Benchmark Tokyo rubber futures ended down 4.3 percent on Friday, coming under pressure from a plunge in Shanghai futures, following the news of a Thai government plan to sell the commodity from stockpiles to ease supply shortages.
The Tokyo Commodity Exchange rubber contract for June delivery finished 13.2 yen lower at 288.3 yen ($2.51) per kg after hitting a near-two week low earlier. For the week, the contract fell 5.6 percent.
The most-active rubber contract on the Shanghai Futures Exchange for May delivery fell 1,490 yuan to finish at 19,735 yuan ($2,873) per tonne.
The front-month rubber contract on Singapore's SICOM exchange for February delivery last traded at 205.10 US cents per kg, down 11.7 cents.