EPA VOA Vials–Lab Vials Supplier

In HPLC analysis, the particle size of the chromatographic column packing is small and it is easy to be blocked by impurity particles. Therefore, samples and solvents need to be filtered in advance to remove particulate contaminants and protect the instrument. Syringe filters can be used in HPLC analysis and IC analysis to filter sample solutions, which is an important step in the sample pretreatment process. 
Non-sterile Disposable Syringe Filters typically consist of a PP housing, which is often made from materials such as polypropylene. The housing contains a filter membrane, which is usually made of materials like PTFE, PVDF, PES, MCE, NYLON, PP, CA, etc. Non-sterile Disposable Syringe Filters are available in a variety of membrane choices, which determine the size of particles or contaminants that can be effectively removed. Available in 13 mm and 25 mm diameters and 0.22 μm and 0.45 μm pore sizes. The choice of pore size depends on the specific application, with smaller pores being used to filter out smaller particles and larger pores for faster flow rates with less fine filtration.

Size: 11.6*32mm（with Write-on Spot）
Volume: 2ml Vial Diameter(mm):11.6±0.25
Vial Height(mm): 32±0.3
Mouth Diameter(mm):6.15±0.15
Quantity: 100 vials & 100 caps

Aijiren reagent bottle 500mlare perfect for storing media, solvents, and other materials. reagent bottle 500ml comes with a PP Screw cap (GL45). A colorless PP pouring ring allows for drip-free emptying, easy-to-read graduations, and capacities, marking spots for labeling.

Septa Material: PTFE/Silicone (White)
Usage: 20ml Headspace Vials
Production Capacity: 50000000PCS/Week
Specification: 100pcs/pack
Trademark:Aijiren
Origin: China

Capacity: 250 mL/8.5 oz
permanent white enamel graduations from 50 mL to 200 mL
accurate scales, easy labeling
Dimension: OD: 2.56″, Neck ID: 1.18″, Height: 5.5″
GL45 Screw Cap

Aijiren 9MM hplc vials offer the lowest ion content possible to reduce sample loss and contamination.
OEM: Available
Sample: Provided Freely
Packing: 100pcs/pk
Material: Borosilicate Glass

Screw Cap: GL45 Blue Polypropylene
Material: Borosilicate Glass
Using for storage as well as mixing and sampling
GL45 threaded cap with a drip-free pouring ring

1. Chromatography vials, the wide opening crimp cap provides a larger target area for improved autosampler needle accuracy.
2. Crimp Vials with intergrated Micro-insert are also available in clear and amber glass.
3. Kinds septa: PTFE/Silicone, PTFE/ Silicone/PTFE Septa, single slit-septa to choose.

The 1000ml Amber Reagent Bottle produced by Aijiren has many special designs. The wide mouth design is to make the pouring and adding of reagents more convenient. Aijiren’s 1000ml Amber Reagent Bottle uses extremely inert soda-lime glass, which will not react with the reagents used for detection and affect the experimental results.

Fused-insert sample vials work with both snap caps and crimp caps. These small samples fused-insert vials work with both snap caps and crimp caps. 11mm Glass Crimp Neck Vials with Fused Inserts are ideal for handling small-volume samples while delivering low residual volume. 11mm Glass Crimp Neck Vials with Fused Inserts offers the simplicity and functionality of typical micro vials at a fraction of the cost. 0.3 ml clear glass micro insert fixed in 2 ml glass vial. Bottom fixed micro insert to keep the vial central vertical. Vials with integrated Micro-Insert are also available now in clear and amber glass. amber glass makes it compatible with sun-proof samples. Their glass Micro-Insert is absolutely centered in the plastic mold and pressed firmly against the septa due to its slightly exceeding edges.

The slit allows ambient gas to equalize the gas in the vial so that a vacuum is not created in the vial from the tight seal around the needle.
If coring or clogging from a narrow needle or needle deflection from highly durable septa material is a concern, then choosing a pre-slit septum is a better choice.
A PTFE/Silicone with a slitted septum allows for easier needle penetration as well as to release of the vacuum that forms when a large volume of sample is withdrawn from a vial.

