Chemical Containment Bunds with Certified High-Resistance EPDM
Seveso III legislation (DL 254/2007) requires watertight retention bunds at hazardous substance installations — environmental liability under DL 147/2008 is strict. EPDM membrane with certified resistance to 500+ industrial chemicals is the definitive secondary containment solution: single installation, 50+ year service life, complete licensing documentation.
The Chemical Containment Challenge: Strict Environmental Liability
DL 147/2008 (transposition of Environmental Liability Directive 2004/35/EC) establishes strict liability for operators of high environmental risk activities. Fault or negligence is not required — contamination alone is sufficient. A secondary containment bund that fails — through acid-attacked concrete, cracked epoxy coating, deficient joint — is the difference between spill containment and an environmental fine of millions of euros plus soil remediation cost.
- Seveso III legislation (DL 254/2007) requires watertight retention bunds with 110% of the largest vessel volume — inspectable and documented
- Strict environmental liability under DL 147/2008 — soil contamination from uncontained spill is direct financial responsibility of the operator
- Plain concrete in acid-product containment bunds has 10-20 year service life — progressive chemical attack difficult to detect before failure
- Epoxy coatings in containment bunds have 10-15 year service life — regular inspection and reapplication with operational disruption required
The EPDM Solution for Secondary Containment: Intrinsic Chemical Resistance
The EPDM chemical resistance datasheet covers over 500 common industrial products, including dilute inorganic acids (HCl, HNO₃, H₃PO₄), organic acids, strong alkalis (NaOH, KOH, NH₃), saline solutions and many organic compounds. The saturated EPDM polymer backbone has no reactive sites for acid to attack — the same chemical inertness that makes it durable in WWTP digesters. EPDM containment bunds are installed once and offer 50+ years of protection without recoating cycles.
- EPDM chemical resistance datasheet validated for 500+ industrial products — compatibility verification before each project
- Resistance to dilute inorganic acids, strong alkalis, saline solutions and organic compounds (within the compatibility envelope)
- Full-bond system to bund base and walls — no possibility of product migration under the membrane
- Complete technical documentation for Seveso/APA/IGAMAOT licensing including CE product data sheets and installation certificate
EPDM Benefits
Chemical Resistance to 500+ Industrial Products
EPDM resists dilute inorganic acids (HCl, HNO₃, H₃PO₄, HF up to certain concentrations), strong alkalis (NaOH, KOH, NH₃), high-concentration saline solutions (including NaCl, Na₂SO₄, CuSO₄), organic acids (acetic, formic, citric), and many polar organic compounds. The EPDM chemical resistance datasheet documents 500+ substances with adequacy ratings by temperature and concentration category.
100% Containment — Zero Infiltration to Soil
Zero chemical infiltration to soil and aquifers in case of spill — guaranteed environmental protection and compliance with Seveso III legislation and Environmental Liability Directive. Membriko performs a 24-72 hour flood watertightness test and issues a technical containment certificate for the Seveso licensing process (MAJOR HAZARD) with APA and IGAMAOT.
Continuous Base and Wall Coverage — No Interface Joints
EPDM installs as a continuous system covering bund base and walls without interface joints between different materials — eliminating the highest failure risk point of composite systems (concrete + geomembrane on base, plain concrete on walls). Full membrane continuity ensures no spilled product migration path to soil through joints or transitions.
Installation in Existing Bunds — No Demolition
EPDM installs over existing concrete, masonry, steel or epoxy-coated concrete — enabling regulatory compliance without demolition and reconstruction of existing bunds. Installation in existing concrete bunds is the most common scenario in rehabilitation of industrial installations built before Seveso III legislation (implemented in Portugal in 2007). The process includes surface preparation, adhesion primer and full bonding.
50+ Year Service Life — No Recoating Cycles
Epoxy coatings in chemical containment bunds have 10-15 year service life before inspection and reapplication. Each recoating cycle requires: process shutdown, bund emptying, cleaning and decontamination, surface preparation, epoxy application and cure (5-10 days), refilling. With EPDM, this operational disruption never occurs during 50+ years — the membrane is installed once and protects permanently.
Documentation for Seveso and APA Licensing
EPDM membrane in containment bunds is accepted by licensing authorities (APA, IGAMAOT, Seveso authorities) as a compliant technical solution. Membriko provides: CE technical data sheet, Declaration of Performance (DoP), chemical compatibility certificate for stored products, 24-72 hour watertightness test protocol, installation certificate and 15-year warranty — complete documentation for Seveso licensing (MAJOR HAZARD and LOWER-TIER).
