Glycol antifreeze - corrosion & scale inhibitors
Accepta 8701 , AF 112 ( NORCHEM )
Solution Strength :
25 Ltrs RXSOL-16-4020-025 : 75 Ltrs Water gives freezing protection up to -140C "or" 25% solution (1 part anti-freeze to 3 parts water)
For extra cold / winter climate , increase to a 33% solution (1 part anti-freeze to 2 parts water) to give freezing protection down to -170C.
EYES : Irrigate copiously with clean, fresh water for at least 15 minutes. Seek medical advice.
SKIN : Wash immediately with plenty of water. Remove contaminated clothing. If irritation persists seek medical attention. Wash contaminated clothing before using them.
INHALATION : Remove to fresh air. If breathing is irregular seek medical advice.
INGESTION : Obtain immediate medical attention. Induce vomiting only if indicated by the doctor. Never give anything by mouth to an unconscious person.
Antifreezes have been proposed with consist of water-soluble alcohols as the chief nonaqueous ingredients plus anticorrosion agents containing 0.4 to 80% benzotriazole, its ammonium salt, or tetrabortate, or their mixtures. The amount of the agent in the antifreeze is sufficient to produce a concentration of about 0.01 to 2.0% benzotriazole or its salt and 0.5 to 3.0% of the weight of the water soluble alcohols.
Another antifreeze consists of a water-soluble alcohol, particularly ethylene glycol, and an agent containing 0.2 to 77% benzotriazole, its alkali metal or ammonium salt or their mixtures, or N-alkylbenzotriazole; 2.2 to 80% of an alkali metal arsenite, arsenate or molybdate or their mixtures; and 11 to 96% of a material which maintains the pH of the aqueous solution of the anticorrosion agent at about 7.5 to 10.5. The anticorrosion agent is present in an amount sufficient to produce concentrations of 0.01 to 2.0% benzotriazole; 0.1 to 2.0% arsenite, arsenate, or molybdate; and 0.5 to 2.5% of the buffer.
Other corrosion inhibitors for ethylene glycol solutions have been proposed. For example, one contains 1 part phosphoric acid (density 1.75) and sufficient technical triethanolamine (usually about 3 parts by wt) added to 100 parts ethylene glycol to bring the pH of a 50% aqueous solution of the mixture to 7.2. The resulting composition shows less tendency to corrode metals than a corresponding composition in which the benzotriazole is replaced by 0.2 to 0.3 parts sodium mercaptobenzotriazole.
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