PTFE membranes are inherently hydrophobic; they are ideal for the filtration of nonpolar liquids and gases.
Very resistant to solvents as well as acids or bases.
Can be made more hydrophilic by flushing with alcohol, followed by water
Used for filtering and de-gassing chromatography solvents
Permits optimal utilization of small sample volumes
Excellent chemical compatibility for filtering harsh chemicals that destroy other membrane materials
Moisture barrier for venting applications and vacuum pump line protection
Ideal for aerosol sampling
Filter viscous organic-based HPLC samples
After pre-wetting with alcohol, may be used for fine particle removal of aqueous and mild organic solutions in Ion Chromatography

The main application for HPLC, autosampler, chromatography, Agilent, waters machine. All autosamplers of Ajiren Tech are 100% integrity tested and manufactured according to ISO 9001 standard. If a 2ml screw HPLC vialsis required. Please contact Ajiren.

ThisAmber 1000ml Reagent Bottle is made from borosilicate glass and is great for containing liquids and powders that are light sensitive. When pouring hot liquids into an Amber 1000ml Reagent Bottle or placing the bottle in the refrigerator, the lid should be propped open with a toothpick or other small object until the liquid and bottle are cool

In HPLC analysis, the particle size of the chromatographic column packing is small and it is easy to be blocked by impurity particles. Therefore, samples and solvents need to be filtered in advance to remove particulate contaminants and protect the instrument. Ion chromatography, which is commonly used in environmental analysis, also requires that no inorganic pollutants be introduced in sample pretreatment. Syringe filters can be used in HPLC analysis and IC analysis to filter sample solutions, which is an important step in the sample pretreatment process.

Aijiren 10mm hplc vial: dimensions: 11.6mm x 32mm, mouth diameter: 10mm, 425 standard threads, 2ml capacity.
Features of the related parameters of the cover cushion: septum diameter 10mm, thickness 1.5mm; cover opening diameter 7mm; cover applicable diameter 10mm, GPI standard 425 thread.

The Screw Top Vials produced by Aijiren are available in three different calibers, 8mm, 9mm and 10mm. The matching PP Screw Caps are made of high-quality polypropylene materials. If the number of samples to be tested is small, it can also be used with micro-insert. Bottles with different calibers have different matching micro-inserts.

Autosampler vial can be divided into HPLC vial and GC vial. So Autosampler vial has different volume. Especially, some sample is rare. so the micro-insert is needed. No matter which autosampler vial you need, you should confirm the chromatography instrument, firstly. You can find your needed in Aijiren and you can also tell us your requirement, our technical engineer will give anwser.

1.Material: high quality, borosilicate 3.3 glass
2.Color: Clear
3.Capacity: 100ml, 250ml, 500ml, 1000ml
4.Cap: Din thread GL45, pouring ring
5.Permanent white enamel graduations markings
For general purpose laboratory applica

9 mm Wide Mouth Vials and Closures are our recommended screw thread vials. These vials are autosampler compatible and offer a 40% larger opening than 8-425 thread vials, simplifying pipetting and other routine functions. Amber glass vials are perfect for storing samples that are sensitive to light exposure. Clear glass vials are great for testing the solubility or dispersability of materials, allowing you an unhindered view of the solution.

Aijiren screw thread top autosampler vials design is characterized by universal ease of use, especially the use of automated sample introduction systems, so this type of vial is also called an autosampler vial. And this sample vial is extremely compatible. The 1.5ml sample vial we usually say is the 2ml volume sample vial. The design of Aijiren screw thread top vials is developed in Europe and the United States, and the design feature is easy to use, especially the use of an automated sample introduction system.
Aijiren 10mm 2ml HPLC autosampler vial is generally made of high-quality imported expanded borosilicate glass tube. The high-cost performance of this material is the first choice for throughput analysis. The matching polypropylene bottle cap is chemically compatible, suitable for most chromatographic applications, and suitable for 6mm diameter micro-insert.

Disposable
Luer-Lock and pressure fitting
Ultrasonically bonded for reliability
Filter media type clearly inscribed on barrel
Excellent unit-to-unit and lot-to-lot reproducibility and consistency

Autosampler vials for HPLC are generally grouped depending on the diameter of the vial, the height of the vial, and, the thread finish. Both clear glass and amber glass are highly inert.
Sample: Provided Freely
Packing: 100pcs/pk
Material: Borosilicate Glass
Vial Height(mm): 32±0.3
Mouth Diameter(mm):6.15±0.15

Aijiren offers an extensive selection of proven, yet affordable syringe filters that are in stock and ready to ship today. Selected for their durability, material quality, and performance characteristics, our syringe filters deliver accurate, measurable results at a fraction of the cost.
Diameter: 13mm and 25mm
Pore size: 0.22um and 0.45um
Package-Type: Low dust polyethylene box
Filter Housing: Polypropylene / High-Density Polyethylene
Industry-Specific Certification: Pharmaceutical Grade

