Quality of Mudguards Made of KIA MS252-05 EVA (Ethylene Polyvinyl Acetate) Elastomer

The standard “KIA MS252-05 Quality of EVA (ethylene polyvinyl acetate) elastomer mudguards” developed by Hyundai-Kia Motors Corporation, the oldest motor vehicle manufacturer in Korea, describes a procedure for determining the quality of mudguards made of ethylene polyvinyl acetate (EVA) elastomer used to prevent the car body from being splashed by muddy water. This procedure also includes the alloy of ethylene polyvinyl acetate (EVA) with polyethylene (PE).

This specification is generally used for the application described in the table within the standard or specified in the engineering drawing. The part marking method shall comply with the standard “KIA MS201-01 Marking of materials for automotive parts”.

The general requirements in this standard are described as follows:

• Parts using this material must comply with all requirements of the relevant assembly performance standard.
• The chemical composition and processing conditions should not be changed inappropriately, which may affect the quality of the parts.
• Before changing the chemical composition of the material, it is mandatory to consult with the materials and quality control departments.
• Final parts made from this material must be free from defects, uneven shine, burn marks, warpage, silver streak, cracks, uneven color, flow marks, weld lines, sink marks or other defects.

This material is tested by the methods defined in the standard and must comply with the conditions specified in the table.

In general, the standard condition of the laboratory in the tests is 23 degrees plus/minus 2 degrees temperature and 50 percent plus/minus 5 percent relative humidity. The samples are tested 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.

The following standards are followed for 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 D1505-18 Standard test method for density of plastics based on density gradient”.

The following standard is followed for tensile strength and elongation:

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

The following standards are complied with for Izod 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).

The following standard is followed for hardness:

• “ASTM D2240-15 Standard Test Method for Rubber Property - Durometer Hardness.” Each test is performed with seven specimens and the average of the five values ​​is reported, excluding the highest and lowest value.

The following standard is complied with for weather resistance:

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

For gasoline resistance, the following standard is followed: Immerse a test sample in gasoline for 24 hours at room temperature. When removed, check for swelling and cracks. Three test samples should be used and there should be no swelling and cracks after the test.

The following standard is followed for Fourier transform-infrared spectroscopy (FT-IR) :

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

The following standards are followed for the thermal gravimetric analyzer (TGA):

• “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).

The following standards are followed for differential scanning calorimetry (DSC):

• “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).

For each test item described in this standard, the test report must be submitted to the relevant material team and quality control departments. Whenever materials, recycling and suppliers are changed, the test report must be submitted and approved.

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 test services in accordance with the standard of "KIA MS252-05 EVA (ethylene polyvinyl acetate) elastomer made of mudguards quality".