Natural rubber quoted RMB 18,905/t (+0.51%) and butadiene rubber RMB 14,435/t (+0.31%), holding the natural-to-synthetic spread at RMB 4,470/t. Peak Southeast Asian tapping season is disrupted by rainfall while tyre OEM and replacement restocking lifts spot levels. With the spread in the upper-middle of its historical range, synthetic substitution carries real economics in compounding.