The COD Test Tube produced by Aijiren is often used for water quality testing. In order to adapt to different models and brands of machines, Aijiren has launched a multi-size COD Test Tube. The caliber is a uniform 16mm, but the sizes are 9ml, 10ml, 12ml and 15ml. The 9ml COD Test Tube has a flat bottom, the 10ml COD Test Tube has a flat bottom and a round bottom, and the 12ml and 15ml COD Test Tubes have a round bottom.

polypropylene screw micro vials can be used in most standard gas and liquid chromatography autosamplers. These lightweight, economical vials are made from durable polypropylene which has good chemical resistance. The conical interior ensures maximum retrieval of contents without the hassle of using removable inserts. Vials are available with a screw cap and traditional screw cap finish.

Vial Dimension: 12x32mm
Vial Color: Amber and Clear
Vial Volume: 1.5-2.0ml
Vial Material: Borosilicate Glass/Glass Type 1
Application: Lab consumables for analysis
Certification: ISO9001, SGS, COA
Vial Thread: Screw

In analytical laboratories, syringe filters are essential for ensuring sample integrity by removing particulates before analysis. However, filter breakthrough—where particles pass through the filter—can compromise results and damage sensitive instruments. Here are key strategies to prevent this issue:

These polypropylene caps have excellent sealing characteristics and offer good chemical resistance including acids, alcohols, alkalis, aqueous products, cosmetics, and household oils. Polypropylene Hole Caps are known for good impact strength, cost effectiveness, and pliability.

Material: Borosilicate Glass
GL45 threaded cap with a drip-free pouring ring
Borosilicate glass content: B2O3 about 12%-13% ; SiO2 over 80%
1. good thermal resistance
2. excellent chemical durability
3. high light transmission
4. high-quality pristine surface

There is a requirement for a 2ml screw cap glass vial. Contact us now! In addition, the 2 ml amber screw top bottle is made of 33 inflatable glass and can be heated at high temperatures during transparent glass (1,200 °C) during the manufacturing process.

Reagent bottles in tinted amber or red protect light-sensitive contents from UV light, visible light, and infrared radiation.
Volume: 100ml 250ml 500ml and 1000ml
Color: Amber or Clear
Payment: 100% T/T in advance
Certificate: ISO9001:2015
Brand Name: Aijiren
Sample: Free

Aijiren 10mm hplc vial features: all glass is made of material with 5.0 light transmittance, which is perfectly compatible with the instrument. 10-425 wide-mouth vial is similar to 8-425 small-neck vial, mainly used for Waters autosamplers and Japanese instruments , And the wide mouth can get a larger injection range, so this kind of bottle is often used to repeatedly clean the residual solution on the automatic injection needle.

China High Quality 9mm Short Thread Caps with Septa for 10-425 thread vial Manufacturer

The Hand Decrimper is typically designed to work with two common crimp cap sizes, which are 11mm and 20mm. These sizes correspond to the diameter of the crimp caps, indicating their compatibility with specific vial sizes. This tool is typically made of durable materials such as stainless steel or high-quality aluminum. These materials are chosen for their strength and resistance to corrosion, ensuring long-lasting performance. The decrimping features a handle, often designed with ergonomic considerations for comfortable and efficient use by laboratory personnel. The handle provides a firm grip for precise control during the decrimping process.

The butyl rubber stopper is an off-white rubber-like solid with a density of 0.92g/cm3. It is odorless, insoluble in water, and soluble in hexane and chloroform. The product also has low air permeability, good airtightness, and good resistance. Ozone resistance, chemical resistance, electrical insulation, flexibility resistance, heat aging resistance, energy absorption and other characteristics.

The B2O3 content for borosilicate glass is typically 12–13% and the SiO2 content is over 80%. High chemical durability and low thermal expansion (3.3 × 10−6 K−1) – the lowest of all commercial glasses for large-scale technical applications – make this a multitalented glass material.
1. good thermal resistance
2. excellent chemical durability
3. high light transmission
4. high-quality pristine surface

10-425 screw thread caps and vials are suitable for Agilent, AB Sciex, Brukers, Techcomp, PerkinElmer, ThermoScientifics, Shimadzu, Waters, CTC autosampler and other rotating or robotic arm samplers and autosamplers.

