---
product_id: 24837919
title: "Kester Flux Formula 2331-ZX Water Soluble Flux Pen by Kester"
brand: "kester"
price: "VT5456"
currency: VUV
in_stock: true
reviews_count: 8
category: "Kester"
url: https://www.desertcart.vu/products/24837919-kester-flux-formula-2331-zx-water-soluble-flux-pen-by
store_origin: VU
region: Vanuatu
---

# Water-soluble, easy clean 10mL precision flux volume Made in USA quality Kester Flux Formula 2331-ZX Water Soluble Flux Pen by Kester

**Brand:** kester
**Price:** VT5456
**Availability:** ✅ In Stock

## Summary

> 💡 Flux like a pro — clean, precise, and hassle-free soldering every time!

## Quick Answers

- **What is this?** Kester Flux Formula 2331-ZX Water Soluble Flux Pen by Kester by kester
- **How much does it cost?** VT5456 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/24837919-kester-flux-formula-2331-zx-water-soluble-flux-pen-by)

## Best For

- kester enthusiasts

## Why This Product

- Trusted kester brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Neutral pH, No Corrosion:** Protects your boards with a flux that won’t damage solder masks or laminates.
- • **Water-Soluble & Eco-Friendly:** Cleans effortlessly without harsh chemicals, cutting cleaning costs and environmental impact.
- • **Odorless Soldering Experience:** No offensive smells, making your workspace more pleasant and professional.
- • **Precision Application, Zero Mess:** Pen design delivers exact flux amounts for flawless soldering every time.
- • **Trusted by Pros, Loved by Makers:** Industry-standard flux trusted in telecom, computing, and critical electronics assembly.

## Overview

The Kester 2331-ZX Flux Pen is a 10mL water-soluble flux designed for both leaded and lead-free soldering on conventional and surface mount circuit boards. Made in the USA, it features a neutral pH formula that ensures excellent ionic cleanliness without damaging solder masks or laminates. Its odorless, low-foaming chemistry improves productivity and reduces cleaning costs, making it a top choice for professionals in telecommunications, computing, and electronics manufacturing.

## Description

Kester 2331-ZX Flux Pen is designed for leaded and lead-free rework of conventional and surface mount circuit board assemblies. 2331-ZX Flux Pen is an innovation in organic acid water-soluble flux chemistry for soldering circuit board assemblies. This unique, neutral pH chemistry flux provides the best ionic cleanliness of any organic water-soluble flux available to the electronics industry. This popular flux has been used for soldering critical assemblies in the telecommunications, computer and other industries. No offensive odors will be emitted during soldering. 2331-ZX Flux Pen will not create excessive foaming in standard water cleaning systems. 2331-ZX Flux Pen has good soldering properties for improved productivity without sacrificing reliability of the assembly. This flux does not attack properly cured solder masks or FR-4 epoxy-glass laminate. 2331-ZX Flux Pen is not detrimental to the surface insulation resistance of the soldered assembly. Use of this flux minimizes cleaning costs while complying with environmental regulations.

Review: Best solution to that old bottle and brush. - The least messy, easiest to use most precise method of applying flux before soldering your connections. Every kit should have one.
Review: If you do electronics, you need a flux pen - I’ve been working on a few projects and this pen is a life saver. It quickly applies just the right amount of flux to clean the metal while soldering. There is no mess. I’ve used these pens for years and I swear by them. Highly recommend!

## Features

- Kester 2331ZX pen
- 10ML
- Made in the USA
- Package dimensions: 1.0 inches (H) x 4.0 inches (L) x 3.0 inches (W)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0195UY2WW |
| Batteries required | No |
| Best Sellers Rank | #107,526 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #104 in Soldering Flux |
| Customer Reviews | 4.2 4.2 out of 5 stars (65) |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.01 ounces |
| Item model number | 83-1097-2331 |
| Manufacturer | Kester |
| Package Dimensions | 5.3 x 0.4 x 0.25 inches |
| Volume | 10 Milliliters |

## Product Details

- **Age Range (Description):** Adult
- **Brand:** Kester
- **Color:** White
- **Ink Color:** White
- **Writing Instrument Form:** Ballpoint Pen

## Images

![Kester Flux Formula 2331-ZX Water Soluble Flux Pen by Kester - Image 1](https://m.media-amazon.com/images/I/51NdR4BS4yL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Best solution to that old bottle and brush.
*by G***S on June 17, 2020*

The least messy, easiest to use most precise method of applying flux before soldering your connections. Every kit should have one.

### ⭐⭐⭐⭐⭐ If you do electronics, you need a flux pen
*by A***Y on October 28, 2020*

I’ve been working on a few projects and this pen is a life saver. It quickly applies just the right amount of flux to clean the metal while soldering. There is no mess. I’ve used these pens for years and I swear by them. Highly recommend!

### ⭐⭐⭐⭐⭐ Perfect when doing SMD
*by C***E on August 31, 2020*

Helps with soldering, very easy to use and convenient.

## Frequently Bought Together

- Kester 2331ZX Water Soluble Flux Pen, White
- Lesnow solder wick braid 10ft Length Desoldering Wick Braid Remover Tool Solder Sucker 1 piece No-Clean soldering Wick Wire Roll and Disassemble Electrical Components
- Thermaltronics TMT-TC-2 Tip Tinner (20g) in 0.8oz Container

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**Shop now:** [https://www.desertcart.vu/products/24837919-kester-flux-formula-2331-zx-water-soluble-flux-pen-by](https://www.desertcart.vu/products/24837919-kester-flux-formula-2331-zx-water-soluble-flux-pen-by)

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-03-19*