Foundry Sands — Define “Adhesiveness” Precisely In moulding sand technology, what does the property called adhesiveness specifically refer to during mould preparation and pattern withdrawal?

Introduction / Context:
Foundry sands exhibit multiple properties that influence mould quality: permeability, cohesiveness, adhesiveness, plasticity, and strength. Distinguishing them prevents defects such as scabs, blows, or mould damage during pattern withdrawal and handling.

Given Data / Assumptions:

• Green sand moulding in cope and drag.
• Patterns are withdrawn after ramming, requiring the mould to retain shape and not crumble.
• Terminology follows standard foundry definitions.

Concept / Approach:
Adhesiveness is the ability of moulding sand to stick to surfaces of other bodies—chiefly the walls of the moulding box (flask) and the pattern. Cohesiveness, in contrast, is the mutual attraction causing sand grains to stick to each other (internal bonding). Confusing these leads to wrong remedies when defects occur.

Step-by-Step Solution:
Identify property asked: adhesiveness, not cohesiveness.Recall definition: ability to cling to flask/pattern surfaces.Map options: only the statement about clinging to moulding box sides matches.Thus, select option indicating adherence to mould walls.

Verification / Alternative check:
Property tables in foundry manuals explicitly separate adhesiveness (to other surfaces) from cohesiveness (grain-to-grain).

Why Other Options Are Wrong:
Gas evolution relates to moisture/volatile content and permeability.“Sand grains stick together” defines cohesiveness, not adhesiveness.Green strength is mechanical strength, not an adhesion property.

Common Pitfalls:
Treating poor adhesiveness with binders when the issue is actually low cohesiveness or improper moisture—always diagnose correctly.

Final Answer:
it cling to the sides of a moulding box