratch and have different optical properties.

SAFETY HANDLING PRECAUTIONS

1. SAFETY PRECAUTIONS

Cut Hazard: Cover glass edges can be sharp; handle with forceps; never handle with bare fingers.
Breakage: If coverslip breaks, carefully remove fragments with forceps; dispose in a sharps container; do not use vacuum (creates aerosol).
Biohazard: Used coverslips contaminated with blood, body fluids, or microorganisms are biohazardous; dispose appropriately.
Fingerprints: Avoid touching coverslip surface; oils and debris interfere with microscopy.
Cleaning: If cleaning required, use lint-free lens tissue and appropriate solvent; avoid scratching.
Dispensing: Remove coverslips carefully to avoid breaking multiple coverslips.
Storage: Keep boxes closed when not in use to prevent dust accumulation.

2. FIRST AID MEASURES

Cut from Broken Cover Glass: Wash wound with soap and water; apply antiseptic and bandage; seek medical attention if deep or if contaminated with biological material.
Eye Contact with Glass Dust: Flush eyes with copious water for 15 minutes; seek medical attention.
Broken Glass in Laboratory Area: Use brush and dustpan to collect fragments; dispose in sharps container; do not use hands.

3. FIRE FIGHTING MEASURES

Flammability: Glass is non-combustible; plastic coverslips are combustible.
Extinguishing Media: Use water, foam, CO₂, or dry chemical as appropriate for surrounding fire.

Cover Glass

Cover Glass

PRIMARY CLINICAL & DIAGNOSTIC USES

1. Microscopic Examination of Blood Films:

Primary Use: Cover glasses are essential for preparing blood smears for manual differential counts, malaria diagnosis, and evaluation of red blood cell morphology, providing a flat, uniform surface for optimal microscopic visualization.

How it helps: Creates a perfect viewing window that protects both the specimen and the microscope lens, allowing pathologists and laboratory professionals to see blood cells with crystal clarity and make accurate diagnoses of conditions ranging from anemia to leukemia.

2. Wet Mount Preparations:

Primary Use: Used to cover wet mounts of urine sediment, vaginal secretions, stool specimens, and other body fluids, allowing microscopic examination for cells, crystals, microorganisms, and parasites while preventing dehydration and lens contact.

How it helps: Preserves liquid specimens long enough for thorough examination, giving laboratory professionals time to identify infection-causing organisms, crystals that form kidney stones, or abnormal cells that signal disease.

3. Histopathology and Cytology Slides:

Primary Use: Applied over tissue sections mounted on glass slides for permanent preservation and microscopic examination in histopathology and cytology laboratories.

How it helps: Protects priceless tissue samples—sometimes the only evidence of cancer or other diseases—allowing them to be preserved for years and re-examined whenever needed for diagnosis, second opinions, or research.

4. Gram Stain and Other Stained Preparations:

Primary Use: Cover glasses protect stained bacterial smears and other stained preparations, preserving the specimen and enabling oil immersion microscopy without damaging the lens.

How it helps: Allows microbiologists to use high-powered oil immersion lenses safely, revealing the shape, size, and staining characteristics of bacteria that are essential for identifying the specific organism causing an infection.

5. Semen Analysis:

Primary Use: Used in preparing wet mounts for sperm count and motility assessment in fertility evaluations.

How it helps: Creates a stable viewing platform for analyzing sperm movement and concentration, providing couples struggling with infertility the critical information they need to understand their options and plan their path to parenthood.

6. KOH Preparations for Fungal Elements:

Primary Use: Cover glasses are used in potassium hydroxide (KOH) preparations for microscopic detection of fungal elements in skin, nail, and hair specimens.

How it helps: Holds the KOH solution in place while it dissolves surrounding cells, allowing the distinctive structures of fungi to become visible and helping doctors diagnose stubborn fungal infections of the skin and nails.

7. India Ink Preparations for Cryptococcus:

Primary Use: Applied over India ink preparations of CSF to detect encapsulated Cryptococcus neoformans in suspected meningitis cases.

How it helps: Creates the perfect contrast to reveal the distinctive halos around Cryptococcus fungi in spinal fluid, enabling rapid diagnosis of a life-threatening meningitis and allowing treatment to begin immediately.

SECONDARY & SUPPORTIVE USES

1. Educational and Teaching Laboratories: Essential for preparing teaching slides in medical, nursing, and laboratory science education, helping train the next generation of healthcare professionals to recognize the cellular signatures of disease.

2. Research Applications: Used in various research settings for microscopic examination of cells, tissues, and microorganisms, supporting scientific discovery and medical advances.

3. Quality Control in Laboratory Testing: Used in preparing control slides for staining procedures and microscope calibration, ensuring that laboratory results are accurate and reliable.

