Plastics which do not get easily deformed on heating are known as:

Appeared in: NHM MP Staff Nurse-2022

Explanation

Thermosetting plastics are polymers that become irreversibly rigid when heated during the manufacturing process.
This initial heating, called curing, causes the polymer chains to form strong, permanent cross-links.
Due to this rigid, cross-linked 3D structure, the plastic cannot be softened or remelted by subsequent heating, making it resistant to deformation.
Common examples include Bakelite (used in electrical switches) and epoxy resins (used in adhesives), which are valued for their heat resistance and durability.

Option A: This is the opposite of the property described in the question. Thermoplastics are defined by their ability to soften and become moldable when heated and to solidify upon cooling.
Option C: This is not a recognized scientific term used in the classification of polymers or plastics.
Option D: This is a fabricated term that sounds plausible but is not a standard scientific classification for plastics.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of plastics based on their reaction to heat as background academic context rather than a clinical decision trigger.
Understanding plastic properties is crucial in healthcare for material selection. Many single-use sterile items like syringes and IV bags are made of thermoplastics (e.g., polypropylene, PVC) because they are easily mass-produced by injection molding.
Thermosetting plastics are used in durable medical equipment and components that require heat resistance and structural integrity, such as housings for electronic medical devices or components that undergo steam sterilization (autoclaving).
In dentistry, thermosetting polymers are used to create durable dental fillings and prosthetics that must withstand the temperatures of hot foods and drinks without deforming.

How to Approach the Question

First, identify the key descriptive phrase in the question: 'do not get easily deformed on heating'.
This phrase points to a material that is heat-resistant and dimensionally stable after its initial formation.
Analyze the options. The prefix 'Thermo-' relates to heat. The suffixes '-plastic' and '-setting' are the differentiators.
Recall the definitions: 'plastic' implies moldability, while 'setting' implies becoming fixed or permanent.
Therefore, 'Thermosetting' logically describes a material that becomes set or fixed by heat.
Evaluate the other options. 'Thermoplastic' describes a material that remains plastic or moldable with heat. 'Thermowasting' and 'Thermosolid' are not standard scientific terms and can be eliminated.

Concept Tested & Keywords

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Attempt every question from this paper in a timed mock, then review the full solution for each one.