Phosphoric Acid 85%

Powerful Descaler, Cleaner & pH Controller
Available in 1L, 5L, and 20L drums

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Tackle Rust, Scale & Stubborn Mineral Deposits—Fast

Viva Blu’s Phosphoric Acid is a high-purity, 85% strength industrial-grade acid ideal for removing rust, dissolving hard water scale, and lowering pH in water systems. It’s trusted across plumbing, food & beverage, and metalworks for its safety, reliability, and effectiveness.

Powerful Descaling Agent – Dissolves calcium, limescale, and iron deposits
Rust Remover – Restores metal surfaces without damaging the base material
Safe for Food Industry Use – Ideal for cleaning stainless steel equipment
pH Adjustment – Effective for lowering pH in water treatment systems
Non-Fuming – Safer and easier to handle than hydrochloric acid alternatives

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✅ Perfect for:

• Heat exchangers, boilers, and pumps

• Irrigation systems and lines

• Dairy and food processing equipment

• Commercial kitchens and breweries

• Rusted tools, tanks, and metal parts

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⚙️ Directions for Use

⚠️ Always add acid to water—never water to acid. Wear gloves, goggles, and protective clothing.

For Descaling / Cleaning:

• Dilute 1:10 to 1:20 with water (e.g. 100 mL acid in 1–2 L of water) depending on the severity of scale.

• Apply to the surface or circulate through the system.

• Let it sit for 10–20 minutes.

• Rinse thoroughly with clean water.

• Repeat if necessary for heavy deposits.

For Rust Removal:

• Use a 1:5 dilution (200 mL of acid per litre of water).

• Apply using a brush or soak method.

• Rinse and neutralise with bicarbonate solution if required.

For pH Adjustment in Water:

• Test water pH first.

• Add small quantities (e.g. 10–20 mL per 10,000 L of water), circulate, then retest.

• Add more as needed until desired pH is reached (typically 6.8–7.2 for pools).

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⚠️ Safety Notes:

• Not for use on marble or natural stone.

• Avoid contact with aluminium.

• Store in a cool, ventilated area away from incompatible materials.

• Keep out of reach of children.

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Available Sizes:

• 1L – Ideal for small-scale or test use

• 5L – Handy size for regular use or trades

• 20L – Bulk solution for industrial or commercial applications

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Why Choose Viva Blu Phosphoric Acid

✔ 85% high-purity concentration
✔ Australian compliant SDS available
✔ Backed by real-world chemical expertise
✔ Local stock & fast dispatch Australia-wide
✔ Trusted by professionals in filtration

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Technical Reference

Technical Specifications

Property	Detail
Chemical Name	Phosphoric Acid
IUPAC Name	Phosphoric Acid
Common Names	Orthophosphoric Acid, o-Phosphoric Acid, Phosphoric(V) Acid
Molecular Formula	H₃PO₄
Molecular Weight	98.00 g/mol
CAS Number	7664-38-2
Concentration / Grade	85% w/w (Industrial/Technical Grade)
Physical State	Liquid (viscous, syrupy at ambient temperature)
Appearance	Clear to slightly hazy, colourless to pale yellow viscous liquid
Density	Approximately 1.685 g/mL at 20°C
Boiling Point	158°C (decomposes to pyrophosphoric acid above 213°C)
Melting Point	21.1°C (pure 100%); 85% solution remains liquid well below 0°C
pH (1% v/v solution in water)	Approximately 1.5–2.0
pH (85% concentrate)	< 1.0
Solubility in Water	Miscible in all proportions
Vapour Pressure	Negligible at 20°C (< 0.03 mmHg); essentially non-fuming
Flash Point	Non-flammable
UN Number	UN 1805
ADG Class	Class 8 — Corrosive Substance
Packing Group	III (85% w/w solution)
Hazchem Code	2X

