Processing of KOPEL-PEL 1. Injection of KOPEL The engineering elastomer KOPEL has similar performance as rubber, but nearly the same processing conditions for molding machines as crystalline resins. Therefore, general injection molding machines are used in processing KOPEL.

Select ----------- Fibers Chamude Industrial Materials Films Engineering Plastics Specialty Chemicals Purchasing Kumi Factory Kimchon Factory Kyoungsan Factory R&D ENPLA KOPA-PA6 KOPA-PA66 SPESIN-PBT KOPEL-PEL KOPET-PET NOPLA-PEN SPELLOY-ALLOY

<Table> Conditions of Injection Molding for Each Hardness ITEM UNIT KP3372 KP3363 KP3355 KP3340 Cylinder Temp RearZone Center Zone Front Zone ¡É 200~210 225~235 225~240 200~210 220~235 220~235 180~192 200~220 210~220 160~170 170~190 180~200 Nozzle Temperature ¡É 230~240 220~235 210~220 185~200 Mold Temperature ¡É 40~60 40~60 20~40 20~40 Molten Polymer ¡É 230~240 220~235 210~220 185~200 Screw RPM RPM 40~80 Injection/Holding press. Kg/§¨ 300~1,000 Back pressure Sec 50~400 Cycle Tine Injection Holding Sec 2~6 15~40 2~6 15~40 2~8 20~50 2~10 20~60  Injection Molding Machine : ENGEL 75ton(3oz)  Product : ASTM Specimen (Weight 41~46g)

	2. Advice for Molding   1-1. Injection speed is varied according to product form. For injection molding of KOPEL, it is best to set a slower injection speed compared with other crystalline resins given KOPEL's has higher rubber elasticity. If injection speed is too high, the molten state absorbs the injection pressure, which may adversely affect part design or injection conditions. For thin parts, cooling speed in the cavity is faster than that for thicker parts. If faster injection speed is applied to thicker parts, it may result in defective part production due to surface defects such as flow marks or jetting. 1-2.  When a screen filter is used for mixing or other purposes within the barrel case, it is advisable to use screen filters of the 60~120 mesh range. 1-3.  Moisture content must be maintained below than 0.1% Dry : 2~4 Hr-100~110¡É 1-4.  KOPEL has very low melting point compared with other resins, and it causes poor appearance when mixed with other resins. In order to prevent this, all parts of the machine (feeder, barrel and screw) must be kept clean and washed. Use of a screen filter between the die and barrel is very effective in screening out impurities, and it is also useful in maintaining flow stability of polymer melt. However, attention should be given to possible elevation of internal pressure in the barrel. 1-5. When a master batch is used for the inputting colorant or other specific additives, products that can be evenly melted or dispersed under injection molding conditions identical or similar to KOPEL should be used.

Chemical Effect Chemical Effect Acetic Acid Acetone Acetylene Aniline ASTM Oil #1 ASTM Oil #2 ASTM Reference Fuel A ASTM Reference Fuel B Benzene Butane Butyl acetate Carbon mono Oxide Carbon tetra Chloride Chloro Form Chlorosulphonic Acid Cyclo Hexane D.O.P Ethyl Acetate Ethyl Alcohol Ethyl Chloride Ethylene Dichloride Ethylene Glycol Ethylene Oxide Form Aldehyde Formic Acid Freon Gasoline Glycerin n-Hexane Hydrazine ¡Ü ¡Û ¡Ü ¡¿ ¡Ü ¡Ü ¡Ü ¡Ü ¡Û ¡Ü ¡Û ¡Ü ¡â ¡¿ ¡â ¡Ý ¡Ü ¡Û ¡Ý ¡¿ ¡¿ ¡Ü ¡Ü ¡Û ¡Û ¡Ü ¡Ü ¡Ü ¡Ü ¡¿ Hydro Chloric Acid Hydrogen Isopropyl Alcohol Mercury Methyl Alcohol Methyl Ethyl Keton m-Cresol Methylene Chloride Naphthalene Nitric Acid o-Chloro Phenol Per Chloro Ethylene Phenol Potassium Hydroxide Solutions Sea Water Silicone Grease Soapy Water Salt Water Sodium Hydroxide Steam 100¡É Steam 110¡É Sulfuric Acid 5% Sulfuric Acid 10% Toluene Trichloro Ethylene Triethanol Amine Water Water 100¡É Xylene ¡â ¡Ü ¡Ü ¡Ü ¡Ü ¡Ü ¡¿ ¡¿ ¡Û ¡¿ ¡¿ ¡¿ ¡¿ ¡Ý ¡Ü ¡Ü ¡Ü ¡Ü ¡Ý ¡Û ¡¿ ¡Ý ¡Û ¡Û ¡¿ ¡¿ ¡Ü ¡Û ¡Ý ¡Ü(very good resistance) > ¡Ý > ¡Û(good resistance) > ¡â > ¡¿(soluble)