Adhesives in construction: Dextrin is best classified as which type of glue or adhesive?

Difficulty: Easy

Correct Answer: Starch glue (dextrin from starch)

Explanation:


Introduction / Context:
Dextrin is widely used in paper packaging, labelling, and light carton sealing. For civil engineers and architects, knowing adhesive categories helps in specifying safe, economical products for non-structural applications such as tiles, packaging, or temporary fixtures.


Given Data / Assumptions:

  • Dextrin is produced by partial hydrolysis of starch.
  • Applications are typically light-duty and water-soluble.
  • We are not discussing structural epoxies or construction mastics here.


Concept / Approach:
Dextrin solutions form film-forming starch glues. They are plant-based, economical, and suitable where high strength or water resistance is not essential. This differentiates them from animal glues (collagen-based), albumin glues (protein from blood/egg), and rubber-based contact adhesives.


Step-by-Step Solution:
Identify origin: dextrin from starch → polysaccharide fragments.Match to category: starch glue family.Exclude other types: animal or albumin glues are protein-based; rubber adhesives are solvent-borne elastomer systems.Hence, the answer is “Starch glue (dextrin from starch).”


Verification / Alternative check:
Material data sheets list dextrin glues as water-soluble starch-based adhesives.


Why Other Options Are Wrong:
Animal/albumin glues differ in chemistry and performance (setting, moisture resistance).Rubber adhesives provide different bonding mechanisms and solvent handling.


Common Pitfalls:
Expecting high water resistance from dextrin; it is intended for dry-service light bonds.


Final Answer:
Starch glue (dextrin from starch)

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