Technical Specifications
Standard thickness — chemical containment
2.0 mm (EN 13492)
Elevated thickness — concentrated acids or hazardous
2.5 mm (EN 13492)
Dilute inorganic acid resistance
Excellent — HCl, HNO₃, H₃PO₄, HF (moderate concentrations)
Strong alkali resistance
Excellent — NaOH (up to 50%), KOH, concentrated NH₃
Saline solution resistance
Excellent — NaCl, Na₂SO₄, CuSO₄, FeCl₃
Aliphatic hydrocarbon resistance
Good — verify resistance datasheet for specific product
Elongation at break
≥ 300% (EN 12311-2)
Service temperature
-45°C to +80°C
Product standards
EN 13956 / EN 13492 (containment geomembranes)
CE marking
EN 13956 / EN 13492
NOT compatible products
H₂SO₄ > 30%, aromatic solvents, chlorinated hydrocarbons — verify datasheet
Validated products
500+ with resistance datasheet available
Installation Process
- 1
Product Audit and Chemical Compatibility Verification
Identification of all products stored in the bund area — trade names, chemical composition, maximum concentrations, pH and maximum operating temperature. EPDM compatibility verification for each product in the chemical resistance datasheet by product family. For products not covered by the standard datasheet, ASTM D471 immersion tests in the specific product. Thickness (2.0 or 2.5 mm) and system definition.
- 2
Bund Structure Inspection and Preparation
Structural inspection of existing concrete or steel bund — identification of cracks, delamination, chemical attack zones, sharp corners and irregularities. Crack repair by epoxy resin injection or polymer mortar. Rounding of sharp corners to minimum 50 mm radius — EPDM must not fold at right angles without transition. Verification of cleanliness and absence of grease, oil or contamination preventing adhesion.
- 3
Primer Application and EPDM on Base
Application of EPDM-compatible contact primer. 2.0 mm EPDM placement on bund base with full bonding — no air pockets that could create migration pathways in case of micro-crack. Base seams by certified QuickSeam vulcanisation tape or hot-air welding.
- 4
EPDM on Walls with Overlap and Anchoring
EPDM bonding on bund walls with minimum 200 mm overlap over base EPDM. Wall/base seam at rounded corner — critical point of the entire installation. EPDM anchoring at wall tops by stainless steel batten bar with top seal. Verification of full continuity without exposed interfaces between base and walls.
- 5
Singular Details: Drain, Sump and Penetrations
Base drain or sump installation with prefabricated EPDM sleeve and pressure flange — watertightness guaranteed at the highest accumulated spill risk point. Penetrations for pipes, level sensors and electrical cables with specific sleeves. Effluent collection system to isolated safety tank separate from general industrial drainage network.
- 6
Watertightness Testing and Certification for Licensing
24-72 hour flood watertightness test with water per DIN 1045-2 and Seveso licensing process requirements. Visual inspection during test. Complete photographic record. Issuance of technical containment certificate with: stored product identification, installed thickness, watertightness test result, 15-year warranty — documentation structured for Seveso licensing submission with APA and IGAMAOT.
Installation Techniques
Fully Bonded EPDM in Concrete Bund (Seveso Installations)
2.0-2.5 mm EPDM fully bonded to entire concrete bund base and walls by high-performance contact adhesive. Reference system for Seveso installations and containment of acidic, alkaline or high environmental risk products. Full bonding prevents spilled product migration under the membrane even in case of localised micro-crack.
Vantagens
- Certified containment for Seveso installations — complete documentation for APA/IGAMAOT licensing
- Full bonding prevents product migration under membrane — zero preferential drainage pathway
- Installable over existing epoxy-coated concrete (after mechanical keying) without demolition
- Compatible with integrated EPDM drainage system — sump, base drains and pipework
Desvantagens
- Requires regular, structurally sound concrete surface — severe chemical attack may require prior repair
- Adhesive application temperature > 10°C — schedule installation outside coldest months
EPDM in Earth Bund (Large Volume Containment)
For large-volume containment bunds (crude, biodiesel, anhydrous ammonia or liquid fertiliser tank farms), EPDM in earth-excavated bund with 1:2 (h:v) slopes. Protective geotextile 600 g/m² + 2.0 mm EPDM. Economical system per m³ of containment capacity for moderately aggressive products.
