Understanding the anatomy of a flexitank is essential for Southeast Asian exporters. A typical flexitank consists of several critical components, each with multiple configuration options that impact performance, safety, and buyer acceptance.
Inner Liner (PE Film Layers): The innermost layer which directly contacts the liquid is typically made from 3-4 layers of co-extruded polyethylene film. Industry standard thickness ranges from 125-175 microns. More layers provide better puncture resistance and barrier properties. The inner layer must be food-grade certified (FDA, EFSA) for food and beverage applications.
Outer Layer (Woven PP): The outer protective layer is made from high-density woven polypropylene fabric, typically 175-225 grams per square meter. This layer provides structural integrity, protects the inner PE film from abrasion during transport, and includes lifting straps for handling.
Valve System: The discharge valve is critical for safe, controlled liquid release. Industry standard is a 3-inch (76mm) ball valve with camlock connection. Some configurations include a top air release valve with 3-meter hose for pressure equalization during filling and discharge.
Capacity Range: Standard flexitanks fit 20-foot containers and offer capacities from 14,000 to 27,000 liters depending on liquid density, temperature, and container dimensions. Optimal capacity selection depends on the specific liquid being transported [3][4][5].
Flexitank Material Configuration Options Comparison
| Component | Standard Option | Premium Option | Cost Impact | Best For |
|---|
| PE Inner Layers | 3-layer co-extrusion, 125 microns | 4-layer co-extrusion, 175 microns | +15-20% | High-value liquids, long-distance shipping |
| PP Outer Layer | 175 g/m² woven PP | 225 g/m² HD woven PP | +10-15% | Rough handling, multiple transshipments |
| Valve Type | 3-inch ball valve, camlock | 3-inch valve + top air release valve | +8-12% | Viscous liquids, temperature-sensitive products |
| Capacity | 16,000-20,000L standard | 24,000-27,000L optimized | +5-10% | Low-density liquids, volume-optimized shipping |
| Certification | FDA, ISO 9001 | FDA, EFSA, Kosher, Halal, COA | +20-30% | Food & beverage, pharmaceutical, religious markets |
Source: Industry specifications from Techno Group, Flexitank Group, Fluid Flexitanks
[3][4][5]. Cost impact is approximate and varies by supplier.
Working Temperature Range: Standard flexitanks operate safely between -20°C to +60°C. Premium configurations with enhanced PE formulations can extend this to -30°C to +60°C. For viscous liquids (like oils, syrups, or certain chemicals), buyers may require heater pads—electric heating elements placed between the flexitank and container walls to maintain liquid flow during discharge.
Certification Requirements: Certification is non-negotiable for most B2B buyers. Minimum requirements include:
- FDA (US Food and Drug Administration) for food-grade applications
- ISO 9001 for quality management systems
- COA (Certificate of Analysis) for each production batch
- Kosher/Halal certification for Middle Eastern and religious markets
- EFSA (European Food Safety Authority) for EU buyers
- CIQ (China Entry-Exit Inspection and Quarantine) for certain Asian markets
Missing certifications will immediately disqualify your products from consideration by serious buyers [4][5][6].