Applications & Use Cases

• Rust Removal & Metal Treatment: Converts iron oxide (rust) to iron phosphate, a stable, paintable surface layer, on steel, cast iron, and wrought iron components used in fabrication, maintenance, and restoration across Australian manufacturing and trades.
• Scale and Limescale Descaling: Dissolves calcium carbonate, calcium sulphate, and magnesium deposits from heat exchangers, boilers, cooling towers, pipe work, and industrial process equipment.
• Food & Beverage Equipment Cleaning: Approved for use in cleaning and sanitising stainless steel tanks, pipework, bottling lines, dairy equipment, and brewery vessels where food-contact applications require a phosphate-based acid cleaner (subject to appropriate dilution and rinsing).
• pH Reduction in Water Treatment Systems: Used to lower alkalinity and adjust pH in recirculating cooling water systems, process water circuits, and municipal or industrial effluent treatment.
• Swimming Pool and Spa pH Adjustment: Liquid alternative to dry acid (sodium bisulphate) for reducing pH and total alkalinity in pool and spa water; favoured where precise dosing and rapid dissolution are required.
• Concrete and Masonry Etching: Etches concrete surfaces prior to coating, epoxy flooring, or sealant application to improve adhesion; used in civil construction and industrial flooring.
• Metalworking and Surface Preparation: Pre-treatment step before galvanising, electroplating, powder coating, and painting operations to remove mill scale and surface oxides.
• Agricultural Equipment and Irrigation System Cleaning: Removes mineral scale and calcium deposits from drip irrigation emitters, headers, and agricultural spray equipment.
• Janitorial and Industrial Cleaning: Active ingredient in heavy-duty toilet bowl cleaners, bathroom scale removers, and tile grout cleaners.
• Fertiliser Manufacturing: Intermediate feedstock in production of monoammonium phosphate (MAP), diammonium phosphate (DAP), and triple superphosphate fertilisers.
• Water Softener and Sequestrant: At low doses, phosphoric acid derivatives act as sequestrants to prevent scale deposition in hot water systems and boiler feed water.

Dosing Rates & Guidelines

Application	Dosing Rate (85% concentrate)	Units	Notes
Swimming Pool pH Reduction (Residential)	10–20 mL per 10,000 L to reduce pH by ~0.2 units	mL per 10,000 L pool volume	Dilute minimum 1:10 in water before addition. Pre-dissolve away from pool walls. Re-test after 4 hours circulation. Target pH 7.2–7.6. Rate highly dependent on existing alkalinity and pool volume.
Swimming Pool pH Reduction (Commercial)	50–150 mL per 100,000 L per treatment	mL per 100,000 L pool volume	Dose via dosing pump into return line or dilution pot. Continuous monitoring recommended. Adjust based on live pH readings. SPASA guidelines apply.
Cooling Tower Water pH Control	0.5–2.0 mL/L (of circulating volume) to achieve target pH 7.0–8.0	mL/L	Dose via automatic dosing controller with inline pH probe. Inhibitor compatibility must be verified. Concentration cycles affect dosing frequency.
Industrial Descaling (static soak)	5–15% v/v solution (approx. 59–176 mL/L water)	% v/v	Soak time 30–120 minutes at ambient temperature (20–40°C). Heavy scale may require elevated temperature (50–60°C) or extended contact time. Rinse thoroughly with clean water after treatment.
Industrial Descaling (circulation/CIP)	2–8% v/v (approx. 24–94 mL/L water)	% v/v	Circulate at 40–60°C for 30–60 minutes. Monitor acid concentration during CIP cycle; replenish as required. Flush with clean water until neutral pH is achieved on drain.
Rust Removal (brush-on / immersion)	10–25% v/v (approx. 118–295 mL/L water)	% v/v	Brush or spray undiluted or diluted onto rusted surface. Allow 5–30 minutes contact. For immersion, maintain 15–25°C. Rinse with clean water and dry or prime immediately after treatment.
Concrete Etching	10–15% v/v (approx. 118–176 mL/L water)	% v/v	Apply to wetted surface, allow 5–15 minutes reaction (bubbling indicates activity). Neutralise with dilute sodium bicarbonate solution, scrub and rinse thoroughly before coating. Test adhesion before full application.
Food Equipment CIP Acid Wash	0.5–2.0% v/v (approx. 5.9–23.5 mL/L water)	% v/v	Use food-grade phosphoric acid where direct food contact possible. Circulate at 60–80°C for 15–30 minutes. Extensive potable-water rinsing required post-treatment. Verify food safety compliance with site management.
pH Adjustment — Effluent / Process Water	Variable; typically 0.1–1.0 mL/L per unit pH reduction required	mL/L	Rate highly dependent on initial alkalinity, buffering capacity, and target pH. Jar testing on representative sample strongly recommended before full-scale dosing. Dose via automated pH controller where possible.
Irrigation System Scale Removal	1–3% v/v (approx. 12–35 mL/L water) circulated through system	% v/v	Circulate for 30–60 minutes, then flush with clean water. Do not apply to growing plants or active root zones. Ensure system is isolated during treatment.