Vantagens
- Cost per m³ of containment far below concrete bunds for large volumes
- Fast installation in large bunds with standard geosynthetic equipment
- 300%+ elongation accommodates earth slope terrain irregularities
- Suitable for tank farms requiring 110% of largest tank volume (often >500 m³)
Desvantagens
- Not suitable for highly aggressive chemical products (concentrated acids, aromatic solvents)
- Slope soil must be stable and non-erodible — anti-erosion geotextile on slopes recommended
EPDM under Pavement in Transfer and Loading Zones
EPDM installation under concrete or asphalt pavement in loading and unloading platforms, chemical product transfer zones and fuel stations. EPDM membrane acts as a last-resort impermeable barrier under the pavement, routing any spill penetrating the surface layer to perimeter collection channels.
Vantagens
- Continuous, invisible protection under existing or new pavement
- Controlled spill routing to centralised collection system
- Suitable for heavy vehicle traffic zones when correctly protected
- Compliance with fuel storage installation legislation (DL 31/2006)
Desvantagens
- Direct membrane inspection not possible after pavement installation — spark test before overburden
- Localised damage repair requires pavement removal in affected zone
Comparison with Other Membranes
| Característica | EPDM | Plain concrete | Epoxy coating |
|---|---|---|---|
| Broad chemical resistance — acids and alkalis | Excellent (pH 2-12) — 500+ products validated with resistance datasheet | Poor — progressive acid attack; 10-20 year service life in acid environment | Good but brittle — fails from substrate cracking; reapplication every 10-15 years |
| Service life in aggressive chemical environment | 50+ years — no recoating or replacement cycles | 10-20 years with acid attack — progressive, silent deterioration | 10-15 years — 3-5 reapplications needed over 50 years |
| Ability to accommodate structural movement | 300%+ elongation — absorbs settlements, concrete cracking and thermal variations | < 5% elongation — brittle fracture over any substrate cracking | Rigidity that complicates installation in bunds with complex geometry |
| Documentation for Seveso licensing | Complete documentation — CE, DoP, watertightness test, installation certificate | No specific chemical resistance datasheet by product — regulatory acceptance questionable | Manufacturer documentation available but without systematic watertightness testing |
| Operational disruption during maintenance | Zero — no recoating needed during 50+ years | 5-10 working day shutdown per reapplication cycle (every 10-15 years) | Unpredictable shutdown when failure occurs — spill risk before damage detection |
| Installation over existing structure | Yes — over concrete, steel, masonry and existing epoxy coating without demolition | Complete demolition of existing bund — far higher cost and programme duration | Simpler installation in regular bunds but difficulty at corners and penetrations |
Performance in the Portuguese Climate
High-Concentration Industrial Zones (Sines, Setúbal, Estarreja, Aveiro)
Portugal's largest industrial zones concentrate petrochemical, chemical and refining installations subject to Seveso legislation. Sines (GALP and CUF petrochemical complex) and Setúbal (Sapec, Repsol) have dozens of installations with secondary containment bund obligations. Maritime corrosion in coastal environments adds an additional salt resistance requirement to EPDM — which resists saline solutions intrinsically.
Agro-Industry and Pesticide and Fertiliser Storage
Storage of pesticides, herbicides and liquid fertilisers (UAN, anhydrous ammonia, dilute nitric acid for fertilisers) at large agricultural operations and cooperatives — secondary containment required by phytosanitary legislation and DL 81/2013 (biocides). EPDM resists nitrogen-based fertilisers and many organophosphate pesticides within the compatibility envelope verifiable in the technical datasheet.
Logistics and Fuel Terminals (Hydrocarbons)
Fuel terminals and service stations with petrol, diesel, LPG and lubricant storage — EPDM containment per DL 31/2006 and petroleum product storage installation regulation. Note: EPDM has moderate resistance to pure aromatic hydrocarbons (toluene, xylene) and poor resistance to pure petrol — verify resistance datasheet for the specific product; for pure fuels, Membriko may recommend an alternative membrane.
Mining and Ore Processing (Iberian Pyrite Belt)
The Iberian pyrite belt (Aljustrel, Neves-Corvo, São Domingos) generates acid mine drainage (AMD) with pH 2-4 and high concentrations of Fe, Cu, Zn, As. AMD neutralisation and containment bunds require membranes resistant to dilute acids and metal sulphate solutions — EPDM resists these environments excellently. Note: copper sulphate (CuSO₄) at high concentrations — verify datasheet.
