Reefer Flexitanks — Sun Flexitanks

Two Configurations

Choose your configuration

Both Reefer Flexitank configurations share the same food-grade construction and key features — the key difference is container size, capacity, and intended use case.

Manufactured with multi-layered virgin food-grade polyethylene and a stitched polypropylene outer sleeve for strength and reliability during transport.
Designed to transport temperature-sensitive beverages and food-grade products — wine, juices, milk, and similar liquid cargo.
Fully recyclable and insured against manufacturing defects as standard.
More cost-effective than ISO-tank containers for bulk quantities.

Payload Advantage

vs Drums

+50% Higher

vs IBCs

+25% Higher

Container type

20' Reefer

Suitable Cargo

Wine Fruit Juices Milk Dairy Products Food-Grade Liquids Beverages Liquid Dairy

Valve Specification

3" Ball or Butterfly Valve — all components constructed with virgin, food-grade polypropylene. Includes glass-filled reinforced handle with locking pin.

Manufactured with multi-layered virgin food-grade polyethylene and a stitched polypropylene outer sleeve for strength and reliability during transport.
Product size: 3 × 5KL–8KL — three flexitanks per 40' reefer container, maximising volume on every shipment.
Ideal for regions with a shortage of 20' containers — allows flexitanks to be exported where 20' units are unavailable.
Fully approved with COA Code of Practice TG07, ISO 9001/2015, ISO 14001/2015, and materials testing to PAS 1008.

Payload Advantage

vs Drums

+50% Higher

vs IBCs

+25% Higher

Container type

40' Reefer

Configuration

3 × 5–8KL

Suitable Cargo

Wine Fruit Juices Milk Dairy Products Food-Grade Liquids Beverages

Optional EVOH/Aluminium Barrier

An additional EVOH/Aluminium layer can be stitched into the flexitank construction to protect from oxygen migration and prevent any transfer of taste or odour — available on request.

Additional Details

🔩 Valve

3" Ball / Butterfly Valve — food-grade polypropylene components throughout

Glass-filled polypropylene reinforced handle with locking pin

Low Pressure Test: 0.1 bar (30 sec)

High Pressure Test: 3.0 bar (30 sec)

🛡️ Protective Floor Sheets

Felt construction for container floor protection

Rubber-grip dots for higher stability during transport

Width: 2,400 mm / Length: 4,000 mm

Engineering Highlights

Key Features

Every Reefer Flexitank is built around three core engineering principles that set it apart from standard flexitanks.

🧪

Virgin Polyethylene

Constructed from the highest quality virgin, co-extruded polyethylene — fully compliant with food safety standards and ensuring zero contamination risk throughout transit.

☢️

Gamma Irradiation

Gamma ray sterilisation uses ionizing radiation to eliminate all microorganisms — bacteria, fungi, and parasites — by damaging their DNA. Essential for food-grade liquid cargo.

🛡️

Reinforced Bulkhead

A specially designed reinforced bulkhead system — comprising a wooden board and two foam barriers — guarantees structural stability and cargo safety throughout the entire journey.

Technical Data

Technical Parameters

Full material specification for PE Film and PP Outer Sleeve — both configurations tested to PAAS1008:2016.

20' Reefer — PE Film & PP Sleeve

Test Item	Inner/Outer	Outer Sleeve
Thickness	125μm × 1–2 layers	≥150 gsm
Tensile Strength	≥ 30 MPa	≥ 1,500 N/50mm
Elongation at Break	≥ 650%	≥ 15%
Tear Strength	≥ 11 N	≥ 500 N/50mm
Dart Impact	≥ 850 g	N/A
Operating Temp.	−25 to 60°C	N/A

40' Reefer — PE Film & PP Sleeve

Test Item	Inner/Outer	Outer Sleeve
Thickness	250μm × 1 layer	≥200 gsm
Tensile Strength	≥ 25 MPa	TD ≥ 2,500 / MD ≥ 1,500 N/50mm
Elongation at Break	≥ 650%	≥ 15%
Tear Strength	≥ 22 N	≥ 1,400 N/50mm
Dart Impact	≥ 1,200 g	N/A
Operating Temp.	−25 to 60°C	N/A

Construction

Material Specification

All materials are rigorously tested prior to construction and carefully selected by our technical design teams to ensure safety during loading, transport, and discharge.

20' Reefer Flexitank

Construction	Material	Specification
Inner Layer Film	LDPE + LLDPE + MLLDPE	125 micron × 1 layer
Outer Layer Film	LDPE + LLDPE + MLLDPE	125 micron × 2 layers
Outer Sleeve	High Fibre PP	≥150 gsm
Valve	Polypropylene	3" Ball or Butterfly

40' Reefer Flexitank

Construction	Material	Specification
Inner Layer Film	LDPE + LLDPE + MLLDPE	250 micron × 1 layer
Outer Layer Film	LDPE + LLDPE + MLLDPE	250 micron × 1 layer
Outer Sleeve	High Fibre PP	≥200 gsm
Valve	Polypropylene	3" Ball or Butterfly

Food Grade

Purpose-built for food safety

The Reefer Flexitank uses a unique combination of LDPE, LLDPE, and MLLDPE film layers — each selected for their food-grade compatibility and mechanical performance in refrigerated environments.

The 40' configuration uses a heavier 250 micron film specification and a reinforced ≥200 gsm outer sleeve, reflecting the greater structural demands of a larger, multi-unit container setup.

All materials comply with FDA regulations and are tested to PAAS1008:2016 standards. The 40' configuration is additionally approved to COA Code of Practice TG07 and ISO 22000 Food Safety Management.

Quality Assurance

Certified & Compliant

Reefer Flexitanks meet the most rigorous international food safety and quality standards — including ISO 22000 Food Safety Management.

Common Questions

Reefer Flexitank FAQ

Everything you need to know about transporting food-grade bulk liquids in refrigerated containers.

What is a Reefer Flexitank? +

A Reefer Flexitank is a food-grade flexible bulk liquid container designed specifically for use inside refrigerated (reefer) shipping containers. It allows temperature-sensitive liquids like wine, juice, and milk to be transported in bulk while maintaining a controlled cold chain throughout the journey.

What is the difference between the 20' and 40' configurations? +

The 20' Reefer Flexitank is a single unit designed for a standard 20-foot reefer container. The 40' configuration uses three separate flexitanks (each 5KL–8KL) inside a 40-foot reefer container, making it ideal for higher-volume shipments or for regions where 20-foot containers are in short supply.

What cargo types are suitable? +

Reefer Flexitanks are designed for temperature-sensitive, food-grade bulk liquids — including wine, fruit juices, milk, dairy products, and other beverages. They are not suitable for non-food or hazardous liquid cargo.

What is Gamma Irradiation and why does it matter? +

Gamma ray sterilisation is applied to the flexitank materials to eliminate all microorganisms — including bacteria, fungi, and parasites — by disrupting their DNA. This is a critical step for food-grade applications where cargo purity and contamination prevention are paramount.

How does it compare to ISO-tank containers? +

Reefer Flexitanks offer a significantly more cost-effective solution for bulk liquid transport compared to ISO-tank containers. They eliminate the cost of tank cleaning, return logistics, and depot storage, while offering 25% more payload than IBCs and 50% more than drums.

Is the optional EVOH/Aluminium barrier available on both configurations? +

The EVOH/Aluminium oxygen barrier layer is available as an optional addition on the 40' configuration and can be stitched into the flexitank construction to protect oxygen-sensitive cargo from migration, taste transfer, or odour contamination. Please enquire with our team for availability on the 20' configuration.

ReeferFlexitanks