Note: All dosing rates are indicative and based on standard Australian industry practice. Actual rates must be determined by site-specific conditions including water chemistry, temperature, scale composition, and system volume. Always conduct a pilot test before full-scale application.

Dilution Instructions

Critical Safety Rule — Always Add Acid to Water

• Always add phosphoric acid to water. Never add water to concentrated acid. Adding water to concentrated acid causes localised violent exothermic reaction, spattering, and potential serious injury.

Equipment Required

• Polypropylene (PP), high-density polyethylene (HDPE), or fibreglass mixing vessel — do not use mild steel, galvanised, or aluminium containers
• Chemical-resistant measuring jug or graduated cylinder (HDPE or polypropylene)
• Chemical-resistant stirring rod (HDPE or glass)
• Appropriate PPE (see Safety & Handling section below)
• pH meter or calibrated pH test strips for verification
• Spill tray or bunded work area

Step-by-Step Dilution Procedure

1. Don full PPE before handling concentrate — chemical-resistant gloves (nitrile minimum 0.38 mm, neoprene or butyl rubber preferred), chemical splash goggles, face shield, and chemical-resistant apron.
2. Calculate the volume of acid required using the appropriate dosing rate for your application. Measure out the required volume of acid in a graduated HDPE container before proceeding.
3. Add the required volume of clean water to the mixing vessel first. Use ambient temperature water (15–25°C). Do not use hot water — heat accelerates the exothermic mixing reaction.
4. Slowly add the measured volume of phosphoric acid concentrate to the water while gently stirring. Add in a thin, controlled stream — do not pour rapidly. The solution will warm slightly; this is normal for phosphoric acid dilution at typical use concentrations, but proceed slowly regardless.
5. Stir gently until the solution is homogeneous. Allow to cool to ambient temperature before use if any warmth is noted.
6. Verify the diluted solution pH with a calibrated pH meter or appropriate test strips before application.
7. Label the diluted solution immediately with chemical name, concentration, date of preparation, and hazard information. Do not store in unlabelled containers.
8. Use prepared solutions promptly. Diluted phosphoric acid solutions may be stored in closed HDPE containers, but freshly prepared solutions are preferred for maximum efficacy.

Quick Dilution Reference

Target Concentration (% v/v)	Acid (85% conc.) per Litre of Final Solution	Water per Litre of Final Solution	Typical Application
1% v/v	10 mL	990 mL	Light equipment clean, food CIP rinse
2% v/v	20 mL	980 mL	Food/beverage CIP acid wash
5% v/v	50 mL	950 mL	Moderate scale removal, general descaling
10% v/v	100 mL	900 mL	Rust removal, concrete etching, heavy descaling
15% v/v	150 mL	850 mL	Heavy rust conversion, aggressive scale treatment