Selection (Junior Cert Wood Technology): Revision Notes

Selection of Adhesives

Definitions

• Adhesive: A substance used for sticking objects or materials together.
• Material Compatibility: How well an adhesive works with a wood type or other material without problems.
• Environmental Conditions: The temperature and humidity around that might affect how adhesives work.
• Application Method: The way adhesives are applied.
• Bond Strength: The force needed to pull apart two surfaces that are glued together.

Guidelines for Selecting Adhesives

• Material Compatibility: Ensure the adhesive suits the wood type. P.V.A. works well for wood, while Epoxy resin is better for metals and plastics.
• Environmental Conditions: Consider temperature and humidity effects on the adhesive. Some conditions require special adhesives like extreme heat.
• Application Method: Choose a method based on the area size and detail needed, like brushing for P.V.A. or spraying for Contact adhesives.
• Bond Strength: Select adhesives based on the required strength. Use strong adhesives like Epoxy Resin for heavy-duty tasks; P.V.A. fits usual wood joins.

Detailed Factors for Adhesive Selection

• Material Compatibility:
  • P.V.A.: Great for wood-to-wood bonds, often used in schools.
  • Epoxy Resin: Best for metals and plastic.
  • Contact Adhesives: Suitable for laminates and veneers; not good for big joints.
• Environmental Conditions:
  • High temperatures can make adhesives set quicker; high humidity might slow it down.
  • Use adhesives that resist moisture or chemicals for outdoor use.

• Application Method:
  • Brushing: Precise for small, detailed work.
  • Spraying: Covers large areas evenly.
• Desired Bond Strength:
  • Pick adhesives based on needed bond strength. Epoxy Resin for strong, waterproof bonds; P.V.A. for lighter tasks.

Summary