8-425 Screw Neck Vials ND8

Description

Feature

Specification

Application

Product

FAQ

Packing and Delivery

Overview

The ND8 8-425 series is the gold standard for laboratories requiring high-precision sealing in narrow-neck configurations.

Engineered with a 7.0 or 5.0 expansion coefficient, these vials minimize sample-to-glass interaction, ensuring peak integrity during sensitive chemical analysis.

Nd8 Application

Versatile sample storage and analysis for demanding environments.

Chemical Inertness: USP Type I glass prevents pH shifts.

Thermal Stability: High resistance to temperature fluctuations.

Precision Threading: 8-425 finish eliminates cap tilting.

Uniform Bottom: Flat base ensures optimal vial movement in autosamplers.

UV Protection: Amber glass options for light-sensitive compounds.

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Ordering Specification Table

Strategic Sourcing & Technical Selection Guide

Glass Grade & Chemical Resistance Comparison

Caps & Septa Pairing Guide

Ensuring that 8-425 vials fit your specific robotic arm and needle depth is critical to preventing laboratory downtime. While ND9 vials are "Short Thread," the 8-425 ND8 series is a standard thread designed for precision narrow-neck instruments. Use the table below to verify compatibility with your existing hardware.

Instrument Brand	Compatibility	Recommended Series
Shimadzu	Full Compatibility	SIL-20/30/40 Nexera/Prominence
Hitachi	Full Compatibility	L-2000 / LaChrom Elite
Varian	Full Compatibility	8100/8200/8400 Series
Jasco	Full Compatibility	AS-2050 / AS-2055 / AS-4050
Agilent	Use with Adapter	For 11mm Tray (Not Recommended for ND8)

Not all borosilicate glass is equal. The expansion coefficient directly impacts the pH stability of your sample and the vial's resistance to thermal shock. For high-sensitivity chromatography, selecting the correct glass type prevents unwanted ion leaching and peak interference.

Feature	5.0 Type Borosilicate (USP I)	7.0 Type Borosilicate (USP I)
Hydrolytic Resistance	Superior (Grade 1)	High (Grade 1)
Expansion Coefficient	50 x 10-7/K	70 x 10-7/K
pH Drift Risk	Minimal (Ideal for trace analysis)	Low (Suitable for routine tests)
Best For	Sensitive pharmaceutical analytes	Standard environmental/food testing
Cost Performance	Premium Grade	Cost-Effective

A vial is only as good as its seal. Choosing the wrong septa can lead to sample contamination or needle damage. This guide helps procurement managers match the correct 8-425 closure system to the specific solvents and injection frequencies used in your laboratory.

Solvent Type	Recommended Septa	Property
Acids, Bases, Alcohols	PTFE / Silicone (White/Red)	Excellent resealability for multiple injections
Aggressive Organics	PTFE / Silicone / PTFE	Double-sided protection against corrosion
High Volatility	Integral Bonded Septa	Prevents septa displacement during puncture
Single Injection	PTFE only (Thin)	Economical but offers no resealing capability
Easy Puncture	Pre-slit Septa (Pre-cut)	Protects fragile/thin needles from bending

Professional Solutions

Precision-Engineered Solutions for Complex Chromatographic Workflows.

Seamless Integration with Robotic Arms

The 8-425 thread is specifically calibrated for narrow-neck systems like Shimadzu and Hitachi. Our vials undergo rigorous dimensional testing to ensure that robotic grippers can position them without jams or mechanical errors during high-throughput sequences.

Advanced Silanization for Reactive Analytes

For labs dealing with proteins, phenols, or other polar compounds, our silanized 8-425 vials provide a deactivated surface. This prevents sample adsorption on the glass wall, ensuring maximum recovery and peak reproducibility in trace analysis.

Exceptional Sealing Against Evaporation

Standard 8-425 openings minimize the headspace and surface area exposed during puncture. When paired with our high-resiliency PTFE/Silicone septa, it maintains vacuum integrity even during prolonged 24-hour sequence runs with highly volatile solvents.

Uniform Amber Glass for UV Shielding

Our amber vials are manufactured using high-quality USP Type I glass with consistent wall thickness. This provides reliable UV protection for vitamins, catecholamines, and other light-sensitive analytes, preventing sample degradation during storage.

Certified Cleanliness for Trace Analysis

Produced in ISO-certified cleanroom environments, every batch of ND8 vials is free from organic contaminants. The clear write-on spot allows for precise manual labeling, essential for maintaining strict GLP/GMP traceability in pharmaceutical labs.

