Are Vazo® free radical sources toxic?
They exhibit low to moderate toxicity. However, tetramethylsuccinonitrile (TMSN), a by-product of Vazo® 64, is highly toxic. The properties of TMSN should be discussed with a DuPont Technical Service Representative before attempting to use Vazo® 64. Vazo® 67 is a safer alternative. For comparison, the oral toxicity data of Vazo® products and their decomposition products are shown in the table below. For all grades except Vazo® 67, the quantities represent approximate lethal dose (ALD); for Vazo® 67, the quantities are the lethal dose for 50% of test animals.
