Oxalic Acid: Usage and Dosage
2026-05-07
Oxalic Acid: Usage and Dosage
Oxalic acid is a highly acidic compound with certain toxicity, mainly used in industrial cleaning, pharmaceutical synthesis, descaling and rust removal in specific fields. Direct contact may easily cause burns. It is mandatory to wear protective clothing, protective gloves and goggles throughout the process, and keep the operating environment well-ventilated to prevent the accumulation of acid mist in enclosed spaces. Below is a categorized elaboration on usage and dosage based on different scenarios, with flexible adjustments to ratios and dilution rates in industrial applications.
Metal rust removal:Prepare a solution with a concentration of 8%–12% (enhanced effect in a high-temperature alkaline environment). Dissolve 800 g to 1.2 kg of oxalic acid powder or crystals in every 10 kg of clean water. Spray the solution twice on the surface of large mechanical equipment or pipelines for stable results, with a single reaction time of about 15 minutes. After wiping, rinse with clean water until neutral to prevent residual acid from corroding materials.
Textile printing and dyeing auxiliaries: The dissolution step is particularly critical. Under normal pressure and high temperature (80°C–100°C), use 15 L of oxalic acid solution (3% concentration) per cubic meter of textile volume. Immerse the textile in the drum equipment until the solution penetrates the fibers, then treat for 8–12 minutes. Monitor discoloration and fabric changes in real time.
For household use, the dosage should be significantly reduced to avoid health risks:
To clean toilet tiles, use a dilute solution with a concentration of 1%–1.5%. Typically, dissolve 40–60 g of oxalic acid blocks in 2 L of clean water, let it sit on the stain for no more than 3 minutes, then scrub with a hard brush.
For stubborn rust spots on floor tiles with a small area, directly apply the stock solution to cover the marks and rinse with clean water within 5 minutes.
Note that after cleaning with oxalic acid, a waxy layer often forms on the tile surface, causing visual blurring. It is recommended to finish with a professional polish or neutral soapy water for a buffing effect.
To clean toilet tiles, use a dilute solution with a concentration of 1%–1.5%. Typically, dissolve 40–60 g of oxalic acid blocks in 2 L of clean water, let it sit on the stain for no more than 3 minutes, then scrub with a hard brush.
For stubborn rust spots on floor tiles with a small area, directly apply the stock solution to cover the marks and rinse with clean water within 5 minutes.
Note that after cleaning with oxalic acid, a waxy layer often forms on the tile surface, causing visual blurring. It is recommended to finish with a professional polish or neutral soapy water for a buffing effect.
Oxalic Acid from Zibo Anhao Chemical Co., Ltd.
Zibo Anhao Chemical Co., Ltd., founded in 2015 and based in Zibo, Shandong Province—China’s key chemical industry hub—is a reliable supplier and distributor of high-quality industrial chemicals, with oxalic acid as one of its flagship products. Our oxalic acid, also known as ethanedioic acid (CAS: 144-62-7 for anhydrous, 6153-56-6 for dihydrate), is a white crystalline solid with high purity up to 99.5% min, meeting strict industrial standards and international quality specifications.
Zibo Anhao Chemical Co., Ltd., founded in 2015 and based in Zibo, Shandong Province—China’s key chemical industry hub—is a reliable supplier and distributor of high-quality industrial chemicals, with oxalic acid as one of its flagship products. Our oxalic acid, also known as ethanedioic acid (CAS: 144-62-7 for anhydrous, 6153-56-6 for dihydrate), is a white crystalline solid with high purity up to 99.5% min, meeting strict industrial standards and international quality specifications.
Available in both anhydrous and dihydrate forms, our oxalic acid features stable chemical properties, excellent solubility in water and ethanol, and strong reducing and metal-complexing capabilities. It is widely applied in rust removal, textile bleaching, leather tanning, rare earth processing, water treatment, and chemical analysis, serving as a vital raw material across multiple industries.
Supported by robust supply chain management and strict quality control systems, we ensure consistent product quality, flexible packaging options (25kg bags or customized), and stable delivery cycles. Our oxalic acid has been exported to over 30 countries and regions, including Southeast Asia, Europe, America, and Africa, earning recognition for its premium quality, competitive pricing, and professional customer service.
Adhering to the philosophy of "Quality First, Customer Supreme", Zibo Anhao Chemical Co., Ltd. is committed to providing customers with high-quality oxalic acid and comprehensive chemical solutions. We strictly comply with safety and environmental regulations, ensuring sustainable production and supply while meeting diverse customer needs worldwide.
