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100pcs blue 9-425 solid top screw caps with PTFE silicone liner for 1.5ml vials

Bulk pack of 100 blue 9mm solid top chromatography vial caps

Sealed 100pcs bag of blue 9-425 solid top storage caps

Technical specifications of 9mm solid polypropylene cap and red PTFE liner

Close-up of blue solid top cap on vial showing no needle hole

Blue solid top caps shown on clear and amber glass 1.5ml vials

Laboratory sample storage using vials with blue solid top caps

Syringe needle piercing the septa of a capped 1.5ml HPLC vial

100 count blue polypropylene caps for chromatography vials

Multi-view of vials with blue caps in lab trays and autosamplers

Blue 9-425 caps shown on clear and amber 1.5ml glass vials

Technical specs of polypropylene cap with red PTFE white silicone septa

A professionally sealed transparent bag of 100pcs blue vial caps

Close-up of 9-425 screw thread cap being held by a lab professional

100pcs blue 9-425 screw caps with septa for 1.5ml autosampler vials

Features & Details

⚙️ TWO CAP STYLES	Pre-slit caps give clean needle penetration, and solid caps suit long-term sample storage.
🛡️ PTFE / SILICONE SEPTA	PTFE layer resists aggressive solvents, and the silicone core reseals after every injection.
🔄 RIBBED EASY GRIP	Knurled sides stay easy to tighten, even while wearing lab gloves.
📦 UNIVERSAL 9-425 FIT	Matches all standard 9 mm mouth chromatography vials from Xin Tester and other autosampler brands.

About this item

Product specification

Xin Tester® Cap & Septa Specifications

Feature	Description
Brand	Xin Tester®
Thread Size	9-425 Screw Thread
Variant 1 (Pre-Slit)	Blue Ribbed Cap (Center Hole) + Pre-Slit Septa
Variant 2 (Solid)	Blue Ribbed Solid Cap (Closed Top) + Solid Septa
Septa Material	White PTFE / Red Silicone
Compatibility	1.5ml / 1.8ml / 2ml HPLC Vials
Quantity	100 Pcs / Pack (Caps Only)

Professional Autosampler Vial Caps

Chemists require absolute sample integrity during high-throughput testing. Therefore, Xin Tester proudly introduces our premium Autosampler Vial Caps. We manufacture these 9-425 screw caps using high-quality blue polypropylene. Furthermore, we pair them with advanced PTFE/Silicone septa. Consequently, you can protect your valuable samples from evaporation effectively.

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Pre-Slit vs. Solid Variants

We offer two distinct cap styles. Specifically, our pre-slit caps prevent vacuum build-up for thin autosampler needles. Conversely, our solid closed-top caps provide a complete airtight barrier. Ultimately, they prevent solvent evaporation during long-term storage perfectly.

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Premium Double-Layer Septa

The heart of our caps is the advanced septa. The red PTFE layer provides excellent chemical resistance against aggressive solvents. Meanwhile, the white silicone core ensures exceptional resealing after needle withdrawal. Therefore, you can perform multiple automated injections safely.

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Ergonomic Ribbed Design

Analysts often handle vials while wearing slippery laboratory gloves. Consequently, we designed these caps with an ergonomic ribbed exterior. This ribbed texture increases grip friction significantly. As a result, you can tighten and loosen the caps effortlessly.

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Universal Compatibility

You need consumables that fit your existing laboratory equipment. We manufacture these caps to strict international 9-425 thread standards. Specifically, they fit almost all standard 1.5ml and 2ml chromatography vials seamlessly. You can use them with Agilent systems without issues.

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Tech Insight: The Science of Septa

Why do we combine PTFE and silicone? Pure PTFE provides a highly inert chemical barrier. However, it lacks elasticity. Conversely, pure silicone offers unmatched elasticity but reacts poorly to certain solvents.

By combining both materials, our Autosampler Vial Caps deliver the best of both worlds. To explore advanced chromatography techniques and equipment standards, we highly recommend reading the peer-reviewed articles on ScienceDirect.

Stock Up on Essential Chromatography Supplies

Xin Tester supplies top-tier consumables for your analytical research. Sold in a convenient pack of 100, these caps offer an economical choice for busy research centers and industrial testing labs.

Do you need matching 2ml glass vials or vial inserts?
Browse our complete lab collection |
Contact sales for bulk pricing

Use Cases

Acid & Corrosion Resistant Chemical Synthesis Leak-Proof Design Micro-Volume Analysis

FAQs

Q1: How do I choose between Pre-Slit and Solid caps?

A: You should choose Pre-Slit caps if your autosampler uses a very thin or blunt needle. The slit prevents a vacuum from forming inside the vial during aspiration. Conversely, choose Solid (closed) caps if you need to store volatile samples for extended periods to prevent evaporation.

Q2: What does "9-425" actually mean?

A: The “9” refers to the outer diameter of the vial’s mouth (9mm). The “425” refers to the specific thread pitch (the distance between the screw threads). Therefore, these Autosampler Vial Caps will perfectly fit any vial that shares this standard 9-425 thread finish.

Q3: Are these caps pre-assembled with the septa?

A: Yes. We pre-assemble the PTFE/Silicone septa directly into the blue polypropylene caps at our factory. Consequently, you save valuable laboratory time and reduce the risk of contaminating the septa during manual assembly.

Q4: What is the maximum temperature these caps can withstand?

A: We manufacture the caps from high-quality polypropylene (PP). They can generally withstand temperatures up to 135°C (275°F). Furthermore, the PTFE/Silicone septa are highly heat-resistant, making them suitable for standard GC and HPLC applications.

Xin Tester 9-425 Autosampler Vial Caps with PTFE/Silicone Septa, Pre-Slit or Solid (100 Pcs)

Price range: $7.46 through $7.79

Extra 5% Off with code: welcome5

SIZE

Clear

6–12 Month Warranty

Repair & Refund support available for most products.

Free Worldwide Shipping

Ships within 3 business days.

Taxes & Duties

Buyer responsible for local import fees.

24/7 After-Sales Support

Technical assistance & video guidance within 24h.