Vial Volume: 1.5-2.0ml
Vial Material: Borosilicate Glass/Glass Type 1
Application: Lab consumables for analysis
Certification: ISO9001, SGS, COA
Vial Thread: Screw
Cap: Plastic open/solid cap
Septa: Non-slit, Pre-Slit, PTFE/Silicone

15-425 Screw Sample Storage vials also named sample vials, are used in the package of biological agents, cosmetics, high-value chemistry and so on. Storage vials are suitable for the packaging of various pharmaceutical intermediates, high-value-added chemicals, chemical reagents, biological reagents, cosmetics, essential oils, etc. It is suitable for long-term storage and transportation for products and has excellent sealing performance. The “15-425” designation refers to the size and threading of the vial. It has a 15mm outer diameter. These vials are typically made from high-quality materials such as Borosilicate glass. 

There are screw top autosampler vial, snap Top HPLC vial and glass storage vial. All of those glass vial are often needed in laboratory. The glass vial can supply in Amber and Clear color. Borosilicate 3.3 Glass material made the Glass vial.

There are many differences between butyl and natural rubber. Butyl rubber is a synthetic elastomer known for its excellent sealing properties, chemical resistance, and flexibility. The product also has low air permeability, good airtightness, and good resistance. Ozone resistance, chemical resistance, electrical insulation, flexibility resistance, heat aging resistance, energy absorption, and other characteristics.

500ml media bottle designed to allow the use of a user-defined reagent on Autostainer Link instruments. Each single-use bottle is labeled with positive identification technology.

20ml crimp top gc headspace vials suitable for headspace analysis of volatile solids and gases. Aijiren Tech crimps top headspace vials are available in a flat or round bottom style, with clear or amber glass.

Materials of construction: pp chamber, PP plunger outer housing, borosilicate glass plunger inner storage vial, silicone septa with PTFE liner, PP cap
Vial Size: 12 x 32 mm
Pore Size: 0.22um and 0.45um
Capacity:
Unfiltered sample chamber: 500 µL
Filtered sample chamber: 330 µL

COD testing is a good better indicator of organic pollutants in industrial wastewater containing cyanides and heavy metals. For any requirements about COD Tubes, please tell me.
Product name: COD Tubes without Logo
Size: 16*100mm
Application: Water analysis
Material: Borosilicate 3.3 Glass
Melting point: -7℃
Certificate: ISO9001

The Aijiren 2ml clear screw HPLC vials Certified Vial Convenience Kit (Opening 9mm) is full lot tested in multiple ways for 15 critical parameters. Aijiren’s 2ml clear screw hplc vials for autosampler is usually divided into three types of calibers.

The 11mm snap-top caps are made of high-quality polypropylene. The caps have a roll-edge or snap-on shape. The snap-top caps provide a secure seal that minimizes evaporation even for volatile samples.

The syringe filter produced by Aijiren is often used to filter impurities in the reagents to be tested. After the impurities are filtered, the reagents can be sucked into the autosampler. If the syringe filter is not used, it may cause problems such as clogging the needle hole with impurities in the reagent.

The new 500ml media bottle fits standard laboratory bottles that have a GL 45 neck finish. It is ergonomically designed, and offers health & safety benefits to the user, and allows easy and safe transport of bottles around the laboratory or production facility.

Snap cap vials have a standard 12×32 profile compatible with 11mm snap caps or 11mm crimp closures, Microsampling vials allow for max sample extraction without separate inserts. Manufactured from clear, Type 1 Class A or amber, Type 1 Class B borosilicate glass.

2.0ml 10-425 Screw Vials ND10 can be used for GC and HPLC. Wide opening enables easy filling with viscous materials. HPLC Autosampler Vials are cleaned and packaged in a certified Class 100000 clean room according to a designed process, developed to eliminate chromatographic errors associated with vials. Critical physical dimensions are fully tested, as well as chemical cleanliness testing to ensure that trace levels of residues are not present.
Aijiren 10mm 2ml HPLC autosampler vial is generally made of high-quality imported expanded borosilicate glass tube. The high-cost performance of this material is the first choice for throughput analysis. The matching polypropylene bottle cap is chemically compatible, suitable for most chromatographic applications, and suitable for 6mm diameter micro-insert.

The most common sample containers range in size from 100ml Amber Reagent Bottle to 1000 ml.Aijiren is the leading supplier of 100ml Amber Reagent Bottle since 2007, is a reliable supplier of lab consumables.

