Unlike single-use flexitanks built for transport, the Sun Storage Tank is a reusable pillow tank designed to hold large volumes of liquid on site — at plants, depots, construction sites and remote operations.
Every Sun Storage Tank is manufactured and tested to recognised DIN standards across construction, fabric performance and valve assembly.
| Construction | Material | Specification |
|---|---|---|
| Base Fabric | High strength polyester | 1.3mm × 1 layer |
| Coating | TPU | 1.3mm × 1 layer |
| Product Size | — | 12 × 8.5 × 1 m |
| Capacity | — | 100 KL |
| Weight | — | 450 ± 10 kg |
| Valve | PP / Polypropylene | 3" Ball / 3" Butterfly |
The tank body is a single layer of high strength polyester base fabric with a TPU coating — a combination chosen for its abrasion resistance, flexibility at low temperature and long service life across repeated fill and drain cycles.
At 1.3mm thickness the material is substantially heavier than single-use flexitank film, which is what allows the tank to be drained, folded, moved and redeployed rather than disposed of after one use.
| Test Item | Test Basis | MD (Warp) | TD (Weft) |
|---|---|---|---|
| Tensile Strength | DIN EN ISO 1421-1 | ≥6000 N/5cm | ≥5700 N/5cm |
| Tear Strength | DIN 53363 | ≥750 N | ≥660 N |
| Adhesion Strength | DIN 53357 | ≥360 N | |
| Resistant to Cracking | DIN EN 1876-1 | −40°C | −40°C |
| Hardness | — | 55 PHR | 55 PHR |
| Operating Temperature | DIN EN 1876-1 | +90°C ~ −40°C | |
Tensile strength exceeding 6000 N/5cm in the warp direction gives the tank the structural capacity to hold 100,000 litres without deformation at the seams or base.
Crack resistance is verified to −40°C under DIN EN 1876-1, making the tank suitable for cold climate deployment as well as high ambient temperature environments up to +90°C.
| Valve Type | OD (Outer) | ID (Inner) | Weight |
|---|---|---|---|
| 3" Butterfly Valve | φ91 mm | φ63 mm | 1.8 kg |
| 3" Ball Valve | φ91 mm | φ53 mm | 1.7 kg |
Both valve types are manufactured from PP (polypropylene) and share a common 91mm outer diameter, so either can be specified without changing the tank fitting.
The butterfly valve offers a larger 63mm bore for faster fill and drain rates. The ball valve, at 53mm, gives finer flow control and a more positive shut-off — the right choice depends on your pumping setup and how frequently the tank is cycled.
Storage tanks solve the problem of holding large liquid volumes in places where building permanent tankage makes no commercial sense.
Sun Flexitanks products are manufactured, tested and certified to the highest international quality standards.
What to know before specifying a storage tank for your site.
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More answers in our frequently asked questions, or read about Sun Flexitanks and our 20+ years in bulk liquid transport.
Talk to our team about capacity, valve configuration and delivery for your location.
