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PVC Functional Surface
The PVC coating forms the primary waterproof surface. Formulation can be adjusted for flexibility, outdoor exposure, abrasion, color and project-specific performance requirements.
Engineered Flexible Containment Materials
Custom Fabrication & Material Supply
PVC Tank Liner Manufacturer for Custom Water & Industrial Containment
DERFLEX supplies reinforced PVC tank liner material and custom-fabricated liner systems for steel tanks, concrete tanks, water reservoirs, agricultural storage, aquaculture and selected industrial liquids. Projects can be engineered around tank geometry, liner thickness, reinforcement, seam layout and connection details rather than forcing one generic specification onto every tank.
Reinforced PVC Coated Polyester
HF / RF-Weldable Construction
Custom Tank Dimensions
Roll Material or Prefabricated Liner
OEM & Project Supply
Material + FabricationSupport from coated fabric selection through welded liner construction.
Custom FitRound, rectangular and irregular containment geometries can be evaluated.
Weldable SeamsPVC coated structures are suitable for high-frequency or compatible thermal welding methods.
Project-Based QCDimensions, material strength and weld quality can be defined in the purchase specification.
DERFLEX water-containment application
Reinforced flexible material is used to create a waterproof barrier between the stored liquid and the supporting tank or containment structure.
Application-Driven Selection
A Tank Liner Is a Containment System, Not Just a Sheet of PVC
Buyers searching for a PVC tank liner manufacturer typically need more than membrane rolls. The liner must fit the tank, tolerate hydrostatic loading, remain flexible during installation, form reliable welded seams and stay compatible with the stored medium. Pipe penetrations, drain points, corners, top-edge attachment and substrate condition can be as important as the nominal material thickness.
DERFLEX approaches these projects from the coated-fabric side and the fabricated-product side. The company already manufactures PVC coated polyester used for flexible water tanks and uses high-frequency welding for assembled containment products. That combination enables projects ranging from liner material supplied to local fabricators through to made-to-dimension flexible liner assemblies.
For professional procurement, the useful question is therefore not “Which PVC is cheapest?” but “Which PVC structure, reinforcement and fabrication method matches the liquid, tank geometry and installation environment?”
Important engineering note: PVC is not universally compatible with every chemical or fuel. Chemical resistance must be checked against the actual liquid, concentration, temperature and exposure duration before production.
Material Architecture
How a Reinforced PVC Tank Liner Is Built
A reinforced construction combines a liquid barrier with a textile reinforcement so the liner can handle fabrication, installation and in-service mechanical stress more effectively than unsupported film in many large-tank applications.
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High-Tenacity Polyester Base
A woven polyester reinforcement provides dimensional stability and helps carry tensile and tear loads across large panels, welded seams and handling points.
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Weldable Back / Surface Layer
The opposite coated face protects the reinforcement and supports compatible welding and fabrication methods for prefabricated liners, panels and accessories.
Performance Priorities
What Industrial Buyers Should Evaluate Before Ordering
Nominal thickness alone does not predict liner performance. A useful tank-liner specification links material properties with the tank and stored medium.
Water Impermeability
The coating and welded seam system should create a continuous barrier appropriate for the intended water or liquid-storage duty.
Tensile & Tear Strength
Reinforcement matters when the liner is large, suspended, folded for shipment or stressed around corners and attachment points.
Weld Integrity
Panel layout, weld width, process settings and operator control influence the reliability of prefabricated seams and site connections.
Flexibility at Temperature
The compound should remain practical for folding, fitting and service at the project's minimum and maximum operating temperatures.
UV / Outdoor Exposure
For uncovered tanks, the exposed top zone and any external liner areas need a formulation selected for sunlight and weathering exposure.
Chemical Compatibility
Compatibility should be reviewed for the exact liquid, concentration and temperature. Water service and aggressive process chemicals should not share an unverified generic specification.
Substrate Protection
Rust scale, bolt heads, concrete defects and sharp edges can puncture liners. Surface preparation and protective underlay may be required.
Connection Detailing
Pipe penetrations, outlets, drains and flanges need reinforcement and sealing details compatible with the liner and the tank hardware.