Pharmaceutical and Food Industry (Alkaline Products and Disinfectants)
Pharmaceutical (Sintra, Amadora, Setúbal) and food industries use strong alkalis (NaOH, KOH) for CIP (clean-in-place) cleaning and phosphoric and peracetic acid for disinfection. Containment bunds for CIP vessel areas and 30-50% NaOH storage — conditions where EPDM shows excellent resistance (NaOH does not attack the saturated EPDM polymer backbone at any concentration).
Frequently Asked Questions
EPDM resists dilute sulphuric acid (H₂SO₄ up to 30%) and dilute nitric acid (HNO₃ up to 20%) — concentrations adequate for most common industrial applications. For higher concentrations, resistance is limited and must be verified in the specific EPDM product technical datasheet, ideally with ASTM D471 immersion tests at the specific product concentration and operating temperature. For concentrated sulphuric acid (> 50%), EPDM is not the appropriate material — Membriko can recommend alternative membranes (FPP, CSPE) or specialist polymer coatings for these conditions.
Yes, provided: (1) the system is sized for 110% of the largest vessel volume in the protected area; (2) the EPDM membrane is certified (CE marking, EN 13492) and installation is documented; (3) a flood watertightness test certificate exists. Membriko's technical documentation includes all data needed for the Seveso licensing process (MAJOR HAZARD and LOWER-TIER) with APA and IGAMAOT, including a specific chemical compatibility certificate for the stored products.
Yes. The process includes: (1) existing epoxy coating adhesion assessment by pull-off test (> 0.5 N/mm²); (2) if adhering: mechanical abrasion to create roughness profile for EPDM adhesion; (3) application of compatible contact primer; (4) 2.0 mm EPDM installation by full bonding. If the existing epoxy coating is delaminated or with insufficient adhesion, it is removed by blasting or scarifying before EPDM installation. In both cases, concrete bund demolition is not required.
EPDM has limited or inadequate resistance to: (1) Pure aromatic hydrocarbons — toluene, xylene, benzene degrade EPDM by swelling and component extraction; (2) Pure aliphatic hydrocarbons at high concentration — petrol, diesel, hexane; (3) Chlorinated solvents — methylene chloride, trichloroethylene, perchloroethylene; (4) Concentrated sulphuric acid (> 30-50% depending on product) and fuming nitric acid. For these products, Membriko analyses the specific conditions and may recommend alternatives (FPP/CSPE for hydrocarbons, PVDF for highly concentrated acids). Technical honesty about material limitations is part of Membriko's value proposition.
Membriko's EPDM containment bund has a 15-year warranty and documented 50+ year service life, without recoating requirements. Recommended inspections are: (1) Annual visual inspection of the membrane for mechanical damage from impact, puncture or cut; (2) Cleaning of any sediments or incrustations that may hide damage; (3) Verification of perimeter anchoring and penetration sealing after seismic events or actual spill events. For localised damage, Membriko provides field repair kits with EPDM patches and QuickSeam tape — repair in hours without installation shutdown.
Duration depends on bund condition and size. For a typical industrial containment bund of 100-500 m² (covering 110% volume of 50-200 m³ tanks): surface preparation 1-2 days, EPDM installation 1-3 days, singular point installation (drain, penetrations) 0.5-1 day, watertightness test 1 day, certification issuance 1 day — total of 4-8 working days of bund operational shutdown. Membriko coordinates with the facility maintenance plan to minimise disruption to adjacent operations.
EPDM is an electrically non-conductive and chemically inert material — it does not participate in galvanic corrosion reactions. When installed over steel, EPDM protects the steel from contact with the electrolyte (spilled chemical product), interrupting the galvanic circuit. EPDM resistance to the specific chemical product is the determining criterion — not the presence of steel. For stainless steel bunds in pharmaceutical or food installations, EPDM is often specified over the steel as an additional containment barrier, especially at drainage zones and joints.
For products not covered by the standard EPDM chemical resistance datasheet, the verification process includes: (1) Identification of exact chemical composition, concentration, pH, maximum operating temperature and any contaminants; (2) Search in the chemical resistance database (Gestisoft, ASTM, EPDM manufacturer); (3) If inconclusive: ASTM D471 immersion test — EPDM sample immersed in the product at use conditions for 7 days, followed by measurement of hardness, elongation, tensile strength and volume change; (4) Acceptance criteria: mass change < ±5%, elongation change < -20%, hardness change < ±10 Shore A. Membriko conducts or supervises these tests and issues a compatibility declaration for the licensing process.
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