"preparing material" is a correct and usable phrase in written English.
You can use it whenever you are referring to the action of getting something ready, such as materials for a school project or work-related materials. For example, "I have been busy preparing material for my upcoming presentation."
Public hearings will not begin until next spring, and administrative and legal staff will spend the coming months preparing material.
When preparing material for broadcast in election periods you should make sure you are fully versed in the relevant rules.
Around the time his son, Jake, was born, five years ago, he was preparing material for a new album.
Fellow girl group 2NE1 and boy band Super Junior are rumoured to be preparing material for release in the UK, while Psy has promised to record an English-language follow-up to Gangnam Style.
Cameron and his team spent Wednesday morning preparing material like this for PMQs and the trick – which Cameron is rather good at – is to deploy these lines in a way that makes them as natural as possible.
Unofficially, the Israelis said there was considerable alarm that the backgrounds of Ms. Ogata and Mr. Sommaruga in humanitarian work would make them receptive to the charges of international aid workers, who were already preparing material for the team.
Variation of activation conditions allowed preparing materials with different textural characteristics.
The technique has found tremendous utility in preparing materials with interesting biological, electronic, and mechanical properties.
The logistic department is responsible for preparing materials needed during surgery.
UNICEF is also preparing materials and staff so that children, tremendously vulnerable during natural catastrophes, are protected.
Integrating photochromic molecules into a polymer matrix is one method of preparing materials with controllable photochemical properties.
