Rotterdam basis standard grade II and trioxide grade antimony rose to fresh all-time highs above $15,000 per tonne on Wednesday, amid reports that Chinese sellers will not offer below $15,500. Prices rose to $15,250-15,750 per tonne from $14,500-14,950 per tonne previously. Antimony has risen 135% in the year to March as the Chinese market has become increasingly tight, and last week domestic prices for standard grade II hit a new record high of 99,000-100,000 yuan ($15,084-15,237) per tonne