High range, chemical oxygen demand determinations: COD Digestion Vials, High Range Chemical Oxygen Demand (COD): US EPA approved for wastewater analysis using Hach Method 8000 Method: Reactor Digestion Range: 20 -1500 mg/L COD 150/test Contains mercury. 150/test Contains mercury.

size: 16*100mm/16*90mm/16*125mm/16*150mm

Aijiren’s 2ml Screw Vial is often used to hold samples into the autosampler for testing. The samples are often chemical reagents. If impurities appear in the chemical reagents, the test results will be affected. Therefore, we will use the Syringe Filter to filter, and inject the filtered reagents into 2ml Screw Vial, and then put it into the Autosampler for testing.

No 2ml 9mm HPLC Vial is placed in inventory without passing cleanliness and performance testing for consistency resulting in a certified, 100% defect-free vial you can trust.
Vial Dimension: 12x32mm
Vial Color: Amber and Clear
Vial Volume: 1.5-2.0ml
Customization:
Customized logo(Min. Order: 300 Packs)
Customized packaging(Min. Order: 400 Packs)

PTFE membranes are inherently hydrophobic; they are ideal for the filtration of nonpolar liquids and gases.
Very resistant to solvents as well as acids or bases.
Sample: Free
Usage: Laboratory Analysis
OEM: Available

 1.5mL Clear Screw Neck vial,8-425 Thread,11.6*32mm application in liquid chromatography, Gas chromatography, and Mass spectrometry. Aijiren screw thread top sample vial design is characterized by universal ease of use, especially the use of automated sample introduction systems, so this type of vial is also called an autosampler vial. And this sample vial is extremely compatible. The 1.5ml sample vial we usually say is the 2ml volume sample vial.

Manual power crimper and decapping tool is on sale, one set is also wholesale price. There are 11mm, 13mm, 15mm, 18mm, 20mm size to be choose. Every crimper and decapping tool made by us is customized. So the size for your bottle and cap will be perfect. Available for use with a wide variety of vial closure styles and different bottle sizes. Hand glass cirmp vial Sealing Machine Crimping Tool mouth is made of the stainless steel material. It is easy to clean and rustiness.

Vial Volume: 1.5-2.0ml
Vial Material: Borosilicate Glass/Glass Type 1
Application: Lab consumables for analysis
Certification: ISO9001, SGS, COA
Vial Thread: Screw
Cap: Plastic open/solid cap
Septa: Non-slit, Pre-Slit, PTFE/Silicone

The vial has an outer diameter of 9mm and is designed especially for use with Agilent’s and other rotating or robotic arm samplers. The vial features a short thread design with threads on the neck of the vial. This design allows for a secure and reliable closure when used with compatible screw caps or septa. Caps are made of high-quality polypropylene to exact manufacturing tolerances and lined in a controlled manufacturing environment. Available cap colors include yellow, red, green, and blue. Our septa use only the highest quality PTFE and silicone to ensure proper function and can be pre-slit to ease needle penetration. Designed for single injection and/or short sample cycles, particularly for LC applications. The absence of an elastomer layer reduces the potential for contamination.

TOC vials are pre-cleansed containers made from high-quality borosilicate glass or other inert materials. They are specifically engineered to minimize contamination risks associated with traditional vials, ensuring that even trace amounts of organic impurities do not skew the TOC readings.

9mm Screw conical micro-vial for laboratory chromatography experiment, the micro-vial size is 11.6x32mm. High-quality glass vial for HPLC/GC analysis. 2ml clear glass vial with 0.3ml integrated vial, designed for valuable samples to save for testing use volume. Bottom fixed micro insert to keep the vial central vertical. Vials with integrated Micro-Insert are also available now in clear and amber glass. amber glass make it compatible with sun-proof samples. Their glass Micro-Insert is absolutely centered in the plastic mold and pressed firmly against the septa due to its slightly exceeding edges. Standard vials for GC and HPLC.

The 2mL glass screw top autosampler vial has a variety of neckwear and opening diameters to choose from. The caliber of large-caliber or wide-inner-diameter sample bottles is 40% larger than that of standard-caliber sample bottles. The large opening reduces the risk of the autosampler needle bending during sampling.

Membrane: PTFE, PVDF, PES, MCE, NYLON, PP, CA, etc. Aijiren disposable sterile syringe filter devices are designed to provide fast and efficient filtration of aqueous and organic solutionsfrom small volumes up to 100 mL.

liquid chromatography is one kind of experiment way. The 9mm screw autosampler vial is compatible with Agilent, Shimadzu, Waters, Thermo Fisher and other instrument. In your experiment, No matter what questions was happened, you can tell our techincal engineer. They will give you solutions. Welcome to inquiry.

