Injection molding of liquid silicone rubber - Quiz
  • 1. Which certification is mentioned in relation to LSR biocompatibility?
A) ISO 9001
B) USP Class VI
C) UL 94V-0
D) ASTM D2000
  • 2. What is the hardness range of LSR in Shore A?
A) 0 to 40
B) 10 to 50
C) 20 to 100
D) 5 to 80
  • 3. How does LSR react to fire?
A) It produces toxic fumes
B) It melts quickly
C) It is highly flammable
D) It is fire retardant
  • 4. Which of these is a sterilization method for LSR?
A) Steam autoclaving
B) UV bleaching
C) Liquid nitrogen freezing
D) Microwave heating
  • 5. What is a natural aesthetic property of LSR?
A) High gloss
B) Opacity
C) Transparency
D) Metallic finish
  • 6. Why is LSR suitable for components under the hood of a car?
A) Extreme temperature resistance
B) Magnetic properties
C) Low cost
D) Conductivity
  • 7. Which chemical substances does LSR resist?
A) None of the above
B) Strong solvents
C) Acids and alkali
D) Oils only
  • 8. How can LSR be described in terms of smell and taste?
A) Slightly bitter
B) Tasteless and odorless
C) Sweet smelling
D) Distinct chemical scent
  • 9. What is a key mechanical property of LSR?
A) Brittleness
B) Rigidity
C) Low elongation
D) High tear strength
  • 10. What makes LSR an appealing option for electrical applications?
A) Excellent insulating properties
B) Static generation
C) Conductivity
D) High magnetism
  • 11. Which agency standard is listed for LSR compliance?
A) OSHA Standard 1910
B) FDA 21 CFR 177.2600
C) EPA Section 5
D) CE Marking 2024
  • 12. How does LSR compare to other elastomers regarding bacteria growth?
A) It is resistant to bacteria growth
B) It must be coated to prevent bacteria
C) It promotes bacteria growth
D) It has no effect on bacteria
  • 13. What is the curing system used for high purity liquid silicone rubber?
A) Platinum cured.
B) Heat-activated sulfur cured.
C) Peroxide cured.
D) UV cured.
  • 14. Why is intensive distributive mixing required for liquid silicone rubber?
A) Because of its thermosetting nature.
B) Because it is a thermoplastic material.
C) To lower the melting point of the silicone.
D) To remove oxygen from the material.
  • 15. What percentage of the silicone family do silicone rubbers constitute?
A) 75%
B) 50%
C) 30%
D) 10%
  • 16. What property do methyl-groups provide to silicone rubber?
A) Hydrophobicity.
B) High solubility in water.
C) Increased transparency.
D) Conductive electrical properties.
  • 17. Which material is mentioned as a common substrate for overmolding silicone buttons?
A) Polypropylene
B) Nylon 6,6
C) Polystyrene
D) Polyethylene
  • 18. What is another name for supply drums?
A) Injectors.
B) Plungers.
C) Nozzles.
D) Mixers.
  • 19. Which of the following is a typical application for liquid silicone rubber?
A) Building insulation foam.
B) Bottle nipples.
C) Glass window panes.
D) Automotive tires.
  • 20. What side groups are present in the backbone of silicone rubber?
A) Carbonyl or hydroxyl.
B) Butyl or propyl.
C) Phenyl or ethyl.
D) Methyl or vinyl.
  • 21. What is the function of the injecting device?
A) Trimming excess material.
B) Storing the final product.
C) Curing the elastomer.
D) Pressurizing the liquid silicone.
  • 22. How are liquid silicone rubbers typically supplied?
A) Pre-vulcanized sheets
B) Loose powder
C) Barrels
D) Solid blocks
  • 23. What is the primary function of the static mixer in the LSR process?
A) Adding the catalyst
B) Cooling the material
C) Mixing the two components
D) Filtering impurities
  • 24. What process is typically used for hard silicone rubbers?
A) Injection molding
B) Blow molding
C) Transfer molding
D) Extrusion molding
  • 25. What physical property of liquid silicone requires perfect mould cavity seals?
A) Low vulcanization speed
B) Low viscosity
C) High density
D) High thermal conductivity
  • 26. What range of pressure is used to pump LSR liquids?
A) 10 - 100 psi
B) 50 - 200 psi
C) 500 - 5000 psi
D) 10000 - 20000 psi
  • 27. What piece of equipment is used to retard the curing process prior to mold introduction?
A) A chiller
B) A color injector
C) A vacuum pump
D) A static mixer
  • 28. When does the curing process begin for LSR?
A) After the heating cycle completes
B) Immediately once components are mixed
C) Before the static mixer stage
D) Once the material enters the mold
  • 29. Which of the following is an advantage of liquid silicone injection molding?
A) Low process repeatability
B) Short cycle time
C) High material waste
D) Requires manual trimming
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