4. Cytogenetics and Fluorescence In Situ Hybridization (FISH): Specialized cover glasses used in advanced cytogenetic techniques, helping identify genetic abnormalities that cause cancer and developmental disorders.

5. Immunohistochemistry (IHC): Used to cover stained tissue sections for diagnostic and research immunohistochemistry, enabling pathologists to see exactly which proteins cancer cells are producing.

6. Telemedicine and Digital Pathology: Specimens are often coverslipped before scanning for digital pathology applications, allowing expert pathologists to review cases from anywhere in the world.

7. Forensic Science: Used in preparing evidence slides for microscopic examination in forensic laboratories, helping solve crimes and bring justice to victims and their families.

1. BASIC IDENTIFICATION ATTRIBUTES

Product Type: Thin, transparent glass or plastic squares or rectangles used to cover specimens on microscope slides.

Common Names: Cover Glass, Coverslip, Microscope Cover Glass, Cover Slip, Glass Coverslip.

Dimensions (Standard Sizes):

Square: 18 mm × 18 mm, 20 mm × 20 mm, 22 mm × 22 mm, 24 mm × 24 mm, 25 mm × 25 mm.

Rectangular: 22 mm × 30 mm, 22 mm × 40 mm, 22 mm × 50 mm, 24 mm × 50 mm, 24 mm × 60 mm.

Circular: 12 mm, 15 mm, 18 mm, 20 mm, 22 mm, 25 mm diameter (for cell culture and specialized applications).

Thickness: No. 1 (0.13-0.16 mm), No. 1.5 (0.16-0.19 mm) - most common for microscopy, No. 2 (0.19-0.23 mm).

Material: Optical glass (most common), borosilicate glass, or plastic (polystyrene, acrylic).

Edge Type: Cut edges (standard), ground edges (smooth, less likely to damage fingers), polished edges (for cell culture).

2. TECHNICAL & PERFORMANCE PROPERTIES

Optical Clarity: High light transmission (>90%) for clear microscopic visualization.

Refractive Index: 1.52 (matching immersion oil and glass slides for optimal optics).

Flatness: Precision-ground for uniform thickness and minimal optical distortion.

Chemical Resistance: Resistant to common laboratory chemicals (alcohols, xylene, acetone).

Autofluorescence: Low autofluorescence for fluorescence microscopy applications.

Thickness Tolerance: ±0.01 mm for precision applications.

Breakage Resistance: Annealed glass reduces internal stress; plastic coverslips unbreakable but may scratch.

Sterility: Non-sterile (standard) or sterile (for cell culture and surgical pathology).

Pre-cleaned: Many are pre-cleaned and ready to use; some require cleaning before use.

3. PHYSICAL & OPERATIONAL PROPERTIES

Packaging:

Boxes: 100-1000 coverslips per box (interleaved with paper to prevent scratching).

Plastic Dispensers: Convenient dispensing boxes for easy access.

Individual Wrapping: Sterile coverslips individually wrapped.

Color: Clear (most common); colored coverslips available for special applications.

Surface: Clean, free of oil, dust, and scratches.

Handling: Requires forceps for handling to avoid fingerprints and breakage.

Storage: Store in original packaging at room temperature; protect from dust and moisture.

4. SAFETY & COMPLIANCE ATTRIBUTES

Regulatory Status: Class I medical device (for diagnostic use); generally exempt from pre-market notification.

Biocompatibility: Glass is biologically inert; plastic coverslips must meet biocompatibility standards.

Sharp Edges: Cut edges may be sharp; handle with care to avoid cuts.

Breakage: Glass coverslips can break, creating sharp fragments; dispose in sharps containers.

Latex-Free: All components latex-free.

RoHS Compliance: Compliant with Restriction of Hazardous Substances directive.

CE Mark: May be CE marked for IVD use.

5. STORAGE & HANDLING ATTRIBUTES

Storage: Store in original packaging at room temperature; protect from dust, moisture, and breakage.

Handling: Use forceps to handle coverslips; avoid touching with fingers (oils and debris affect microscopy).

Cleaning: Pre-cleaned coverslips are ready to use; if additional cleaning is needed, use lint-free lens tissue and alcohol.

Dispensing: Remove from box carefully to avoid scratching or breaking.

Disposal: Discard broken coverslips in sharps container; intact used coverslips may be disposed of as biohazard waste (if contaminated with biological material).

Expiration: No expiration if stored properly; sterile coverslips have expiration dates.

6. LABORATORY & CLINICAL APPLICATIONS

Primary Application: Covering specimens on microscope slides to protect the specimen, prevent dehydration, and enable optimal microscopic examination.

Application Techniques:

Manual Placement: Using forceps to lower coverslip at an angle to avoid air bubbles.