OIT 98 (2 N octyl 4 isothiazolin 3 one)

Chemical Name: 2-n-octyl-4-isothiazolin-3-one (OIT)

Synonym: OCTYLISOTHIAZOLINONE

CAS No: 26530-20-1

Soluble, synthetic, and semi-synthetic metalworking fluids or coolants provide an excellent environment for the growth of various microorganisms, including bacteria, mold, and yeast. If allowed to grow, these organisms can have detrimental effects on the fluids. For example, bacteria, which can grow very quickly, can destroy the integrity of the fluid by discoloration, destroying lubricity characteristics, and causing emulsions to split. Bacteria can also reduce the pH of the fluid, which can promote corrosion. Some forms of bacteria have objectionable odors. Fungi typically grow more slowly than bacteria, but can form large masses which clog filters and lines and in some cases lead to system shutdown; fungi also generate foul odors and can cause corrosion. The increased use of synthetic fluids over the past few years has led to an even greater need for the enhanced fungal control that OIT-98 Biocide can provide.

For Tankside and Concentrate

Octylisothiazolinone Biocide is a broad-spectrum fungicide that has been recommended and widely used for tankside control of fungi in metalworking central systems. It is also an effective fungicide for use in many metalworking fluid concentrates with the appropriate stabilizer package. Due to the wide variations in metalworking fluid formulations, laboratory or small-scale tests are recommended to evaluate OIT 98 in use- dilution and concentrate metalworking fluids before they are commercialized. It is a highly effective, industrial fungicide that exhibits excellent fungistatic and fungicidal activity against fungi, including yeasts and mold, and Gram-Positive bacteria, and limited activity against Gram-Negative bacteria. Commonly known as octhilinone, 2-n-octyl-4-isothiazolin-3-one is the active ingredient. It is supplied as a 98 percent active liquid in propylene glycol.

Typical Properties

These properties are typical but do not constitute specifications

Solubility

Octylisothiazolinone Biocide is soluble in methanol, ethanol, propylene glycol, acetone, ethyl ether, et-hyl acetate, chloroform, butyl Cellosolve, corn oil, and mineral oil. The solubility in toluene is 25% w/v. The solubility in water at 25°C is 480 ppm (active ingredient), although this may be increased by using suitable surfactants and emulsifiers. It is insoluble in heptane.

Compatibility

In concentrate and use-dilution metalworking fluids, the compatibility is concentration-dependent and varies from formulation to formulation. It is compatible with most metalworking fluid additives, including surfactants and amines. Compatibility with amines may vary by the type, concentration and pH. Strong reducing agents, such as sulfides, mercaptans, bisulfites and metabisulfites, or strong oxidizing agents, such as hypochlorites, may affect the efficacy of OIT-98 Laboratory or small-scale tests are recommended in order to evaluate compatibility in use-dilution or concentrate metalworking fluids prior to commercialization.

Stability

In-Use Stability: It has excellent stability in end use dilutions of metalworking fluids. It is stable over a wide pH range (4-10) in water and in metalworking fluid systems. Concentrate Stability OIT-98  Biocide stability, in metalworking fluid concentrates, is variable. We recommend checking stability and performance before commercialization of products.

Storage Stability:

In general, the storage stability of OIT-98 Biocide product is excellent. The shelf life of the product is nominally twelve years at 25°C. It is strongly recommended, however, that both the stability and compatibility in metalworking fluid formulations or systems be thoroughly examined before commercialization.

Applications/ Directions for Use

Method of Addition

It should be directly dispensed into metalworking fluid concentrates or use-dilution metalworking fluids using a metering pump or other point-of-use device where possible and uniformLy dispersed throughout the fluid.

Fluid Concentrate

It should be added to metalworking fluid concentrates at a level that ensures the final use-dilution fluid will contain 55 to 167 ppm of product (25 to 75 ppm active ingredient). OIT-98 stability in a given concentrate should be determined prior to commercialization.

Use-Dilution Fluid

We highly recommend grossly contaminated systems be cleaned before treatment is begun.

Initial Dose: For a noticeably fouled system, add 0.24 to 0.72 lbs (7 to 21 fl oz) of Sinotrust OIT98 Biocide per 1,000 gallons of fluid. This will provide 10 to 35 ppm active ingredient. Repeat until control is achieved.

Subsequent Dose: For maintenance of a non-fouled system, add 0.045 to 0.29 lbs (1.3 to 8.6 fl oz) of OIT-98 Biocide per 1,000 gallons of fluid every four weeks. This will provide 2 to 15ppm active ingredient. A higher dose range and/or increased frequency of treatment may be required, depending upon the rate of dilution of the preservative with the makeup fluid, the nature and severity of contamination, level of control required, filtration.