Typical Reference Configuration
PVC Tank Liner Material & Fabrication Options
The table below provides a practical starting point based on DERFLEX's existing reinforced PVC water-tank and coated-fabric capability. Final parameters should be confirmed against the project drawing and stored medium.
| Material Structure | High-tenacity polyester fabric with PVC coating on both sides |
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| Common Reinforcement | 1000D × 1000D polyester is available for heavy reinforced water-containment constructions; alternative structures can be evaluated |
| Reference Fabric Weight | 1200 g/m² for an existing DERFLEX flexible water-tank construction; project weight can be customized |
| Reference Thickness | Approximately 0.9 mm for an existing heavy-duty water-tank construction; other flexible-tank materials are available in different gauges |
| Reference Breaking Strength | Approx. 2600 / 2300 N per 5 cm for the referenced 1200 g/m² construction |
| Reference Tear Strength | Approx. 350 / 320 N for the referenced construction |
| Reference Temperature Range | Existing DERFLEX heavy PVC water-tank material is specified for approximately -40°C to +70°C |
| Fabrication | HF / RF welding and compatible thermal fabrication methods; seam design depends on liner geometry |
| Supply Format | Roll material, welded panels, made-to-dimension liners or flexible containment products subject to project scope |
| Color / Surface | Blue, grey, black and other custom colors can be evaluated according to production requirements |
| Accessories | Reinforced openings, flanges, drains, attachment hems and project-specific fittings can be discussed from drawings |
| Compliance | Required REACH, RoHS, potable-water, food-contact or project-specific documentation must be stated before quotation so the correct formulation can be selected |
Where PVC Tank Liners Are Used
Containment Applications Across Water, Agriculture & Industry
DERFLEX can support different buyer groups with liner material and fabrication options. The correct formulation depends on the stored medium and exposure conditions.
Steel Water Tanks
Flexible internal barriers for bolted or fabricated steel tanks where separating water from the metal shell can reduce direct wet contact and simplify refurbishment.
Concrete Cisterns
Prefabricated or site-connected liner systems for water containment where cracks, joints or porous substrates need an independent flexible waterproof layer.
Agricultural Storage
Farm water, irrigation buffer tanks, rainwater collection and selected liquid fertilizer applications after chemical compatibility review.
Aquaculture & Biofloc
PVC liner material for fish tanks, circular framed tanks, aquaculture basins and related water-management systems where cleanable flexible surfaces are preferred.
Industrial Process Water
Make-up water, wash water, selected wastewater and non-aggressive process liquids where the PVC formulation has been verified for the duty.
Secondary Containment
Custom panels and liner structures can be evaluated for pits, bunds or containment zones where flexible welded barriers are appropriate to the site design.
Material Compatibility
For Chemicals, Start With the Fluid — Not the Liner Color
A general-purpose PVC liner may be suitable for many water and mild industrial duties, but concentrated acids, alkalis, solvents, hydrocarbons, oxidizers and elevated temperatures can change the material-selection decision. Before production, provide the exact chemical name, concentration, temperature, contact duration and any cleaning chemicals.
If the medium is drinking water or food-related, identify the applicable regulatory or certification requirement for the destination market. A general industrial PVC liner should not be assumed to meet potable-water requirements without documentation for the specific formulation.
Define the Liquid
Water type, chemical name, concentration, additives and cleaning media.
Define Temperature
Normal operating temperature plus start-up, cleaning and seasonal extremes.
Define Exposure
Continuous immersion, intermittent contact, outdoor UV exposure and expected service cycle.
Verify Structure
Confirm PVC formulation, reinforcement and accessory materials are compatible as a system.
Confirm Documentation
List required test reports, declarations or market-specific approvals before purchase.
Approve a Reference
For repeat OEM programs, lock critical parameters and an approved sample where practical.
Custom Fabrication Workflow
From Tank Drawing to Prefabricated PVC Liner
A controlled design-to-fabrication process helps prevent the common problems caused by ambiguous dimensions, misplaced penetrations and unsuitable seam layouts.
Project Review
Confirm tank use, stored medium, geometry, operating environment and required documents.
Material Selection
Match PVC formulation, reinforcement, thickness and surface treatment to the duty.
Pattern & Seam Plan
Translate finished dimensions into cut panels, allowances, corners and weld positions.
Welding & Fittings
Fabricate panels and integrate approved reinforcements, openings, drains or attachment details.
Inspection & Packing
Check agreed dimensions and workmanship, then fold and pack to reduce installation confusion.
