Material Specialist

Material Specialist Interview Questions and Answers

Updated 14 Nov 2024

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Q1. Zipper recipe = Ldpe resin grade (24FS40) from reliance(84%)having MFI - 3 gm/10 mint + (Elite 5401G) from DOW chemical ( polyolefin elastomer) (used to increase tear strength , tensile strength , sealing ,flex...

Ans.

The zipper recipe consists of LDPE resin, polyolefin elastomer, masterbatch, enhanced polyolefin plastomer, and slip agent for various properties.

LDPE resin grade (24FS40) from Reliance is used for the main extruder machine
Elite 5401G from DOW Chemical is added to increase tear strength, tensile strength, sealing, and flexibility
Affinity 1450 from DOW Chemical is used for coating in the side extruder machine
Avient fast slip agent is added to reduce friction and provide slippe...read more

Q2. For PP resin ( random copolymer grade ) (221 , 121 ) - 59.3% and slip agent - 0.7% and Elite 5401G - 9.6% and affinity 1450 - 30% and Plastic processing aid (ppa) from Avient - 0.4% .

Ans.

The composition of PP resin (random copolymer grade) and various additives is provided for analysis.

PP resin (random copolymer grade) makes up 59.3% of the composition
Slip agent comprises 0.7% of the composition
Elite 5401G makes up 9.6% of the composition
Affinity 1450 comprises 30% of the composition
Plastic processing aid (ppa) from Avient makes up 0.4% of the composition

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Q3. What is ductility, hardnesa

Ans.

Ductility is the ability of a material to deform under tensile stress without breaking, while hardness is the resistance of a material to deformation or scratching.

Ductility refers to the ability of a material to be stretched into a wire without breaking.
Hardness is the resistance of a material to indentation or scratching.
Ductile materials include gold, copper, and aluminum.
Hard materials include diamond, steel, and ceramics.