Assertion: acetylene | /r/HasProperty | purified
Facets:
value: by passing it
type: MANNER
Source sentences:
text: According to this, all materials, especially those used for sealings, should be able to withstand exposure to acetone, and the acetylene needs to be purified by passing it over an adsorbent of suitable size or polarity (e.g., zeolite A and alumina (55) or zeolite 13X (56) ).