Manufacturing & QC
Why DERFLEX Fits OEM and Project-Based Tank Liner Procurement
The practical advantage is the ability to coordinate coated-fabric production, welded fabrication and buyer specifications within one supply program.
Material-Side Control
- DERFLEX manufactures PVC coated tarpaulin material used in flexible water-containment products.
- Reinforcement, coating weight, color and selected surface functions can be discussed at project stage.
- Batch testing can focus on agreed mechanical properties rather than appearance alone.
- Roll supply can support local fabricators that prefer to weld or install in their own market.
Fabrication-Side Capability
- High-frequency welding is already used by DERFLEX for flexible tank and coated-fabric assemblies.
- Custom dimensions and panel layouts can be developed from drawings and installation constraints.
- Finished liners can be packed for project installation instead of shipping only raw fabric.
- OEM buyers can align material, fabrication, branding and repeat-order specification in one program.
Installation Engineering
Common Failure Risks to Address Before the Liner Enters the Tank
Many liner problems begin at the tank surface or interface details rather than in the middle of the membrane.
Tank Preparation Checklist
- Remove sharp burrs, welding spatter, loose rust, protruding fasteners and concrete debris.
- Radius or protect sharp corners where the liner will be forced to bend under water pressure.
- Use compatible protective underlay where the substrate is rough or where concentrated point loading is possible.
- Confirm the liner can expand into corners without being suspended by pipework or hardware.
Penetration & Attachment Checklist
- Locate every inlet, outlet, drain and overflow on the approved tank drawing.
- Use reinforcement around flanges or penetrations when required by the load and geometry.
- Do not rely on an unapproved adhesive where a welded or mechanically clamped detail is required.
- Plan top-edge retention so liner weight and hydrostatic pressure do not concentrate stress at isolated points.
Product & Application Images
DERFLEX Flexible Water-Containment References
Existing DERFLEX project imagery demonstrates reinforced coated-fabric use across open containment, flexible bladders and aquaculture/water-storage environments.
Related DERFLEX Resources
Explore Adjacent Water-Containment Materials
These related pages help buyers compare finished flexible tanks, pond and aquaculture liners, and the coated-fabric platform used for custom fabrication.
PVC Tank Liner FAQ
Questions Procurement Teams Commonly Ask
What information does a PVC tank liner manufacturer need for a custom quote?
Provide tank shape, finished internal dimensions, stored liquid, concentration if chemical, operating temperature, indoor/outdoor exposure, tank substrate, pipe and drain locations, and any required certifications or test documents. Drawings are strongly recommended for irregular tanks.
Can DERFLEX make custom PVC tank liners instead of only supplying liner rolls?
DERFLEX manufactures PVC coated material and also has high-frequency welding capability used for flexible water-containment products. Depending on the project, supply can be discussed as roll material, welded panels or a prefabricated liner assembly.
What thickness should I use for a PVC tank liner?
There is no single correct thickness. Tank size, reinforcement, liquid, substrate condition, installation method and service environment matter. DERFLEX has existing heavy water-tank constructions around 0.9 mm / 1200 g/m², but final selection should be project-specific.
Can PVC tank liners be used in steel and concrete tanks?
Yes, flexible PVC liner systems are commonly used in steel and concrete containment when the material and attachment system suit the application. The tank surface must be prepared to remove sharp features, and protective underlay may be necessary on rough substrates.
Is a PVC tank liner suitable for chemicals?
It can be suitable for selected chemicals, but PVC is not universally resistant to every medium. Chemical name, concentration, temperature and exposure duration must be checked before confirming the formulation. For aggressive solvents or other incompatible media, a different polymer may be necessary.
Can a PVC tank liner be used for potable water?
Only when the specific liner formulation and supporting documentation meet the potable-water requirements applicable to the project and destination market. Do not assume a general industrial PVC liner is automatically potable-water certified.
Request Engineering-Oriented Quotation
Send DERFLEX Your Tank Drawing and Stored-Liquid Details
For a useful quotation, include dimensions, liquid type, temperature, exposure conditions, fittings and required compliance documents. DERFLEX can then review an appropriate reinforced PVC structure and fabrication scope.
Technical values shown are reference data from existing DERFLEX PVC water-tank material and may vary by formulation. Final specification, chemical compatibility, regulatory suitability and fabrication details should be confirmed in writing for each project.