Pirelli has confirmed that the tyre on which Nico Rosberg suffered a 320km/h spin during this week's Bahrain test will not be put forward for use in the future.

The German was conducting the last day of the specially-convened session when he suffered a high-speed blow-out on the main straight at Bahrain International Circuit, prompting a memorable - and swiftly deleted - Twitter post about needing an urgent supply of toilet paper.

Mercedes was one of four teams present at the track to conduct a three-day test of tyre compounds being put forward for possible use in 2014, but was forced to pack up early as a result of damage caused in the spin.

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In a secondary statement issued in the wake of the incident, Pirelli confirmed that the tyre which Rosberg had been using was experimental and would not be seen in action again.

"The tyre tests in Bahrain regarded a number of prototypes, which were completely innovative in terms of structure and compounds, with the aim of developing the most suitable solutions for the next season," the official communiqu? revealed.

"This morning, Nico Rosberg's Mercedes was fitted with one of these prototypes, a tyre which had only been tested in the laboratory and which will not be proposed again.

"Thus, the safety of the tyres which will be supplied for the next championship is not in question.

"The accident which happened to Rosberg's car is being investigated and the findings will be communicated to the FIA and the teams."

Rosberg was unhurt in the incident, although his tweet suggested he was more than a little shaken by the severity of the blow-out.