16mm COD Test Tube Screw PC Caps with PTFE Septa

Description

Feature

Specification

Product

FAQ

Packing and Delivery

Overview

This series of 16mm screw PC caps is specifically engineered for rigorous water quality analysis and chemical oxygen demand (COD) digestion processes. Crafted from premium polycarbonate, these caps deliver superior thermal stability and structural integrity to withstand intense heat and internal pressure without cracking.

The integrated PTFE/Silicone septa provide exceptional chemical inertness against aggressive acids and oxidizers, effectively preventing sample evaporation and cross-contamination. Available in HC type for robust general high-concentration testing and LVB type for minimized background interference in ultra-trace analysis.

Product Features

Professional-grade vial closures combining extreme pressure tolerance, superior chemical inertness, and optimized low-background performance.

Built for Digestion: PC shell offers excellent heat tolerance and mechanical strength, perfectly matching high-temperature digestion workflows.

Leak-Proof Seal: High-elasticity silicone combined with a pure PTFE layer ensures an airtight barrier against vapor loss and acid fumes.

Application-Specific Grades: Offered in HC (High Closure) and LVB (Low Blank Value) variants to suit different analytical precision levels.

Minimal Background Noise: LVB type undergoes cleanroom processing to minimize extractables and organic leaching for accurate baseline tests.

Universal Compatibility: Standard 16mm thread design fits seamlessly with major global brands of COD reactors, vials, and systems.

Related products

16mm Glass Digestion Tubes for COD Analysis

Specification

Procurement Decision Support

Part No.	Description	Type	Core Application	Pcs/Pack
COD-SC	White Screw PC Cap with PTFE Septa for 16mm test tube Closures, HC type	HC Type (High Closure)	Standard and high-concentration industrial wastewater COD digestion.	100
COD-SC-I	White Screw PC Cap with PTFE Septa for 16mm test tube Closures, LVB type	LVB Type (Low Blank Value)	Low-concentration COD testing and strict environmental trace analysis.	100

FAQ

Expert answers regarding selection, temperature tolerance, and reusability for COD digestion cap applications.

What is the main difference between COD-SC (HC) and COD-SC-I (LVB)?

HC type is standard for routine or high-concentration COD testing. LVB type features strictly controlled clean production to ensure ultra-low blank values for high-sensitivity trace analysis.

What is the maximum temperature limit for these PC caps and septa?

They are rated for continuous operation within standard COD digestion environments of 150°C to 165°C under normal working pressure limits.

Can these caps and septa be reused for multiple digestion cycles?

For reliable analytical accuracy and laboratory safety, single-use is highly recommended, as high heat can fatigue the seal and lead to cross-contamination.

Are these 16mm caps compatible with other brands of COD digestion tubes?

Yes, they feature standard 16mm industrial thread specifications, making them fully compatible with most major laboratory COD vials and reactors.

How does the septa material prevent chemical corrosion?

The side facing the sample consists of pure polytetrafluoroethylene (PTFE), a highly inert material that resists concentrated sulfuric acid and strong oxidizers.

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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.