Autosampler Vial

Micro Insert

Micro Insert is a precision component designed to reduce internal surface area in HPLC autosampler vials, improving sample recovery and reducing adsorption losses. The insert fits standard vial geometries and is used to maintain consistent injection volumes and enhance reproducibility in chromatographic analysis.

Reduces internal surface area in vials, minimizing sample adsorption and improving recovery for trace-level analysis
Available in conical bottom, flat bottom, and conical bottom with polyspring configurations for different sample types
PolySpring inserts self-align and cushion needle contact, reducing vial damage and needle wear
Glass inserts offer low extractables for sensitive HPLC and GC methods

Key Benefits

What This Product Gives You

Reduces internal surface area in vials, minimizing sample adsorption and improving recovery for trace-level analysis
Available in conical bottom, flat bottom, and conical bottom with polyspring configurations for different sample types
PolySpring inserts self-align and cushion needle contact, reducing vial damage and needle wear
Glass inserts offer low extractables for sensitive HPLC and GC methods

Available for 8-425 vials (100ul, 200ul, 300ul) and 9-425/11mm vials (250ul, 300ul, 400ul)
Three bottom configurations: conical, flat, and conical with polyspring
Dimensions: 29×4.8mm (100ul), 31×5mm (200ul, 300ul), 29×5.7mm (250ul), 31×6mm (300ul, 400ul)
Designed for use with standard autosampler vials and crimp or snap caps
PolySpring inserts provide self-alignment and cushioning during needle insertion

Where It Is Used

Applications And Buyers

Application Scenarios

Improving sample recovery in trace analysis where adsorption to vial walls causes signal loss
Reducing carry-over in high-throughput pharmaceutical QC labs using 8-425 and 9-425 vials
Minimizing needle impact damage during repeated injections in automated autosamplers
Maintaining consistent injection volume in methods sensitive to vial geometry changes
Supporting routine HPLC and GC analysis with low-cost, high-reliability inserts

Who It Is For

Pharmaceutical and biotech labs conducting trace-level quantification where sample loss affects accuracy
Environmental and food testing labs using 8-425 and 9-425 vials in automated autosamplers
Contract testing labs requiring consistent injection performance across multiple clients and methods
Lab managers seeking cost-effective solutions for routine sample preparation without sacrificing reproducibility
OEM partners needing custom inserts for branded autosampler systems

Problems It Solves

Sample adsorption to vial walls leading to low recovery and inaccurate quantification
Inconsistent injection volumes due to variable internal surface area in standard vials
Needle damage and vial breakage from repeated injection impacts
Carry-over between samples in high-throughput workflows
Lack of standardisation in insert geometry across different vial types and suppliers

Data

Specifications

Product Name	Micro-insert
Material	Borosilicate Glass, PP
For Vial Type	8-425 Vials, 9-425 Vials, 11mm Crimp Vials, 11mm Snap Vials
Volume	100ul (29×4.8mm), 200ul (31×5mm), 300ul (31×5mm), 250ul (29×5.7mm), 300ul (31×6mm), 400ul (31.6mm)
Bottom Type	Conical, Flat, Conical with Polyspring
Packing	100 pcs per pack
Insert Shape	Cylindrical with precision fit
Compatibility	Standard autosampler vials with 8-425 and 9-425 geometry

Materials

Borosilicate glass for low extractables and high chemical resistance

Customization Options

OEM private-label printing available through the Microlab OEM division
Custom dimensions and configurations can be developed for specific vial types
Private-label packing and branding supported for lab distributors and OEM partners
Different bottom types and materials can be selected per application

How It Is Made

Manufacturing And Quality Control

Manufacturing Process

Glass forming and annealing for borosilicate inserts
Dimensional inspection to match vial specifications
Assembly of polyspring components where applicable
Packing in PP boxes at 100 pieces per pack

Quality Control

Dimensional verification against vial geometry standards
Visual inspection for defects in glass and plastic inserts
Fit test with standard 8-425 and 9-425 vials to ensure proper seating
Polyspring alignment and spring tension checked for consistent performance

Comparison

Compared With The Alternatives

Versus Standard vials without inserts

Micro Inserts reduce internal surface area, lowering adsorption and improving recovery, especially for polar or low-concentration analytes

Versus Plastic inserts only

Borosilicate glass inserts offer lower extractables and better compatibility with aggressive solvents and high-temperature methods

Versus Non-self-aligning inserts

Polyspring inserts reduce needle misalignment and vial damage during repeated injections

Versus Reusable vial inserts

Single-use inserts eliminate carry-over risk and reduce cleaning burden in high-throughput labs

Use Guide

How To Use It

Select insert based on vial type: 8-425 for 100ul-300ul, 9-425/11mm for 250ul-400ul
Choose glass inserts for low extractables in sensitive HPLC/GC methods
Select conical bottom for better sample recovery, flat bottom for stability
Use polyspring inserts to reduce needle impact and vial breakage in automated systems
Ensure insert fits securely in the vial before capping and autosampling

Photos

Product Gallery

Also In This Category

Related Industries And Guides

Autosampler Vial and Closure Selection Guide

FAQ

Questions Buyers Ask

What is the difference between 8-425 and 9-425 vials?

8-425 vials have a 29mm diameter and are used for 100ul-300ul inserts. 9-425 vials have a 31mm diameter and are used for 250ul-400ul inserts with 11mm crimp or snap caps.

Can I use glass inserts with 11mm snap vials?

Yes. Glass inserts are available for 9-425 and 11mm snap vials in 250ul, 300ul, and 400ul sizes.

Do the inserts affect injection volume?

No. The inserts are designed to fit precisely within the vial, maintaining consistent liquid volume and injection reproducibility.

What is the purpose of the polyspring?

The polyspring provides self-alignment and cushions needle contact, reducing vial damage and needle wear during repeated injections.

How are the inserts packed?

Each insert is packed in PP boxes with 100 pieces per pack. The part number is printed on the box for traceability.

Can you supply these under our own brand?

Yes. The Microlab OEM division supports private-label printing, custom packaging, and contract manufacturing for lab distributors and OEM partners.