The CFMEU says dangerous goods including asbestos products and cheap, exploding glass are entering Australia and border protection authorities lack the resources to stop it.
Speaking ahead of a Senate inquiry in Brisbane on Monday, the CFMEU's Brad Parker says Border Protection Minister Peter Dutton has failed to properly resource Australia's customs officers.
"Minister Dutton is putting the health and safety of the Australian people at risk by turning a blind eye to cheap imported building materials that do not comply with Australian law," Mr Parker says.
Asbestos was found during the installation of roof panels at the Perth Children's Hospital last year, causing major construction delays.
Also last year, a report commissioned by the Department of Immigration and Border Protection found asbestos had been detected in building materials, children's crayons, motor vehicle gaskets and spare parts.
The CFMEU wants companies to face harsher penalties if they're found to have broken the law by importing unsafe products.