---
product_id: 40824609
title: "Duda Energy 1 Quart / 950ml 85% Food Grade Phosphoric Acid Rust Remover Clean Etch Metal"
brand: "duda energy"
price: "12544 kr"
currency: ISK
in_stock: true
reviews_count: 8
category: "Duda Energy"
url: https://www.desertcart.is/products/40824609-duda-energy-1-quart-950ml-85-food-grade-phosphoric-acid
store_origin: IS
region: Iceland
---

# 950ml liquid volume for multiple uses 85% pure phosphoric acid concentration Effective rust removal & metal etching Duda Energy 1 Quart / 950ml 85% Food Grade Phosphoric Acid Rust Remover Clean Etch Metal

**Brand:** duda energy
**Price:** 12544 kr
**Availability:** ✅ In Stock

## Summary

> ⚡ Rust? Removed. Metal? Revived. Your DIY edge starts here.

## Quick Answers

- **What is this?** Duda Energy 1 Quart / 950ml 85% Food Grade Phosphoric Acid Rust Remover Clean Etch Metal by duda energy
- **How much does it cost?** 12544 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/40824609-duda-energy-1-quart-950ml-85-food-grade-phosphoric-acid)

## Best For

- duda energy enthusiasts

## Why This Product

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

## Key Features

- • **Trusted & Top-Ranked:** Highly rated with 4.8 stars and a top 1,400 rank in corrosion inhibitors—join the savvy pros who rely on Duda Energy.
- • **Economical & Efficient:** Concentrated formula lets you dilute to your needs, saving money over expensive branded rust treatments.
- • **Low-Effort Restoration:** Skip tedious sanding—just apply, wait, rinse, and paint for a professional finish every time.
- • **Versatile Metal Savior:** Perfect for cast iron, steel, wrought iron—restores and preps surfaces with minimal effort.
- • **Industrial-Grade Purity:** 85% food-grade phosphoric acid ensures powerful, reliable rust removal without compromise.

## Overview

Duda Energy’s 85% food-grade phosphoric acid is a potent, cost-effective rust remover and metal etchant designed for professionals and DIY enthusiasts alike. With 950ml of concentrated liquid, it efficiently restores iron, steel, and wrought iron surfaces by dissolving rust and prepping metal for painting, all while reducing labor compared to traditional sanding methods. Trusted by users for its high purity, versatility, and excellent value, it’s a must-have for anyone serious about corrosion care.

## Description

85% pure phosphoric acid

Review: Quality, works well, and more economical than buying products that include phosphoric acid - 85% is a very strong concentration for phosphoric acid. I used it, after brushing away loose scale, on rusty cast-iron, wrough, iron, and steel plant stands that we have all over the place. I let the acid treatment sit for a few hours to a day to dry, follow that with a light rinse and dry again, then touch up (spray) paint. It takes longer in terms of duration, but the effort level is lower than sanding and brushing down to bare metal, priming, and then painting. I suggest diluting this acid at least 50-50 to start. You can adjust up or down from there the higher, the concentration you use, the longer it will take to dry, and it tends to take on a greasy sort of feel if the concentration is really high. High quality.
Review: Cheap rust prevention - Worked great as a rust treatment on my vw floor pan. Same thing as the expensive brands marketed for the application.

## Features

- Food Grade
- 85% Purity (15% water)
- Typically used to remove rust from metals

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B06Y1B82TG |
| Best Sellers Rank | #35,038 in Automotive ( See Top 100 in Automotive ) #110 in Care Corrosion & Rust Inhibitors #1,386 in Oils & Fluids |
| Brand | Duda Energy |
| Brand Name | Duda Energy |
| Contains Liquid Contents? | Yes |
| Customer Reviews | 4.8 out of 5 stars 186 Reviews |
| Item Form | Liquid |
| Item Volume | 950 Milliliters |
| Item Weight | 3.63 Pounds |
| Manufacturer | Duda Energy |
| Number of Items | 1 |
| Scent | Sour |
| Special Features | Rust Resistant |
| Specific Uses For Product | Drain |
| Surface Recommendation | Metal |
| UPC | 840194133708 |
| Unit Count | 32.1 Fluid Ounces |

## Product Details

- **Brand:** Duda Energy
- **Item Form:** Liquid
- **Item Volume:** 950 Milliliters
- **Scent:** Sour
- **Specific Uses For Product:** Drain

## Images

![Duda Energy 1 Quart / 950ml 85% Food Grade Phosphoric Acid Rust Remover Clean Etch Metal - Image 1](https://m.media-amazon.com/images/I/61cPTRRNZeL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: I heard I should use Phosphoric acid to etch grout before applying a sealant.  Would this product be good for that?**
A: using Phosphoric acid on grout will basically erode or eat away a very fine layer of grout. this opens the pores and gives the grout more bite for the color seal to bond. When grout cures after installation, it gets almost like a skin on the surface from settling, or at least a tighter surface tension. When you hit this with Phosphoric acid, it opens it up and makes it slightly rougher. If you don't color seal, it will make it more prone to staining in the future.

It doesn't always need to be done, but it will help the color seal bond.

**Q: Can I use this on rusty kitchenware? Like pots and pans,?**
A: This can  be used as a rust remover. Be sure to use gloves! Great for cleaning residue from metals.

**Q: Can I clean the rust from cast iron cooking pans with this?  It says it has an inhibitor that remains behind, so I wasn't sure if it would be safe.**
A: USE POTATO AND COURSE SALT TO CLEAN CAST IRON. but FIRST !!! PUT IT IN A RED HOT CAMP FIRE COALS AND BURN IT OFF BEST WAY!!! THEN AFTER IT COOLS OFF ENOUGH TO NOT CATCH THE VEG OIL ON FIRE WHEN YOU APPLY IT TO THE CAST IRON.  BEST results! you can use charcoal also

**Q: I use a bathroom cleaner that contains 3.5% phosphorus acid. Is this product suitable for diluting to 3.5% with water for use as a bathroom cleaner?**
A: Yes, diluted phosphoric works well as a lime and hard water deposit remover for concrete, tile, and other stone surfaces.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Quality, works well, and more economical than buying products that include phosphoric acid
*by N***E on May 12, 2025*

85% is a very strong concentration for phosphoric acid. I used it, after brushing away loose scale, on rusty cast-iron, wrough, iron, and steel plant stands that we have all over the place. I let the acid treatment sit for a few hours to a day to dry, follow that with a light rinse and dry again, then touch up (spray) paint. It takes longer in terms of duration, but the effort level is lower than sanding and brushing down to bare metal, priming, and then painting. I suggest diluting this acid at least 50-50 to start. You can adjust up or down from there the higher, the concentration you use, the longer it will take to dry, and it tends to take on a greasy sort of feel if the concentration is really high. High quality.

### ⭐⭐⭐⭐⭐ Cheap rust prevention
*by S***S on December 7, 2025*

Worked great as a rust treatment on my vw floor pan. Same thing as the expensive brands marketed for the application.

### ⭐⭐⭐⭐⭐ Great bottle of Phos Acid
*by A***M on May 26, 2025*

Works great for all sorts of things food grade acid is good for. I bought it to clean my water softener and it's resin bed. Works amazing. Made my 7 year old resin soften hard well water like it's new again. Good price too

## Frequently Bought Together

- Duda Energy 1 Quart / 950ml 85% Food Grade Phosphoric Acid Rust Remover Clean Etch Metal
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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-03-03*