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potential consequences of their use in highly engineered systems is to ensure that they and their supply chains buy only from DuPont and their authorized distributors," it said in a statement.
A Precision Varionic official, Ursula Aldridge, said PVI had no comment. Quality management chief John Penman and manufacturing and purchasing director Roger Osborn did not respond to requests for comment.
Calls to the listed number for Kexiang's small factory in Shenzhen went unanswered. People seen inside the factory during a recent visit by Reuters declined to answer questions.
Zhang Ronghui, a Kexiang factory manager absent from the site but contacted by Reuters on his mobile phone, said he was aware of the recall of Aston Martin parts, but denied any direct involvement with the British carmaker. "We're fine. We don't make things (for Aston Martin). Another company does it," said Zhang, who declined a request for a meeting.
Attempts to contact Fast Forward Tooling and Synthetic Plastic Raw Material weren't successful. A visit to the Hong Kong address for Fast Forward cited in Aston Martin's document found it to be that of a small legal and secretarial firm where the company had registered its business but had no actual presence.
Aston Martin spokeswoman Sarah Calam said the Chinese sub-suppliers Fast Forward and Kexiang are being replaced, with production shifting to the U.K. The automaker will continue working with Precision Varionic.
In the meantime, she said, both Aston Martin and DuPont have sent people to China to directly supervise the production of all pedal arms, including verifying that each bag of DuPont-branded plastic material is genuine.
As a widely practiced protocol, upper-tier suppliers such as Precision Varionic have responsibility to verify the quality of so-called sub-assemblies provided by lower-tier subcontractors, according to Matteo Fini, senior supply chain consultant with IHS Automotive in London.
"The more one goes down the chain, the less transparent and visible the chain becomes," Fini said.
Aston Martin purchasing director Gary Archer told Reuters on Feb. 7 that "supply chain management is a big challenge for all car makers", but said the company has a robust quality-control system to monitor its suppliers.
The carmaker's spokeswoman Calam