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SPT (Sodium Pyrithione) Fungicide for Metal working fluid
  • SPT (Sodium Pyrithione) Fungicide for Metal working fluid

SPT (Sodium Pyrithione) Fungicide for Metal working fluid

CAS No.: 3811-73-2
Model: Tiansland BT101
Appearance: Amber
pH: 11.0-12.0
Density: 1.06
Taboos: Strong oxidizer and reductant

All types of aqueous based coolants are susceptible to contamination from bacteria, yeast, and mold. Regardless of the type of coolant, bacteria are the most frequently detected microbes in used coolant. Fungi (yeast and mold), while usually present, are not as easily detected by conventional methods, because the filamentous mycelial forms of mold tend to accumulate in machine crevices,in piping, on sump walls, gear boxes and other solid surfaces.

Routine attempts to completely eliminate bacteria through continual use (and sometimes overuse) of bactericides alone usuallyresult in conditions that encourage the growth of yeast and mold.Heavy fungal contamination can often require both mechanical and chemical treatment. Dumping, cleaning and recharging fluids are costly procedures. Moreover, in today's regulatory climate, disposal of used fluid can be expensive. Therefore, it is important that the routine treatment of a system includes a fungicide, as well as a bactericide, to ensure longer system life and savings on replacement, cleaning, and disposal costs.

BT101 Fungicide is based on the chemical active sodium pyrithione, which has a long history of use as a highly active, broad-spectrum antimicrobial agent in metalworking fluids. BT101Fungicide was developed especially for tankside addition, its lower concentration makes it easier to measure correct doses for smaller sumps.

Different use and contamination conditions may require different levels of BT101 fungicides, and physical and chemical compatibility tests with most metal working fluids are recommended. Pool side addition, usually used concentration is: 0.1-0.3%, generally not more than 0.5%.

Frequent checks (at least once per week) of the bacterial and fungal population in the system. When fungi is detected (102 organisms per milliliter or greater) make an addition of BT101 Fungicide.

Spent fluid systems should be cleaned prior to the addition of fresh coolant or BT101Fungicide. Drain the system, clean with a cleaner designed for this purpose, rinse with water, and refill with fresh fluid. BT101Fungicide may be added to the fluid at the time it is prepared (diluted) or to the reservoir (sump) containing the fluid after it  is put into use. If it is added to the reservoir, the fluid should be circulated after addition to ensure mixing.

Chemical reavtive
Oxidizing agents such as peroxides and hypohalites will convert pyrithione first to dipyrithione, and finally to pyrithione sulfinic or sulfonic acid, the latter two being microbiologically inactive.

Strong reducing agents will react with the N-oxide group of pyrithione to give 2-mercaptopyridine or its derivatives. These, too, are less active microbiologically than the parent compounds. At times the addition of BT101Fungicide to aqueous systems may result in a blue color. This is caused by the reaction of ferric ions with sodium 2-pyridinethiol-1-oxide to form iron tris (2-pyridinethiol-1-oxide), a highly colored water insoluble compound. If iron tris (2-pyridinethiol-1-oxide) is  a problem, Arch Chemicals can offer formulation assistance in preventing its formation.

pH Stability
BT101Fungicide can be used over the pH range from 4.5 to 9.5. Below pH 4.5, the sodium salt is in equilibrium with free pyrithione. Pyrithione is active microbiologically, but is very unstable in the presence of light or oxygen. Above pH 9.5, the sodium salt slowly converts to the sodium salt of pyrithione sulfinic acid.

Light Stability
BT101 Fungicide will gradually degrade when exposed to light, depending on the nature of the formulation. Formulations containing BT101Fungicide should be packaged in brown or opaque containers unless tests have shown that photodegradation is not a problem.

The product is effective for a range of microorganisms, some of which are listed in Table 1. Please note that Mini*mum Inhibitory Concentration (MIC) does not represent an effective concentration for use. This should be discussed with your local Sky Shield professional.

Table 1. Typical Physical Characteristics
Appearance Amber
pH,10% in neutral distilled water 11.0-12.0
Density 1.06
Taboos Strong oxidizer and reductant

Technical Service

The microbiology and technology laboratories of Tiansland have the capability of the above experimental projects. Microbiology and technology lab provide technical support and technical severs to customers. If you need these customized technical services, please contact Tiansland sales center.

Health and Safety

The Tiansland BT101 Preservative Safety Data Sheet may be supplied upon request. It should be read and understood by all supervisory personnel and employees before using than is product. If there is any doubt please contact your local Tiansland sales center.


This product is generally packaged in 25kg / 200kg/1000kg barrels.

Welcome to Tiansland biotechnology Co.,Ltd.
We are  the leading supplier of biocides in Aisa. We mainly produce isothiazolinone series biocides:CMIT/MIT,MIT, OIT, DCOIT,BIT,ZPT,SPT,DBNPA,HCHO,Imidazole Derivative.  We create added value by appreciating the needs of our customers – with competitive and innovative solutions.

We provide best-in-class products, service and knowledge to our customers, including: Formulation Expertise, Preservation and Dry Film Fungicides,Water Treatment Chemistries, Sanitizing and Disinfection Chemistries, Regulatory and Toxicology Research Expertise. We create added value by appreciating the needs of our customers - with competitive and innovative solutions.


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