SPEC HIB QC-4 is an environmentally safe, non-toxic oxygen scavenger based on neutralized organic acids and a blend of volatile/neutralizing amines. SPEC HIB QC-4 controls corrosion throughout the condensate system normally used only in conjunction with SPEC HIB QC-3 as part of the SPEC HIB Program. SPEC HIB QC-4 protects copper-based metals and is highly effective under all operating conditions and protects boiler surfaces by forming an iron tannate film.

SPEC HIB QC-4 removes oxygen efficiently in open feed systems giving effective corrosion inhibition of boiler/exhaust gas economizer system surfaces by converting Fe2O3 (rust) to an organic iron compound. SPEC HIB QC-4's filming properties also reduce corrosion on shut down lines when moisture and oxygen are present. Available in UN approved 5 gallon pails and 55 gallon drums.