Synthomer ( LSE:SYNT ) shareholders, like myself, have had a bit of a shock today. The Synthomer share price is down 13.56%, which takes it down about 8.5% over a year. The company has reported no news today. The FTSE 100 and FTSE 250 are in the green, so the Synthomer share price crash cannot be blamed on market weakness. Perhaps it's the entire basic materials sector, of which Synthomer is a part, that is having a bad day? No, some basic materials stocks are up, some are down, it all looks pretty normal there.