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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.
MULTIPLE SIZES OF PEPTIDE VIAL CAPS Keep small and large peptide vial caps together in one practical set. The 15-piece assortment includes 10 small vial caps and 5 large vial covers, giving mixed vial collections more of the larger size commonly needed...
13.5MM SMALL CAPS + 20.4MM LARGE VIAL CAPS Some 1ml, 2ml and 3ml vials use a 13.5mm/0.53in metal seal, while some 5ml, 10ml and 30ml vials use a 20.4mm/0.8in metal seal. Measure across the widest outside edge of the existing aluminum seal—not the rubber...
COLOR-CODE YOUR VIAL STORAGE Ten assorted colors make similar-looking vials easier to identify at a glance. Organize different vial groups, separate storage categories and locate the vial you need faster inside a peptide case, vial box or fridge...
REUSABLE SILICONE VIAL LIDS AND TOPPERS Flexible silicone stretches over compatible metal vial tops for convenient placement and removal. Use them repeatedly as peptide lids, vial toppers, vial cap covers and protective outer covers during everyday...
MADE FOR PEPTIDE STORAGE SETUPS Complete a peptide storage case, fridge case, vial storage box or lab supplies organizer with color-coded caps for compatible small and large vial tops. Package includes 15 silicone vial covers only; glass vials, cases...
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...
Leak-Proof Silicone Protection: Custom-designed for standard 3ml glass vials, these premium silicone caps provide a secure, leak-proof seal. They effectively block out dust and moisture, helping to maintain the quality of your liquids, peptides, and...
35-Pack with 7 Vibrant Colors: This upgraded set includes 35 reusable vial covers in 7 distinct colors (Red, Yellow, Blue, Green, Black, White, and Purple). Easily color-code your glass bottles by date or ingredient for quick identification in your...
Reusable & Easy to Clean: Crafted from highly durable and stable silicone, these protective caps withstand repeated washing and high-temperature environments without tearing or deforming. They maintain their excellent shape and offer long-lasting...
Convenient One-Handed Operation: Engineered for hassle-free use, these flexible lids snap onto your 1ml, 2ml, or 3ml vials with a simple push. The design allows for quick one-handed opening and closing, making your daily routine, mixing tasks, or liquid...
Versatile Storage Accessories: Perfectly compatible with standard glass ampoules, these protective covers are essential accessories for your daily travel kit, home cabinet, or hobby studio. Ideal for securely organizing reagents, cosmetic liquids...
PEPTIDE CAPS FOR VIALS — COLOR-CODE AT A GLANCE Eight distinct colors make compatible vials easier to identify without checking every label. Turn a row of similar-looking vials into a clean, easy-to-read setup.
A BETTER-LOOKING PEPTIDE STORAGE SETUP Keep compatible vials easy to spot in a peptide case, vial box, fridge case or organizer. These bright vial lids and vial toppers bring color and order to everyday vial storage.
MADE FOR 13.5MM METAL CRIMP TOPS Designed for select 1ml, 2ml and 3ml glass vials with an existing metal or aluminum crimp cap measuring approximately 13.5mm / 0.53in across. For the best match, use the cap measurement rather than vial capacity.
FLEXIBLE SILICONE, MADE TO REUSE Soft silicone vial covers slip over compatible metal tops and are easy to remove and reuse. A simple, colorful upgrade for peptide accessories, storage supplies and vial organization.
MEASURE ONCE, ORDER WITH CONFIDENCE Measure the widest outside part of the existing metal crimp cap from edge to edge. Do not measure the rubber center, glass neck or vial body. Package includes 8 assorted-color caps only; vials are not included.
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...
Rich Quantity: you will receive 500 pieces 21 inches hair nets for women food service, which can effectively help your hair keep clean; The rich quantity gives you more alternatives and using freedom
Quality Material: these 21 inches hair covers for work are crafted from non woven fabric; The material boasts a lightweight nature ensuring comfort to the user; The breathable texture not only shields your hair effectively but also keeps you comfortable...
Elastic Band Design: the hair nets for women come with an elastic band designed to provide a snug fit for most head sizes; The band prevents the cap from slipping or falling off, thereby maintaining an ongoing workflow; It gives the users a reliable and...
Unisex Use: regardless of gender, these disposable bouffant caps are designed to serve everyone; They fit men and women alike, as they are designed for universal use; By encompassing different hair lengths and volumes, these caps provide inclusive...
Versatile Applications: the disposable hair nets aren't just for occupational needs; They have a diverse range of applications; They are ideal for protecting your hair during household chores, DIY projects, gardening works, and more
Advantage:The cover is smooth and burr-free after opening, and the cotton will not get caught .
Aluminum plastic caps are suitable for oral liquid bottles, original solution bottles, essential oil bottles, freeze dried bottles, etc.
Instruction : The flip off seal can withstand high temperatures. This cover is fully tear-off, and when you tear off its plastic cover, the aluminum cover becomes unusable.
NOTE: Our store has flip off caps of different styles, sizes and colors to choose from.
[Moisture Wicking Sweatband] Upgraded soft sweat belt with hygroscopic perspiration treatment for quick drying. 100% high-grade polyester fabric, light, comfortable, breathable, fast drying, stay fresh while you work hard, can quickly absorb all sweat, no...
[Long Hair Working Caps] Our women's clapper caps are designed for women with long and thick hair, and the elastic pocket at the back makes it easy to put on or take off the cap, keeping your head and hair neat and clean
[Scrub Caps with Buttons] Our frosted cap button design is specifically designed to hang your preferred tightness. This work hat won't hurt your ears or wrinkle your face.
[Package Includes] You will receive 2 brush caps, they are the different pattern, you can tie your hair in the bag, or you can tie it into a ponytail, convenient and practical
[Multi-occasion Use] Each one is printed with lovely patterns, suitable for beauty salons, families and other places, so that you can concentrate on work, you can also give your colleagues, friends, neighbors, family members, such as wife, daughter...
Last update on 2026-08-31 / 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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