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LocknLock Story

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LocknLock Story

What material is used in LocknLock Plastic tableware?

We can hardly find anything in which plastic has not been used. The material we call “Plastic” actually has quite a variety of types. There are 38 plastics approved for food containers included in “cooking utensils, containers and packaging” by Korea Food & Drug Administration such as Polypropylene (PP) and Polyethylene (PE). Among all, LOCK&LOCK uses Polypropylene (PP) and Tritan™ as main materials for our products.

Material ranking used for food container and packaging

Plastic 84%, Metal 8.2%, Glass 5.0%, Paper 1.1%, Rubber 0.9%

Material ranking used for plastic tableware and packaging

polyethylene (PE) 46.3%, Polypropylene (PP) 35.1%, PET (PET) 15.4%, Polystyrene (PS) 1.4%

①Polypropylene (PP)

Polypropylene (PP) is approved plastic for food container by Korea Food & Drug Administration, which is irrelevant to Endocrine Disrupting Chemicals (EDCs). It is translucent, appropriate and very useful to use for food containers in the kitchen with the temperature of -20℃~120℃. For such reason, it is widely used as storage container for refrigerator or microwave. Its impact resistance is also outstanding, which makes it safe to use at home with children as it does not break easily.


Tritan™ is a new material developed by the worldwide chemical company from United States, Eastman Chemical. Its brand name is Tritan™ and its chemical name is “Polycyclohexane 1, 4 Dimethylterephthalate”. It is a pure Polyester material without any harmful plasticizer added including a suspected EDC, Bisphenol A. Its safety has already been approved by the U.S. Food and Drug Administration (FDA), Europe NSF, Japan Department of Health and Human Services. It is as clear as glass, has a great durability that is free from damages in a daily life, and hardly soaks or absorbs the liquid. It is very light weighted and can be sanitized in boiling water, which is why it is mainly used for feeding bottle, water bottle or food container. There is a very little Carbon dioxide emission in the manufacturing process and recyclable.

2. LOCK&LOCK Plastic Tableware Features

① Astonishing Sealing

LOCK&LOCK airtight containers have “Hollow cylinder silicon” and “4 sides interlocking” that locks twice, presenting the most astonishing sealing power compared to other brand products.

② Excellent Durability

With “Hinge (folding part of the lid wings)” and patent technology of “Blocking hole” of LOCK&LOCK, our airtight containers show an excellent durability that guarantees more than 3 million times of open and close. They can also withstand rapid temperature change such as rapid freezing or defrosting that makes it usable in the microwave and dishwasher, giving a great convenience to users.

③ 40% increase in Space Efficiency

LOCK&LOCK airtight containers are excellent for efficient space organization as scientifically designed from the product development stage such as stacking upward and to the side. You can enjoy maximum 40% of more space in your refrigerator by using and organizing with LOCK&LOCK airtight containers.

④LOCK&LOCK Quality achieves recognition in Europe

Öko Test in Germany: LOCK&LOCK graded as the First Class! Öko Test, known as the leading consumer report in Europe has conducted an examination among airtight containers of 15 brands from all over the world including Germany, Italy, Swiss, United States and China. They carried out such a thorough evaluation in 12 fields such as △Safety of material, △Sealing power, △Durability, △Open/close function of lid, △Microwave usability, △Heated food storage ability, △Condition of food when taken out of container, △Product discoloring test and △Easiness of Cleaning. As a result, “LOCK&LOCK” has been selected as one of the First Class (seht gut) brand out of two winners.

3. Q&A on Plastic tableware

① Will there be BPA(Bisfenol A) created when hot food touches the plastic tableware?

The only material related to EDCs out of all plastics used for kitchenware or tableware is 1 type of PC out of 38 types of plastic under Korea Food & Drug Administration management. Main materials used in plastic cooking utensils or containers in Korea are Polyethylene (PE) and Polypropylene (PP). They do not contain any suspected EDCs such as Phthalate or Bisphenol A. Therefore, there will be no BPA(Bisfenol A) generated in plastic tableware even when it is in contact with or has very hot food in.

② What does the number written on the bottom of plastic products mean?

It represents the classification of plastics by material by International Standard Organization (ISO) for recycling purpose. Number 7 (also written as “Others”) in particular, represents the group of new materials that are not commonly used, in which plastics that do not contain bisphenol A, a suspected EDC are belong.
※ Recycling mark has nothing to do with environmental hormone

4. An incredible true story with LocknLock

Mary Dreyfus was living a peaceful life in a beautiful town of Texas Santa Fe. One day, a horrific hurricane IKE landed sweeping through Texas in September, 2008. Only destruction and devastation had left after IKE. It resulted in more than 100 of casualties and property damage worth 27 billion dollars. Many people had to survive depending on the relief and aid. However, there was one single item that survived from such a terrible hurricane that took away everything. It was some bread and snacks stored in LOCK&LOCK. Dreyfus managed to survive for 15 days, eating “fresh” bread and snacks she stored in LOCK&LOCK until the rescue came. She wrote her amazing story in a thank-you letter and sent it to LOCK&LOCK. It is an incredible true story that the perfect quality of LOCK&LOCK saved precious lives in an unimaginable situation.

Thank-you letter from Mary Dreyfus