Quality of Hyundai Kia MS211-46 Unreinforced PA66 (Polyamide 66)

The quality of unreinforced PA211 (polyamide 46) compound is defined in the standard “Hyundai Kia MS66-66 Quality of Unreinforced PA66 (polyamide 66)” developed by Hyundai-Kia Motors Company, the oldest motor vehicle manufacturing company in Korea.

This unreinforced PA66 compound is classified into 5 types as shown in the table given in the standard. This material is used in injection molded parts of the vehicle as indicated in the drawings.

In the table titled “Types and application” the type classification is made as follows:

• Type A: General, easy removal, high crystallinity (belt clip, cable tie, holder).
• Type B: Heat resistance (box, hose assembly, connector).
• Type C1: General impact resistance (control valve, fuse box).
• Type C2: High impact resistance (bonnet support bar clip).
• Type D1: Wear resistance (door control lever).
• Type D2: Wear resistance (speedometer, driven gear shaft).

In terms of general requirements, 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 necessary to consult with the material and quality departments. The final parts made of this material should be free from defects, uneven gloss, burn marks, warpage, silver lines, cracks, uneven color, flow marks, weld lines, sink marks or other defects.

To determine the detailed requirements, this material is tested by the methods specified in the standard and must conform to the requirements specified in the table titled “Detailed requirements”.

The table below provides detailed requirements for the material:

• Specific gravity
• Pulling Power
• Elongation
• Bending strength
• Flexural modulus
• Izod impact power
• Heat distortion temperature
• Rockwell hardness
• Melting point
• Thermal aging (tensile strength change)
• Oil resistance - Tensile strength
• Oil resistance - Flexural strength
• Oil resistance - IZOD impact strength
• Moisture absorption rate
• Fourier transform-infrared spectroscopy (FT-IR)
• Thermal gravimetric analyzer (TGA)
• Differential scanning calorimetry (DSC)
• Dangerous materials

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 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 80,0 × 10,0 × 4,0 mm, span length 64 mm, test speed: 2 mm/min).
• “ASTM D 790 Standard test methods for flexural properties of unreinforced and reinforced plastics and electrical insulating materials” (specimen size 127,0 × 12,7 × 6,4 mm, test speed: 30 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”.

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).

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

• “ISO 11357 Plastics - Differential scanning calorimetry (DSC)”.
• “ASTM D3418-21 Standard test method for transition temperatures and enthalpies of fusion and crystallization of polymers by differential scanning calorimetry” (heating and cooling rate 20 degrees/min).

Thermal aging: The sample is placed in a temperature-controlled chamber at 1000 degrees for 140 hours. After thermal aging, the sample is subjected to tensile strength according to this standard.

Oil resistance:

• Tensile strength: The sample is immersed in transmission oil for 130 hours in an oven at 720 degrees. Then, the tensile strength and elongation test method is followed.
• Flexural strength: The test condition is the same as above. Then, the flexural strength and modulus test method is followed.
• Izod impact strength: The test condition is the same as above. Then follow the Izod impact strength test method.

It must comply with the following standard in terms of moisture absorption rate:

• “ASTM D570-22 Standard test method for water absorption of plastics”.

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

• FTIR spectroscopy: attenuated total reflection, measuring range 4.000 ~ 650 cm-1, scanning number 32 times).

In terms of thermal gravimetric analysis equipment (TGA), it must comply with the following standards:

• “ISO 11358 Plastics - Thermogravimetry (TG) of polymers”.
• “ASTM E1131-08 Standard test method for compositional analysis by thermogravimetry” (heating rate 20 degree/min, temperature range room temperature ~ 850 degree).

In terms of differential scanning calorimetry (DSC), it must comply with the following standards:

• “ISO 11357 Plastics - Differential scanning calorimetry (DSC)”.
• “ASTM D3418-21 Standard test method for transition temperatures and enthalpies of fusion and crystallization of polymers by differential scanning calorimetry” (heating and cooling rate 20 degrees/min).

Our organization has a strong staff that closely follows the developments in the world in the field of science and technology and constantly improves itself. Among the numerous test, measurement, analysis and evaluation studies provided for businesses in various sectors, there are also testing services within the scope of the "Hyundai Kia MS211-46 Unreinforced PA66 (polyamide 66) quality" standard.