For over 20 years our goal has been to create the safest water bottles available. Our experience and continual research has allowed us to study all types of material alternatives which could be used in a water bottle and meet our stringent criteria -

Safe
Durable
Flexible
BPA free
100% recyclable
The material which meets all these is food grade LDPE (Low-density polyethylene) #4.
WHAT IS LDPE # 4?

LDPE #4 is one of the safest plastics in use today
It is widely used in packaging that comes into contact with food products, such as the coating for milk cartons, honey and mustard.
HOW DO WE KNOW IT IS SAFE?

Our bottles and caps fully comply with US FDA and all European health standards, California Prop 65 and Japan Food Hygiene regulations
Our water bottles are independently certified by Intertek to ensure they meet both FDA and CE health standards
Our Purist bottles were further certified by the world leader in independent testing SGS, the results showed Purist is 100% safe to use under any conditions.
WHY WE DO NOT USE POLYPROPLENE?

Polypropylene is liable to degrade from exposure to heat and UV radiation such as that present in sunlight
Tupperware is made from polypropylene but it is highly recommended not to place Tupperware in a microwave because the risk of it having the material migrate into the food while it subjected to higher levels of heat
Bottles made of Polypropylene tend to be stiff and user unfriendly
With force, walls could easily be punctured
Bottle walls become semi-pliable when exposed to hot liquids
May retain or convey some odors or tastes

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