Hyundai Kia MS220-19 Thermoplastic Polyolefin (TPO)

The “Hyundai Kia MS220-19 Thermoplastic polyolefin (TPO)” standard, developed by Hyundai-Kia Motors Company, the oldest motor vehicle manufacturer in Korea, defines thermoplastic polyolefin (TPO) material for exterior parts.

Parts using thermoplastic polyolefin (TPO) shall comply with all requirements of the relevant assembly performance specification. The chemical composition and processing condition shall not be inappropriately changed, which may affect the quality of the parts. Before changing the chemical composition of the material, it is mandatory to consult with the department having the authority to enact the specification. The final parts made from this material shall be free from defects, uneven gloss, burn marks, warpage, silver lines, cracks, uneven color, flow marks, weld lines, sag marks or other defects.

This material shall be tested by the methods specified in the table titled “Detailed requirements” given in this standard and shall conform to the requirements stated in the table.

The detailed requirements in the table are given on the following basis:

• Material performance:
  • Specific gravity
  • Melt index
  • Tensile strength
  • Elongation
  • bending strength
  • Flexural modulus
  • Izod impact strength
  • Heat distortion temperature
  • Puncture impact behavior
  • Weather resistance
  • Fourier transform-infrared spectroscopy (FT-IR)
  • Thermal gravimetric analyzer (TGA)
  • Differential scanning calorimetry (DSC)
  • Prohibition of harmful substances
• Part performance: Paint
  • Adhesion
  • Water resistance
  • moisture resistance
  • Water jet resistance
  • Scratch resistance

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 test sample: Samples should be kept in the above-mentioned standard condition for at least 48 hours after being made.

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 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).

It must comply with the following standards in terms of flexural strength and modulus:

• “ISO 178 Plastics - Determination of flexural properties” (specimen size 80 × 10 × 4,0 mm, span length 64 mm, test speed: 2 mm/min).
• “ASTM D790-17 Standard test methods for flexural properties of unreinforced and reinforced plastics and electrical insulating materials” (specimen size 127 × 12,7 × 6,4 mm, Aperture length 100 mm, test speed 10 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 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.

The puncture impact behavior temperature must comply with the following standards:

• “ISO 6603 Plastics - Determination of puncture impact behaviour of rigid plastics” (specimen size 60 × 60 × 3 mm, test speed 4,4 m/s).
• “ASTM D 3763 Standard test method for high-speed puncture properties of plastics using load and displacement sensors” (specimen size 100 × 100 × 3, test speed: 3,3 m/s.

It must comply with the following standards in terms of linear thermal expansion coefficient:

• “ISO 11359 Plastics - Thermomechanical analysis (TMA)”.
• “ASTM E 831 Standard test method for linear thermal expansion of solid materials by thermomechanical analysis”.

In terms of weatherability testing, it must comply with the following standard:

• “MS210-06 Molded plastic parts - Outdoor use”

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 paintability testing, it must comply with the following standards:

• “MS655-15 Painting - External plastic parts”.
• “MS210-07 Water jet resistance test method for painted plastic parts”.

The Erichsen method is used for scratch testing (scratch tip radius 0,5 R, speed 1000 mm /min, applied load 10 N). It is recommended to perform the test using flat pieces cut from the actual part; if this is not possible, a flat sample with the same grain size as in mass production is used.

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