Standard Autosampler Vial for HPLC & GC Chromatography, vials can be used for high-performance liquid chromatography and gas chromatography for reliable analysis results
Material: Glass
Color: Clear
Height (Metric): 32mm
Outside Diameter (Metric): 12mm
Patched: No
Residual Volume: <170uL Quantity: 100Pieces/Pack

Headspace vials are a kind of laboratory vials for top space analysis, with the features of high-temperature resistance and corrosion resistance. A headspace vial is used in the process of top–gas chromatography. When detecting volatile or semi-volatile mixtures with high boiling points, we need to heat them to vaporize them at the top. In this process, since the liquid samples are at the bottom, the material in the top gas can be measured without touching the liquid in the sample vial. The material of Headspace Vials is low extractable Borosilicate glass with a low expansion rate, high-temperature resistance, high strength, high hardness, high light transmittance, and high chemical stability. Headspace Vials are suitable for headspace analysis of volatile solids and gases.

The screw neck headspace sample bottle produced by Aijiren has an optional capacity of 10ml and 20ml, and the specifications are: 22.5 * 46mm, 22.5 * 75.5mm. The 20ml GC analysis headspace sample bottle series strictly control the glass density of the bottle mouth to improve the sealing performance and prevent breakage. The precise molding bottleneck improves the processing capacity of the autosampler.

polypropylene snap/crimp micro vials combine the robustness of TPX PMP with the benefits of PP micro inserts.PP vial material was used for Ion analysis to avoid contamination by glass HPLC vials during analysis. polypropylene snap/crimp micro vials can be used in most standard gas and liquid chromatography autosamplers. These lightweight, economical vials are made from durable polypropylene which has good chemical resistance. Breakage is not an issue with plastic vials, and they are non-reactive with most sample chemistries. PP vials are ideal for samples where glass is not appropriate; as with samples that adhere to glass.

Screw caps form an excellent seal and mechanically hold the septum in place during piercing. No tools are required for assembly. The Screw Caps that are inlcuded with this kit are knurled on the sides for excellent gripping and comfort when applyting to the vial.

Item: Micro Insert for 9mm Autosampler Vial
Volume: 0.15-0.3ml
Color: Transparent
OEM: Available
Sample: Free
Certification: ISO9001:2015
Packing: 100pcs/pk
Brand Name: Aijiren
Place of Origin: China (Mainland)
Compatibility: 9mm HPLC Vials

The filter construction facilitates exceptional loading capacity with fast flow rates. This prevents the build-up of back pressure typically caused by the blocking of an unprotected membrane.
Membrane material: Nylon
Housing: Polypropylene(PP) housing
Connectors: Inlet: Female Luer
Outlet: male slip Luer
Maximum Operating Temperature:60 ℃
Pack: 100 units/pack

These septa are designed to work on most HPLC screw vials. Screw HPLC Vials offer the convenience of screw thread vials for vials that were originally designed for screw-top vials. They are available in both clear and amber glass.

Clear Reagent Bottle with GL45 Screw Cap (Royal Blue) is made of Super Thick Borosilicate Glass for Durability Graduated 500ml bottle.Aijiren is the leading supplier of Clear Reagent Bottle with GL45 Screw Cap since 2007, is a reliable supplier of lab consumables.

Conical glass inserts have a tapered bottom with pulled tips and are available with or without plastics polypropylene springs. The spring acts as a shock absorber during needle penetration and raises the insert above the bottom of the vial, allowing greater sample recovery.

Flat bottom glass inserts have the largest capacity and are the most economical inserts. These inserts are cylindrical in shape with a flat bottom.Aijiren is the leading supplier of Flat bottom glass inserts since 2007.

Chromatography septas can be pre-slit. A pre-slit septum is an ideal choice in applications requiring 20% or more of the sample injection each time from the vial so that suction is avoided. The slit allows ambient gas to equalize the gas in the vial so that a vacuum is not created in the vial from the tight seal around the needle. If coring or clogging from a narrow needle or needle deflection from highly durable septa material is a concern, then choosing a pre-slit septum is a better choice.
A PTFE/Silicone with a slitted septum allows for easier needle penetration as well as to release the vacuum that forms when a large volume of sample is withdrawn from a vial. This septum provides chromatographic characteristics similar to that of a septum without a slit except that the ability to withstand exposure to aggressive solvents is slightly lessened. Pre-slit septa are highly recommended for improving injection-to-injection reproducibility with autosamplers withdrawing greater than 50µL of sample from a 2mL vial, due to possible cavitation (vacuum).