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Worksheets2.3.5 (b) Adhesives
Total questions: 10
Worksheet time: 5mins
Which type of adhesive is most suitable for bonding car body panels in automotive assembly, considering its fast curing and moisture resistance?
Polyurethanes
Water-Based Adhesives
PVA (Polyvinyl Acetate)
Epoxy Resins
Compare solvent-based and solvent-free adhesives in terms of safety and curing time. Which statement is correct?
Solvent-based adhesives are safer and cure faster than solvent-free adhesives.
Solvent-free adhesives are safer but have a longer curing time than solvent-based adhesives.
Both types have equal safety and curing time.
Solvent-based adhesives are safer and have a longer curing time than solvent-free adhesives.
A student needs an adhesive for a school project that is easy to use, non-toxic, and inexpensive. Which adhesive should they choose?
Epoxy Resins
PVA (Polyvinyl Acetate)
Polyurethanes
Solvent-Based Adhesives
Given the need to bond metal to plastic in electronics, which adhesive would be most appropriate, and what is a key consideration when using it?
Water-Based Adhesives; ensure high moisture resistance
Epoxy Resins; requires precise mixing and curing
Polyurethanes; avoid toxic fumes
Solvent-Free Adhesives; allow for longer curing time
A manufacturer is deciding between water-based and solvent-based adhesives for bookbinding and shoe manufacturing. What strategic factors should they consider regarding environmental safety and drying time?
Water-based adhesives are flammable and dry quickly, while solvent-based adhesives are non-toxic and slow to dry.
Water-based adhesives are non-toxic and slow to dry, while solvent-based adhesives are flammable and quick to set.
Both adhesives are equally safe and have similar drying times.
Solvent-based adhesives are non-toxic and slow to dry, while water-based adhesives are flammable and quick to set.
Explain why adhesives are replacing mechanical fasteners in automotive design.
Because adhesives are less expensive than mechanical fasteners.
Because adhesives provide better weight distribution and reduce stress concentrations.
Because adhesives are easier to remove than mechanical fasteners.
Because adhesives are always stronger than mechanical fasteners.
List two advantages and two disadvantages of using epoxy resin.
Advantages: Fast drying, low cost; Disadvantages: Weak bond, non-waterproof.
Advantages: Strong bond, chemical resistance; Disadvantages: Long curing time, brittle when cured.
Advantages: Flexible, easy to clean; Disadvantages: Expensive, melts easily.
Advantages: Transparent, lightweight; Disadvantages: Flammable, short shelf life.
Give one real-life example of contact adhesive and explain why it is suitable.
Example: Laminating kitchen worktops; Suitable because it provides an instant bond for large surface areas.
Example: Gluing paper; Suitable because it dries slowly.
Example: Attaching car tires; Suitable because it is heat resistant.
Example: Sealing windows; Suitable because it is waterproof.
Compare solvent-based and solvent-free adhesives in terms of safety and performance.
Solvent-based adhesives are safer and perform worse than solvent-free adhesives.
Solvent-based adhesives have strong fumes and are harder to reposition, while solvent-free adhesives are safer and easier to use.
Solvent-free adhesives are more dangerous and less effective than solvent-based adhesives.
Both types have identical safety and performance characteristics.
Why is PVA not suitable for outdoor furniture?
Because PVA is waterproof and attracts insects.
Because PVA is not weather-resistant and breaks down in outdoor conditions.
Because PVA is too expensive for outdoor use.
Because PVA is toxic when exposed to sunlight.
