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Labware caps are essential for maintaining sample integrity, preventing contamination, and ensuring safe storage and transportation of chemicals and biological materials. Selecting the appropriate cap for your specific application is crucial for accurate experimental results and laboratory safety. This guide will help you navigate the key considerations when choosing the right labware closures.
Professional Leak-Proof Design: Made of high-quality materials and customized for 3ml glass ampoules and vials, it provides double leak-proof protection, effectively isolates moisture and contaminants, significantly extending the shelf life of reagents...
Efficient Color Classification and Management: 8 color schemes are available (purple, white, orange, blue, red, yellow, green, and black), each with its own unique characteristics. This allows for visual coding by date, ingredient, and priority...
Reusable and Easy to Clean：Using high-quality, chemically stable and corrosion-resistant materials, it withstands high-temperature cleaning and repeated use, resists aging and deformation, and ensures excellent sealing and hygienic performance over...
Convenient Operation and Easy Maintenance：Securely installs with a single click and allows for one-handed opening, making it suitable for frequent use. It can be washed and air-dried after use, simplifying maintenance and saving time and effort
Wide Compatibility and Multi-Scenario Applications：Perfectly compatible with 3ml ampoules and vials, it's suitable for storing and managing a variety of media, including reagents, model paints, cosmetic liquids, and pharmaceuticals. It meets the diverse...
✅ SECURE LEAK PROOF AND DUST PROOF SEAL——Features a snug-fitting design that creates an airtight seal, effectively protecting your valuable liquids from evaporation and contamination. This significantly extends the shelf life of reagents, peptides...
🎨 EFFORTLESS 6-COLOR CODING SYSTEM——Includes 12 caps in 6 vibrant colors (2 of each) for instant visual organization. Perfect for coding by content, date, user, or priority—ideal as a weekly supplement schedule or for project management. This...
♻️ REUSABLE, DURABLE & EASY TO MAINTAIN——Crafted from high-quality, chemically stable silicone that withstands repeated use and resists aging. Simply rinse with water and air-dry for easy cleaning, making these caps an economical and eco-friendly...
🔬 WIDE COMPATIBILITY FOR MULTIPURPOSE USE——Perfectly fits standard 1ml, 2ml, and 3ml glass vials (including injection vials). Ideal for a variety of applications including laboratory reagents, model paints, cosmetic liquids, and pharmaceuticals...
👍 CONVENIENT ONE-HANDED OPERATION——Designed for ease of use, these caps securely snap on with a single press and are easy to remove, even with one hand. This user-friendly design simplifies frequent access and streamlines your workflow, saving you...
Professional Leak-Proof Design: Made of high-quality materials and customized for 3ml glass ampoules and vials, it provides double leak-proof protection, effectively isolates moisture and contaminants, significantly extending the shelf life of reagents...
Efficient Color Classification and Management: 8 color schemes are available (purple, white, orange, blue, red, yellow, green, and black), each with its own unique characteristics. This allows for visual coding by date, ingredient, and priority...
Reusable and Easy to Clean：Using high-quality, chemically stable and corrosion-resistant materials, it withstands high-temperature cleaning and repeated use, resists aging and deformation, and ensures excellent sealing and hygienic performance over...
Convenient Operation and Easy Maintenance：Securely installs with a single click and allows for one-handed opening, making it suitable for frequent use. It can be washed and air-dried after use, simplifying maintenance and saving time and effort
Wide Compatibility and Multi-Scenario Applications：Perfectly compatible with 3ml ampoules and vials, it's suitable for storing and managing a variety of media, including reagents, model paints, cosmetic liquids, and pharmaceuticals. It meets the diverse...
Package Including: You will receive 25Pcs Black Phenolic Screw Caps. Size: inner diameter: 22mm/0.86inch, outer diameter: 25mm/0.98inch, height: 12mm/0.47inch.
Leak Resistant Polycone Seal: Designed with an integrated polycone liner that helps create a tight seal, supporting spill prevention and reliable storage for liquids used in chemicals, cosmetics, and daily solutions.
Premium Phenolic Construction: Made from strong phenolic material that resists cracking, warping, supporting long term use without deformation or unwanted odors.
Secure Screw On Closure: Smooth internal threads allow consistent tightening, helping the cap stay firmly in place during handling, transport, or repeated opening and closing.
Wide Bottle Compatibility: Designed for Boston round style bottles commonly used for cosmetics, crafts, and general storage, offering a practical and dependable closure solution.
Product Details: You will receive sample bottle caps suitable for 2ml/3ml/4ml, and sample bottle caps suitable for 5ml/10ml/30ml/5-100ml. A total of 20 sample bottle caps are available in 10 colors to meet your storage protection and sorting needs...
Reusable and Easy to Clean: Made of high-quality, chemically stable and corrosion-resistant materials, it can withstand high-temperature cleaning and repeated use, resist aging and deformation, and ensure excellent sealing and hygiene performance in...
Leak-Proof Design: Specially customized for 2ml / 3ml / 4ml / 5ml / 10ml / 30ml / 1-100ml glass ampoules and vials, it provides double leak-proof protection, effectively isolates moisture and contaminants, significantly extends the shelf life of reagents...
10-Color Classification and Management: 10 color schemes are available (purple, white, orange, blue, Pink, gray，red, yellow, green and black), each with its own unique characteristics. This allows for visual coding by date, ingredient and priority...
Suitable for Various Scenarios: Perfectly compatible with 3ml ampoules and vials, suitable for storing and managing various media, including reagents, model pigments, cosmetics and medicines. It meets various needs such as laboratory research, medical...
