Conformity of SDC Polyester Ballast over time, between and within batches, is vital to give consistent test results and enable accurate comparison of test specimens to performance requirements. SDC Polyester Ballast is compared during every test with a Master Standard, this guarantees no drift in performance over time. Packaging Please ensure that the product is retained in its original SDCE packaging, which contains the correct batch details. All product packaging is tested to ensure there are no contaminants or BHT content that could cause fabric yellowing. Pack sizes are measured and approved using UK weights and measures act.