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Frequently asked questions and matters are summed up relating to our products and
recruitment process.

Page 1/1 9 Cases in total
NO. Subject
1 I would like to have your table of physical properties.

Please refer to Products > Products Guide section in our website

2 For what parts of household appliances can PP be used, and what are their advantages?

PP is mainly used for table fan stand, fan cover, nozzle, accessories & filter casing, etc. for vacuum cleaner, jar kettle body, water reservoir for steam iron, electric cooker cases, washing machine tube, etc. With its unique characteristics of light weight, low price, balance performance of impact strength and stiffness, and eco-friendly material, it can realize cost reduction of the parts and make them lightweight.  Currently, high-priced engineering plastic materials are being replaced on a continuing basis. The replacement speed is expected to increase dramatically if its physical properties are improved by high functionality through technology development.

3 Why is PP preferred for use in automobiles as compared with PVC?

PVC for automobiles is mainly used as interior skin material or for cables. For the production of PVC, phthalate plasticizers, oxidation stabilizers, lead, cadmium, etc., are used and since they emit hazardous substances such as dioxin, furan, etc. when incinerated, global PVC use is being phased out.  Particularly in case of EU, all imported cars are subject to regulations mandating compliance with more than 95% Recycle, Reuse, and Recover by 2015, compelling automakers to remove PVC completely from automobiles and expand the use of alternative materials. Accordingly, the use of PP-based materials with its superb competitiveness as an alternative in terms of price and performance is steadily increasing.

4 What is IZOD?

It is one of the methods that measure the impact strength in accordance with the US regulation ASTM D256. The most common way of measuring the impact resistance is to measure the energy required to destroy an injection-moulded specimen that has been made.  In other words, the IZOD impact test shows the energy required to destroy the notched or non-notched specimen under standard conditions and is indicated as the energy absorbed (ft•lb or kg•cm) per initial thickness (inch or cm) of the specimen.

5 What is MFR (PP)/MI (PE)?

As for the measurement method and conditions, they comply with US regulation ASTM D1238 where the weight of PP/PE is defined when it passes through an orifice with diameter of 2.095mm for 10 minutes under load of 2160g and at temperature of 230℃(PP)/190 ℃(PE). Other ways of measuring fluidity include Spiral Flow Length, etc.

6 What is PP?

PP is an abbreviation of polypropylene, which is synthetic resin made from the polymerization of propylene. Its areas of applications and usage show gradually increasing trend due to its excellent physical properties compared to its low price. Nowadays, specialized PP used for special purposes is being developed on a continuing basis with the development of new catalysts.

7 HDPE is used for moulding automobile fuel tank. Isn’t it more fragile than a steel fuel tank?

The advantages of using a plastic fuel tank are freedom in design, light weight, excellent durability, and stability. A plastic fuel tank does not break apart even if it falls from a height of 6m with anti-freezing solution at -40℃.  A plastic fuel tank is relatively safe compared to a steel fuel tank because in a traffic accident the steel fuel tank explodes, while on the other hand only gasoline-induced flames erupt from the plastic tank since the plastic just melts.

8 When moulding the lids of containers primarily used for the refrigerator, which material is better between PE and PP?

The normal freezer temperature is usually around -20℃, so for products to be used at low temperature, it is better to use polyethylene for its good low-temperature impact strength.

9 How is PE classified?

Based on the polymerization method and density of polyethylene, it is largely classified into low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), etc. The density of LDPE is 0.910~0.925kg/㎥, that of MDPE is 0.926~0.940 kg/㎥, and that of HDPE is 0.941~0.965 kg/㎥. The LLDPE is different from the rest three. Its structure is akin to HDPE, but it is more of α-olefin whose density has become low through copolymerization.