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SAFETY DATA SHEET ( SDS ) for PYRO - GUARD ° TREATED WOOD Chlorothalonil (Acute Toxicity) - Ingestion : Low acute oral toxicity ; LD50 in rats is 4 ,200 mg/kg of body weight . Can cause gastrointestinal irritation, nausea , vomiting, and diarrhea . Can result in some corrosive action to the mouth , throat, esophagus , and stomach tissue . Studies on rats and mice have suggested that technical chlorothalonil (97 %) , when fed at high levels in diet, may have oncogenic potential to these laboratory animals . However, neither chlorothalonil nor its metabolites interact with DNA and thus are not mutagenic . Metabolism studies have demonstrated that the rat metabolizes chlorothalonil to form metabolites that are toxic to kidney mitochondria . Much lower levels ( 150 to >2000 fold) of these metabolites are formed in dogs and monkeys , thus , effects seen in rats may not translate to man . Tumor formation has been related to a non- genotoxic mechanism of action for which threshold levels have been established on rats and mice . Comprehensive dietary and worker exposure studies have shown exposure levels for humans to be well below these threshold levels . In addition, surveillance of chlorothalonil plant workers for over twenty years has not demonstrated any increase in oncogenic potential to humans . Skin/dermal : Low acute dermal toxicity ; LD50 in rabbits is greater than 2 , 000 mg/kg and less than 20 , 000 mg/kg of body weight . Repeated or excessive dermal exposure may cause marked skin irritation . On overexposed skin, may cause moderate irritation, redness , and a flaky rash may result. Skin rash is seldom observed if the following recommended safeguards are followed : Wear rubber gloves when handling, using, or applying this product. Special precautions should be taken to ensure that material cannot get inside gloves . Wear long-sleeved shirts , long pants , and rubber boots or disposable coveralls when handling this product. Inhalation : LC5o in rats is greater than 0 . 20 mg/L and less than 2 . 1 mg/L (or g/m3 ) . Eye irritation (Rabbit/Monkey) : Reversible corneal , iridal and conjunctival effects . Maximum mean score (noted at 24 hours ) : Rabbit = 23 . 3 / 110 Monkey = 25 . 3 / 110 . Human experience indicates that this product may cause mild to severe irritation, depending on the degree of exposure . The Following Are Taken As A Group : 5 -Chloro -2 -methly-4-Isothiazolin-3 -one 2 -Methyl-44sothiazolin- 3 -one Magnesium Nitrate (Acute Toxicity) - The below statements are with the above components at 10 . 6 % , 3 . 5 % and 15 . 0% respectively ; numerous times the actual present in the product . ROUTES OF ENTRY : Inhalation , dermal absorption , skin contact and eye contact . SIGNS AND SYMPTOMS OF ACUTE OVEREXPOSURE . Eyes - Corrosive to eyes . Severely irritating to the eyes and may cause eye burns . May cause permanent eye injury . Skin - Corrosive to the skin . Severely irritating to the skin and may cause chemical burns to the skin . May cause allergic skin sensitization of susceptible persons . May be fatal if absorbed through the skin . Ingestion - May be harmful or fatal if swallowed . Ingesting may produce chemical burns to the lips , oral cavity , upper airway, esophagus and possibly the digestive tract . SDS #HTWP2 Hoover Treated Wood Products, Inc . (800) 832-9663 i PAGE 13 OF 16 www. fitw .com