Practice question · Select all that apply
Which are true of exotherm in resin casting?
Hints
- Three describe the phenomenon and its consequence; one treats a hazard as a convenience.
- A runaway exotherm ruins the cast rather than helping it.
Show the answer
- A. It is a reason resin casts are often made hollow
- B. A thick section can reach a temperature that damages the mould
- C. Curing resin releases heat
Why
The fourth mistakes a hazard for a benefit. A thick section can run away thermally, cracking the cast, damaging the mould and producing fumes, which is exactly why resin positives are usually built up as a hollow shell by rotating or brushing rather than poured solid.
Practise Positives and the Multiple
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More questions on Positives and the Multiple
- In a properly declared edition of ten bronzes, what distinguishes the first cast from the seventh?
- An edition is declared at ten casts. How many of them are equally the work?
- Slip casting controls wall thickness by how long the slip is left standing in the mould.
- Sort each casting material by its principal characteristic.
- Complete the account of positives and editions.
- A cast bronze is classed as allographic rather than autographic. What follows from this distinction when…
- Arrange the stages of producing a cast positive in order.
- A cast bronze from a reusable mould is autographic in the same strict sense as a carved marble.