Expert Troubleshooting & FAQ

To assist our procurement partners and laboratory technicians in making informed decisions, we have compiled the most critical technical questions regarding the 8-425 (ND8) screw neck vial system.

Why use 8-425 instead of 9-425 vials?

8-425 (ND8) vials are specifically designed for autosamplers with narrow-opening requirements, such as certain Shimadzu or Varian models. The 8mm neck provides a superior seal for highly volatile samples by reducing the headspace surface area compared to 9-425 wide-opening vials.

Is your Type 1 Borosilicate glass truly alkali-free?

While no glass is 100% alkali-free, our USP Type I Borosilicate glass (5.0 and 7.0 expansion) is tested for minimal ion leaching. This ensures that your mobile phase pH remains stable, which is critical for the reproducibility of sensitive chromatographic peaks.

What are the benefits of Silanized 8-425 vials?

Silanization (deactivation) creates a hydrophobic surface on the glass wall. This prevents polar analytes—such as proteins, phenols, or alkaloids—from adsorbing onto the glass, ensuring maximum sample recovery in trace-level analysis.

How do I choose between 5.0 and 7.0 expansion glass?

5.0 expansion glass is the premium choice for pharmaceutical labs requiring extreme hydrolytic resistance. 7.0 expansion glass offers excellent performance for routine environmental and food testing at a more cost-effective price point. Both are USP Type

Can your septa withstand aggressive organic solvents?

Yes. Our PTFE/Silicone septa are chemically inert. For extremely aggressive solvents like Hexane or THF, we recommend our "PTFE/Silicone/PTFE" sandwich septa, which provide an extra layer of protection against chemical attack and coring.

May

Packing and Delivery

Packing

Each vial is individually protected in shrink-wrapped trays, 100–200 pcs per inner box, then packed into corrugated export cartons.

Labeling

Each carton includes lot number and product information for traceability.

Delivery Time

Normally 7–15 working days after order confirmation.

Shipping Options

Air freight, sea freight, or express (DHL/UPS/FedEx) available upon request.

Storage Condition

Store in a clean, dry environment at room temperature.

Company Profile

Zhejiang Aijiren Technology Co., Ltd.

A dedicated original manufacturer of chromatography and laboratory consumables.

10,000+ m² modern facility with Class 100,000 cleanrooms
Automated production lines and rigorous in-house quality control
High-volume capacity, fast lead times, and reliable global supply
OEM/ODM customization with full batch traceability
Trusted by laboratories and analytical instrument brands worldwide

VR Showroom

OEM/ODM Custom Laboratory Consumables

Aijiren turns your customized requirements—size, material, color, logo, or packaging—into reliable, ready-to-use products.

OEM/ODM

Precise manufacturing based on your drawings and specifications, with one-stop development support

Confidentiality

Full protection of all commercial information, molds, and designs

Stable Supply

Automated production ensures consistent quality and fast lead time

Technical Support

Dedicated team ensures smooth communication and hassle-free delivery

FAQ From Customers (VR Display)

What certificates do you have?

Aijiren is certified to ISO 9001:2015 by SGS, ensuring controlled manufacturing processes and stable, fully traceable product quality.

With continuous investment in R&D and multiple independent patents, we deliver high-performance and reliable consumables to laboratories worldwide.

Some of the certificates of Aijiren are displayed

What’s the MOQ? Do you accept small orders?

Aijiren supports both standard and small batch orders. While MOQ varies by product type, we are happy to accommodate smaller quantities for trial, testing, or special projects. Please contact us for specific requirements. aijiren Quality control

Is the quality guaranteed?

All Aijiren products undergo random sampling and multiple in-house quality tests. Each batch is fully traceable, ensuring stable and reliable performance for your laboratory work.

What kind of after-sales support does Aijiren provide?

Aijiren provides practical after-sales support:

● Returns & replacements: Any product affecting use or sales can be returned or replaced.

● Technical support: Assistance with product use and troubleshooting.

● Order tracking & follow-up: We monitor shipments and follow up to ensure timely delivery.

● Dedicated contact: Aijiren provides a direct contact for after-sales inquiries.

This ensures your laboratory work runs smoothly with minimal disruption.

How long will it take for orders?

The delivery time depends on the order quantity and whether customization is required:

In-stock products: shipped within 3–7 days after payment
Standard bulk orders: shipped within 2–4 weeks
OEM/ODM customized products: shipped within 3–5 weeks (depending on mold, logo, color, packaging, etc.)
Aijiren has automated production lines and a 100,000-class cleanroom, ensuring stable lead times and reliable supply.