Hyundai Kia MS231-10 High Density Polyethylene (HDPE) Molding Compound

Developed by Hyundai-Kia Motors Company, the oldest motor vehicle manufacturer in Korea, the material defined in the standard “Hyundai Kia MS231-10 High-density polyethylene (HDPE) molding compound” is a high-density polyethylene (HDPE) molding compound suitable for injection, extrusion and blow molding.

This specification is generally used for the application described in the table given in the standard or for the application specified in the engineering drawing. The table includes the types, classification and field of application as follows:

• Type A: Injection / extrusion (screw plug, gasket, cover plates)
• Type B: Extrusion / blowing (heater vent connectors)
• Type D: Injection (buffer lip)
• Type E: Injection (ground under cover)
• Type F: Blowing (foaming) (air duct)

The requirements of each material property were determined by a statistical method.

In general, parts using this material must comply with all requirements of the relevant assembly performance specification. The chemical composition and processing conditions that may affect the quality of the parts should not be changed inappropriately. Before changing the chemical composition of the material, it is mandatory to consult with the material and quality control department. The final parts made of this material should be free from defects, uneven luster, burn marks, warpage, silver lines, cracks, uneven color, flow marks, weld lines, sink marks or other defects.

This material is tested by the methods specified in this standard and must comply with the requirements specified in the table titled “Required material properties” given in the standard.

The table below provides detailed requirements for each type:

• Material performance:
  • Specific gravity
  • Melting point
  • Melting index
  • Pulling Power
  • Elongation
  • Izod impact power
  • Vicat softening point
  • Heat distortion temperature
  • Shore hardness (D scale)
  • Rockwell hardness (R scale)
  • Dupont impact force
  • Thermal conductivity
  • Fourier transform-infrared spectroscopy (FT-IR)
  • Thermal gravimetric analyzer (TGA)
  • Differential scanning calorimetry (DSC)
• Piece
  • View
  • Specific gravity
  • Melt index
  • Shore hardness (D scale)
  • Rockwell hardness (R scale)
  • acid resistance
  • Fade resistance
  • Weather resistance
• Flammability
• Heavy metals and harmful substances

In general, tests are performed in the following environment:

• The standard condition of the laboratory is 23 degrees plus/minus 2 degrees temperature and 50 percent relative humidity/minus 5 percent relative humidity.
• Standard condition of the test sample: Tests are performed on the samples immediately after a conditioning period of at least 48 hours in the standard condition specified above, at least 24 hours after molding.

It must comply with the following standards in terms of specific gravity:

• “ISO 1183-1 Plastics - Methods for determining the density of non-cellular plastics - Part 1: Immersion method, liquid pycnometer method and titration method”.
• “ASTM D792-08 Standard test methods for density and specific gravity (relative density) of plastics by displacement”.

It must comply with the following standards in terms of melting point:

• “ISO 3146 Plastics - Determination of the melting behaviour (melting temperature or melting range) of semi-crystalline polymers by capillary tube and polarizing microscope methods”.
• “ASTM D 2117 Standard test method for melting point of semicrystalline polymers by hot stage microscopy”.

It must comply with the following standards in terms of melt index:

• “ISO 1133-1 Plastics - Determination of melt mass flow rate (MFR) and melt volume flow rate (MVR) of thermoplastics Part 1: Standard method”.
• “ASTM D1238-13 Standard test method for melt flow rates of thermoplastics by extrusion plastometer”.

It must comply with the following standard in terms of tensile strength and elongation:

• “ISO 527-1 Plastics - Determination of tensile properties”.

In terms of sample type, it must comply with the following standards:

• “ISO 3167 Plastics - Multi-purpose test specimens” (specimen type Type A, test speed 50 mm/min).
• “ASTM D638-14 Standard test method for tensile properties of plastics” (specimen type Type 1, test speed: 50 mm/min).

Izod must comply with the following standards in terms of impact resistance:

• “ISO 180 Plastics - Determination of Izod impact strength” (sample type Type A, sample size 80 × 10 × 4,0 mm (notched), hammer 2,94 J).
• “ASTM D256-23 Standard test methods for determining the Izod pendulum impact resistance of plastics” (specimen size 63,5 × 12,7 × 6,4 mm (notched), hammer 2,94 J).

It must comply with the following standards in terms of VICAT softening point:

• “ISO 306 Plastics - Thermoplastic materials - Determination of Vicat softening temperature (VST)”.
• “ASTM D 1525 Standard test method for Vicat softening temperature of plastics” (ratio A, applied load: 9,8 N).

It must comply with the following standards in terms of thermal distortion temperature:

• “ISO 75-1 Plastics - Determination of deflection temperature under load” sample size 80 × 10 × 4,0 mm, flat method, tensile load: 0,45 MPa)”.
• “ASTM D648-06 Standard test method for deflection temperature of plastics under bending load in axial position” specimen size 127 × 12,7 × 6,4 mm, tension load 0,45 MPa”.

It must meet the following standards in terms of Shore hardness:

• “ISO 868 Plastics and ebonite - Determination of indentation hardness by means of a durometer (Shore hardness)”.
• “ASTM D 2240 Standard test method for rubber properties - Durometer hardness”.

It must meet the following standards for Rockwell hardness:

• “ISO 2039-2 Plastics - Determination of hardness - Part 2: Rockwell hardness”.
• “ASTM D 785 Standard test method for Rockwell hardness of plastics and electrical insulating materials” (specimens R Scale).

Dupont must comply with the following standard for impact resistance:

• JIS K 5600-5-3 Test methods for paints - Part 5: Mechanical property of film - Part 3: Drop weight test”. Conditions include:

It must comply with the following standard for Fourier transform-infrared spectroscopy (FT-IR):

• “MS200-61 Test standard - Plastic standard analysis”.

In terms of thermal gravimetric analyzer (TGA), it must comply with the following standard:

• “MS200-61 Test standard - Plastic standard analysis”.

For differential scanning calorimetry (DSC), it must comply with the following standard:

• “MS200-61 Test standard - Plastic standard analysis”.

In terms of thermal conductivity, it must comply with the following standard:

• “ASTM E1461-13 Standard test method for thermal diffusivity by the flash method”.

It must comply with the following standard in terms of flammability:

• MS300-08 Standard test methods for interior materials-flammability resistance” (sample thickness 2mm)

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