A resin supplier has suggested that a blow molder of polystyrene ...

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A resin supplier has suggested that a blow molder of polystyrene parts add 20 polyethylene to improve properties. What property differences would you expect? What processing differences would you expect?
 
  What will be an ideal response?

Question 2

Briefly describe five different casting techniques.
 
  What will be an ideal response?

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Answer to Question 1

There would be an expected increase in toughness and a better chemical resistance. For processing: reduce the screw speed in the extruder because the material will flow better and to ensure the right amount of material entering the mold.

Answer to Question 2

(1) Mold casting is when the casting resin is poured into a mold and forms the entire part. (2) Embedded is when an article is to be totally encased by the resin. The embedding technique uses a mold, similar to that used in mold casting, and suspends the article in the mold so that the resin fills the mold and completely surrounds the article. (3) Encapsulating is when an article is to be coated with resin but the final shape of the part is to be roughly the same as the coated article. Examples of this are painting and dip coating. (4) Cell casting is when the casting resin is poured between parallel glass plates separately by a gasket to retain the resin and set the thickness of the part. Sheets are typically made by this method or by the closely associated continuous casting method that uses two continuous stainless steel belts to define the surfaces of the sheets.

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Both answers were spot on, thank you once again

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Great! Please up vote