Process materials (gases and chemicals)
What is the appropriate general way to store photoresist?
- AKeep it in a bright, sunny place
- BKeep it in a light-tight container at the specified temperature (such as refrigerated) and use it before its expiration date
- CStore it open at room temperature
Show answer and explanation
Answer: B. Keep it in a light-tight container at the specified temperature (such as refrigerated) and use it before its expiration date
Photoresist is a photosensitive material whose properties change with light and heat, so it is kept in light-tight containers at the specified temperature, such as refrigerated. Its sensitivity and other properties drift over time, so using it within its shelf life is also important.
- A. Light reacts with the resist and degrades it.
- B. Correct. It is kept dark at the specified temperature.
- C. Leaving it open lets solvent evaporate and contaminants enter.