Which acids do acid-proof bricks resist?

Acid-proof bricks resist sulphuric, hydrochloric, nitric, phosphoric, acetic, citric, lactic and most other mineral and organic acids at all concentrations. They do NOT resist hydrofluoric acid (HF), strong alkalis, or molten salts — for those, switch to carbon brick or fluoropolymer linings. Always specify the chemical environment when ordering.

What is the standard for acid-proof bricks in India?

IS 4860 specifies acid-resistant bricks by acid solubility (max 2% loss in boiling sulphuric acid for Class 1 bricks), apparent porosity (max 6%), water absorption (max 2%), and compressive strength (min 70 MPa for Class 1). Shanker Agencies supplies fully IS 4860 Class 1 compliant bricks from Crown Ceramics, our authorised dealership.

What jointing material is used with acid-proof bricks?

Three families: silicate-based cement (cheapest, used for sulphuric/HCl service), furan resin mortar (best chemical resistance, used for organic acid and alkali service), and polymer mortar (epoxy, vinyl-ester for severe duty). Joint material must be matched to the chemical environment; wrong jointing is the most common failure mode of acid-proof linings.

How are acid-proof bricks installed?

Surface preparation: clean concrete or steel substrate, primer coat. Membrane: bituminous or rubber sheet to seal the substrate. Bedding: chemical-resistant mortar at 6–10 mm thickness. Brick-laying: stretcher bond, joints 3–6 mm wide, fully filled. Cure: 24–72 hours before chemical exposure. Skilled installation is essential — bad workmanship will fail in months.

How long do acid-proof brick linings last?

Properly installed acid-proof brick linings in pickling tanks and acid storage typically last 8–15 years before requiring full relining, with localised joint repairs every 2–3 years. Life is limited by joint deterioration, mechanical impact, and thermal cycling. Linings exposed to dilute acid usually last longer than concentrated, due to slower joint attack.

Popular ChoiceAcid Proofing 900°C

ACID PROOF BRICKS

Dense vitrified bricks with 97–99%+ acid resistance for chemical vessels and reactors

PRODUCT OVERVIEW

Acid proof bricks are manufactured from selected clays fired to vitrification, producing a product with very low water absorption (0.1–6%), high density, and excellent chemical resistance to virtually all inorganic and organic acids except hydrofluoric acid (HF). They are bonded with acid-resistant cements (furan, phenolic, or potassium silicate based) to form acid-proof linings for chemical storage tanks, reaction vessels, absorption towers, and effluent channels.

KEY PROPERTIES

Water Absorption

< 0.5% (Class II) / 3–6% (Class I)

Acid Resistance

97% min (Class I) / 99%+ (Class II)

Alkali Resistance

75% min (Class I) / 85% (Class II)

Compressive Strength

40 – 50 MPa

Chemical Bond

Furan resin / Phenolic / K-silicate

Not Resistant To

Hydrofluoric acid (HF), hot alkalis

APPLICATIONS

Acid storage tank lining (H₂SO₄, HNO₃, HCl, H₃PO₄)

Reaction vessel and reactor lining

Absorption tower internal lining

Chimney and flue gas duct lining

Effluent treatment plant sumps and channels

Fertiliser plant — sulphuric acid plant

Pickling tank lining (steel processing)

Battery room floors

TECHNICAL SPECIFICATIONS

Grade	Absorption	Acid Resist.	Alkali Resist.	CCS	Size
Class I	3-6%	97% min	75%	40 MPa	230×113×65mm std
Class II	<2%	99% min	85%	50 MPa	230×113×65mm std
Class III	<0.5%	99.5% min	90%	55 MPa	Custom
Carbon-Fill	<1%	99.5% min	95%	45 MPa	Standard + custom
Anti-static	<2%	99% min	85%	45 MPa	230×113×65mm std

* Test conditions: IS 1528 (India) / ASTM C-133 / EN 1402. Values are typical — exact data sheets available on request.

AVAILABLE GRADES

Class I (Standard)Class II (Premium)Class III (High-purity)Carbon-FilledAnti-static

INSTALLATION NOTES

1
Surface preparation: concrete or steel substrate must be clean, dry, and free of oil/grease
2
Apply primer coat — epoxy primer for steel, concrete primer for concrete substrate
3
Use appropriate acid-resistant cement: furan resin (best acid resistance), phenolic resin, or potassium silicate
4
Bed mortar thickness: 3–6 mm, applied to both brick and substrate (buttered joint)
5
Joint width: 3–6 mm, fully filled with acid-resistant mortar
6
Curing: furan resin mortars — 24 hrs at 25°C before any chemical exposure; heat curing improves performance
7
Test before commissioning: hydraulic leak test or chemical spot test

WHY BUY FROM SHANKER AGENCIES

Shanker Agencies supplies Crown Ceramics acid proof bricks (IS 4860 compliant) along with the complete range of Chemset acid-resistant mortars and cements. We provide lining design support for new constructions and repair specification for existing linings.

PARTNER BRANDS

Crown Ceramics Mahakoshal

FREQUENTLY ASKED QUESTIONS

Acid-proof bricks are dense, vitrified ceramic bricks formulated to resist acidic chemical attack. They are used to line acid-storage tanks, process vessels, neutralisation pits, fertiliser plant floors, pickling tanks, electrolyte cells, and chemical-plant trenches and drains. They withstand most mineral and organic acids (except HF) at temperatures up to 800–1000°C.

QUICK INFORMATION

Max Temperature

900°C

READY TO ORDER OR NEED A SAMPLE?

Our engineers can recommend the exact grade for your application. Sample kits available for trials. No minimum order on standard grades.

Get a Quote Call +91 98999 57888