The phrase "irrelevant material" is correct and commonly used in written English.
It refers to information or details that are not relevant or related to the topic or subject being discussed. Example: "The speaker kept going off on tangents and including irrelevant material, making it difficult for the audience to follow the main point of the presentation."
In turn, retailers drown you in superfluous, mainly irrelevant material.
No longer can a dissident senator prevent members from inserting irrelevant material in conference.
They argue for studying science and math rather than "irrelevant material".
That irrelevant material improves the ability of engineers and chemists to think, to discern and to explain their findings.
Finding and decoding the message to authenticate the product would require knowing the sequence of the relevant portion of DNA amid the welter of irrelevant material.
This approach reduces the burden on analysts required to review extremely large quantities of irrelevant material with consequent improvement to operational effectiveness.
The study found that EIA reports are often prepared by incompetent contractors that are not accredited and the reports are poor in quality, too technical, mostly published in the English language, cluttered with irrelevant materials, too long, and frequently contain information copied from other documents.
177 items remained after the elimination of 625 irrelevant materials.
We retrieved and screened over 5,000 documents; after eliminating duplicates and irrelevant materials, we examined in more detail 45 TTIDs.
Therefore longstanding concerns that donor programmes intended to improve access to resources in low-income countries may actually supply irrelevant materials do not seem to be resolved (18, 21, 26, 27).
The prosecution, meanwhile, introduced a variety of apparently irrelevant video material as evidence, including reports produced by Greste in Kenya, where he was based before his arrest.
