Name the Plastic Material That Dates Back to the Late

question 129

Essay

Name the plastic material that dates back to the late 1800s. This plastic is hard and rigid, has good compression strength, is tough, and does not absorb moisture, but it is brittle. These plastics are commonly used for the manufac- ture of electrical switches and insulators, electronics circuit boards, distributor caps, and binding material and adhesive.

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Definitions:

Glenoid Cavity

A shallow, articular depression on the lateral angle of the scapula that articulates with the head of the humerus to form the shoulder joint.

Infraspinous Fossa

A depression located below the spine of the scapula, serving as a site for muscle attachment.

Supraspinous Fossa

A depression located above the spine of the scapula on the posterior side, which accommodates the supraspinatus muscle.

Glenoid Cavity

A shallow depression in the scapula that articulates with the head of the humerus to form the shoulder joint.