Universities in Greater Manchester have found no evidence that dangerous concrete was used to build their campuses – but some are still investigating.

Bolton and Salford universities have said their records do not suggest that any of their buildings contain reinforced autoclaved aerated concrete (RAAC).

But the two universities are carrying out further tests to check for this type of concrete which could suddenly collapse.

It comes after government guidance issued late last month meant seven Greater Manchester school buildings where RAAC was found could not fully reopen after the summer holidays.

Local authorities are now investigating whether other publicly-owned buildings – such as leisure centres, market halls and libraries – contain the lightweight material which was used between the 1950s and mid-1990s, primarily in buildings that have a large, unsupported roof. Manchester Metropolitan University (MMU) has confirmed there is no RAAC on its campus, saying that the majority of its estate has been built in the last five to 10 years.

The University of Manchester, which has already carried out a survey on its buildings, has also said there is no evidence that its campus contains RAAC. However, the University of Salford has said it is currently undertaking further tests on building constructed within the relevant time frame ‘to be certain’.

A University of Salford spokesperson said: “The University conducts regular audits of all buildings to ensure that they are safe and fit for purpose. In light of the current issues regarding RAAC we have further reviewed our building data and the initial findings suggest that RAAC has not been used in the construction of any of our buildings.

“However, we wish to be certain about this and are undertaking further tests on buildings constructed within the relevant time frame. There is no impact on colleagues and students from this work and all activity continues as normal on our campus.”

A University of Bolton spokesperson said: “Our records and recent checks show no indication of the material on our campus. We have now commissioned survey work to assure ourselves further.”

A University of Manchester spokesperson said: “The University of Manchester estates team has carried out a survey of University buildings, and has found no evidence for the presence of RAAC.”

MMU said there is no RAAC in its buildings.

A number of Bolton schools have been affected by the material and are taking action.