Professional Leak-Proof Design: Made of high-quality materials and customized for 3ml glass ampoules and vials, it provides double leak-proof protection, effectively isolates moisture and contaminants, significantly extending the shelf life of reagents...
Efficient Color Classification and Management: 8 color schemes are available (purple, white, orange, blue, red, yellow, green, and black), each with its own unique characteristics. This allows for visual coding by date, ingredient, and priority...
Reusable and Easy to Clean：Using high-quality, chemically stable and corrosion-resistant materials, it withstands high-temperature cleaning and repeated use, resists aging and deformation, and ensures excellent sealing and hygienic performance over...
Convenient Operation and Easy Maintenance：Securely installs with a single click and allows for one-handed opening, making it suitable for frequent use. It can be washed and air-dried after use, simplifying maintenance and saving time and effort
Wide Compatibility and Multi-Scenario Applications：Perfectly compatible with 3ml ampoules and vials, it's suitable for storing and managing a variety of media, including reagents, model paints, cosmetic liquids, and pharmaceuticals. It meets the diverse...
Ample Quantity -- You will get a total of 30 pcs of 5 different sizes of resin bottle caps, 6pcs/size, the sufficient quantity is enough to meet your daily use needs.
Size Information - The 6 different sizes of bottle caps are about 21mm, 23mm, 24.5mm, 27.5mm, 31.5mm in height; 12mm, 12mm, 13mm, 13mm, 13.5mm in diameter; 16.5mm, 18mm, 20mm, 22mm, 26mm in inner diameter.
Premium Quality--These squeeze bottle lids are made of high quality plastic, which is durable, not easy to break, to ensure long-term use.
Wide Application--Multifunctional bottle caps are very suitable for condiments, cleaning products and many different products. It is very suitable for seasoning, glue, paint, and modeling and crafting activities. Ideal for squeeze bottles and plastic...
Recycling--These plastic bottle caps are also easy to clean, you can also reuse them after cleaning or use them for unique crafts
LARGE 1.53" SIZE FOR EASY HANDLING:Unlike standard small caps, our bottle caps feature a larger 1.53" (39mm) diameter. This makes them easier for hands to grip, stack, and manipulate during craft time. Perfect for creating larger-scale DIY projects...
IGNITE CREATIVITY:Transform simple plastic lids into works of art! These colorful bottle tops are an excellent tool for developing fine motor skills, hand-eye coordination, and color recognition. Ideal for art classes, school STEM projects, and...
Perfect Size for Versatile Applications: Measuring approximately 1.53 by 1.53 by 0.59 inches, these bottle caps fit standard bottles and are ideal for labware, household storage, and creative DIY crafts
REUSABLE MATERIAL:Made from sturdy plastic, these lids are designed to withstand frequent use. They are to deformation and deterioration, ensuring they can be washed and reused for multiple art projects or educational games without losing their shape
BULK PACK FOR GROUPS & CLASSES:The 100-piece bulk set provides a generous supply for large groups, ensuring you never run out mid-project. Whether you are a teacher stocking up for a classroom or a parent planning a rainy-day activity, this pack has you...
Last update on 2026-07-16 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Labware Caps
Material Matters
The material of a labware cap significantly impacts its chemical resistance, temperature tolerance, and sealing capabilities.
Plastic Caps: Common plastics like polypropylene (PP) and polyethylene (PE) offer good chemical resistance for general use and are often autoclavable. PTFE-lined caps provide excellent chemical inertness, ideal for aggressive solvents.
Rubber and Silicone Caps: These offer good elasticity and sealing properties, often used for stoppers or septa. Silicone is preferred for higher temperatures and broader chemical resistance than natural rubber.
Metal Caps: Typically used for specific applications requiring high durability or extreme temperature resistance, often with liners for sealing.
Seal Type and Functionality
Consider how well the cap seals and its ease of use for your workflow.
Screw Caps: Provide a secure, airtight seal, preventing evaporation and contamination. Look for caps with liners for enhanced sealing, especially with volatile substances.
Snap Caps: Offer quick and easy sealing, suitable for applications where frequent access is needed, though they may not provide as robust a seal as screw caps.
Septa: Used for injection ports, allowing sterile sample withdrawal or introduction using a syringe.
Compatibility with Labware
Ensure the cap is designed to fit the specific neck finish or opening of your labware, whether it's a bottle, vial, tube, or flask. Mismatched caps can lead to leaks or failure to seal properly, compromising your samples. Always check neck finish standards (e.g., GL45, 13-425) to guarantee a proper fit.
Frequently Asked Questions
What is the difference between a screw cap and a snap cap?
Screw caps offer a more secure and airtight seal by threading onto the container, ideal for long-term storage and preventing evaporation. Snap caps, on the other hand, press or snap into place for quick and easy sealing, suitable for frequent access.
Are plastic caps safe for use with chemicals?
Most common plastic caps made from materials like polypropylene or polyethylene offer good resistance to a wide range of chemicals for general laboratory use. For highly corrosive or reactive substances, caps with PTFE liners are recommended for superior chemical inertness.
Can I autoclave labware caps?
Many plastic caps, particularly those made from polypropylene (PP), are designed to be autoclavable. It is essential to check the product specifications for the specific cap material and its temperature tolerance to ensure it can withstand the autoclaving process without deforming or degrading.
What does 'neck finish' mean for labware caps?
Neck finish refers to the standardized size and thread specification of the opening on a labware item like a bottle or vial. Ensuring the cap's neck finish matches the labware's is critical for achieving a secure and leak-proof seal.
When should I use a cap with a liner?
Caps with liners are recommended when a superior seal is required, especially for volatile liquids, aggressive chemicals, or when preventing contamination is paramount. Liners provide an extra layer of protection against leaks and evaporation, ensuring sample integrity.
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