Formula 1 team Mercedes has been criticised by survivors of the Grenfell Tower fire and government minister Michael Gove for signing an agreement with Kingspan Group PLC (LSE:KGP), which made some of the insulation used in the cladding of the building.
Grenfell survivors described the deal as "truly shocking", while Gove said he was "deeply disappointed".
But Kingspan said its K15 product made up only 5% of the insulation in the block and that it was used without the company's knowledge.
The Mercedes-AMG Petronas F1 team, which Britain's Lewis Hamilton drives for, announced on Wednesday that it had signed a partnership deal with Kingspan.
The public inquiry into the Grenfell Tower fire is currently examining how the building was covered in flammable materials, which contributed to the spread of the fire in June 2017 which killed 72 people.
In an open letter, Grenfell United - a group of survivors and bereaved families from the fire – urged Mercedes to "immediately sever your relationship" with Kingspan.
Levelling Up, Housing and Communities Secretary Michael Gove said on Twitter: "I will be writing to Mercedes to ask them to reconsider. The Grenfell community deserves better."
Kingspan said it played no role in the design of the cladding system on Grenfell Tower.
"The new partnership with the Mercedes-AMG Petronas Formula 1 team reflects the ambitious sustainability targets of both organisations," the company said.
A spokesman for the Mercedes team said: "Our partner Kingspan has supported, and continues to support, the vitally important work of the inquiry to determine what went wrong and why in the Grenfell Tower tragedy.
"Our new partnership announced this week is centred on sustainability and will support us in achieving our targets in this area."