Nalco 77352 Msds Patched May 2026

NALCO 77352 (also known as NALCO 77352NA) is a broad-spectrum, non-oxidizing liquid biocide primarily used for microbiological control in industrial water systems. It is specifically designed for cooling towers, closed-loop cooling systems, air washers, and process water systems to prevent fouling and corrosion caused by bacteria and algae. Key Hazard Information (MSDS Summary)

According to the Safety Data Sheet (SDS) provided by the Pennsylvania Department of Environmental Protection, the product is classified as hazardous and requires strict handling procedures. Primary Hazards:

Corrosive: Causes irreversible eye damage and severe skin burns.

Sensitizer: May cause an allergic skin reaction in some individuals.

Acute Toxicity: Harmful if inhaled, swallowed, or absorbed through the skin.

Environmental: Very toxic to aquatic life with long-lasting effects.

Active Ingredients: Typically contains a blend of isothiazolinones (specifically CMIT/MIT) and magnesium salts.

Physical Properties: A pungent, yellow-to-colorless liquid with a pH of approximately 3.0 to 5.0. Safe Handling & Personal Protective Equipment (PPE)

Eye Protection: Wear chemical splash goggles and a full face shield.

Skin Protection: Use rubber, nitrile, or butyl gloves and protective clothing impervious to the material.

Respiratory: Use with adequate ventilation; an approved respirator is required if significant mists or vapors are generated.

Storage: Store in a cool, well-ventilated area in tightly closed, labeled containers. Avoid extremes of temperature and protect from freezing. Emergency Measures

Eyes: Immediately flush with water for at least 15–20 minutes and seek medical attention.

Skin: Remove contaminated clothing and rinse skin with plenty of water for 15–20 minutes.

Spills: Do not touch spilled material. Contain with an absorbent material like sand or earth. Dispose of as hazardous waste according to local regulations.

Fire: Not flammable, but may evolve toxic fumes (HCl, NOx, SOx) under fire conditions. Use extinguishing media suitable for the surrounding fire.

For the most current and specific data, always refer to the official Nalco/Ecolab SDS provided with the product shipment or contact their 24-hour emergency line at (800) 424-9300 (CHEMTREC).

Comprehensive Profile of NALCO® 77352 NALCO® 77352 (also referred to as NALCO® 77352NA) is a high-performance, non-oxidizing biocide primarily utilized for the control of microbial growth in industrial water systems. As a proprietary blend manufactured by Ecolab (Nalco Water), it is designed to manage bacteria, algae, and fungi in environments ranging from cooling towers to brewery pasteurizers. nalco 77352 msds

Due to its potent chemical nature, the Safety Data Sheet (SDS) for Nalco 77352 classifies it as a hazardous and corrosive substance that requires strict adherence to safety protocols. Chemical Composition and Properties

The efficacy of Nalco 77352 is derived from its active isothiazolinone components.

Active Ingredients: It contains a mixture of 5-chloro-2-methyl-2H-isothiazol-3-one and 2-methyl-2H-isothiazol-3-one (typically in a 3:1 ratio), along with Magnesium Nitrate and Magnesium Chloride. Physical State: A yellow liquid with a pungent odor.

Solubility and pH: It is completely soluble in water and has an acidic pH typically between 3.0 and 5.0.

Stability: The product is stable under normal conditions but can evolve hazardous gases like hydrogen chloride, nitrogen oxides ( NOxcap N cap O sub x ), and sulfur oxides ( SOxcap S cap O sub x ) if involved in a fire. Industrial Applications

Nalco 77352 is favored in industrial settings for its broad-spectrum control and compatibility with various treatment programs.

Target Systems: It is used in open recirculating cooling systems, closed-loop cooling systems, air washers, and process water systems.

Key Benefit: Because it does not contain copper stabilizers, it is particularly suitable for closed-loop systems where increasing copper content would be a concern.

Efficiency: It remains effective even at higher pH values and in the presence of organic matter. Health and Safety Hazards

The SDS identifies several critical health risks associated with exposure to Nalco 77352:

Corrosivity: It causes irreversible eye damage and severe skin burns upon contact.

Sensitization: It can cause an allergic skin reaction, which may be delayed after exposure.

Toxicity: It is harmful if inhaled, swallowed, or absorbed through the skin. Handling, Storage, and PPE

Strict personal protective equipment (PPE) and handling procedures are mandatory to mitigate risks:

PPE Requirements: Personnel must wear chemical splash goggles, a face shield, and impermeable gloves (such as nitrile or butyl rubber). For high-exposure tasks, chemical-resistant suits and rubber boots are recommended.

Storage: Keep containers tightly closed in a cool, well-ventilated area. It should be protected from freezing and extreme heat.

Material Compatibility: Compatible storage materials include PVC, Polyethylene (PE), Teflon, and 316L Stainless Steel. It is not compatible with aluminum, brass, or carbon steel. Environmental Impact NALCO 77352 (also known as NALCO 77352NA) is

Nalco 77352 is classified as very toxic to aquatic organisms.

Ecological Effects: It can cause long-lasting harmful effects in aquatic environments.

Disposal: The product and its containers must be disposed of at an approved waste disposal plant in accordance with local and national regulations. It should never be allowed to enter drains or surface water. NALCO® 77352NA

This report provides a detailed overview of NALCO 77352 (also referred to as NALCO 77352NA

), a non-oxidizing biocide primarily used for microbiological control in industrial water systems. 1. Product Identification and Application Product Name: NALCO 77352 / NALCO 77352NA. Primary Function:

Broad-spectrum, non-oxidizing biocide and fungicide used to control microorganisms, including fungi and bacteria, in cooling water and related industrial systems. Common Applications: Open and recirculating cooling systems.

Closed-loop cooling systems (safe for use as it does not contain copper stabilizers).

Process water systems, air washers, and brewery pasteurizers. files.dep.state.pa.us 2. Hazardous Composition

The active ingredients are proprietary but typically include: Isothiazolinones: A blend of isothiazolin-3-one biocidal agents. Magnesium Nitrate:

Often included as a hazardous component in these formulations. Lenntech Water treatment 3. Physical and Chemical Properties Value/Description Physical State Colorless to light yellow 3.0 – 5.0 (Acidic) Specific Gravity 1.01 – 1.03 @ 20°C 1.02 g/cm³ (approx. 8.5 lbs/gal) Solubility Completely soluble in water Boiling Point 100°C (212°F) Freezing Point -3°C (26.6°F) Flash Point Does not flash 4. Hazard Identification and Safety NALCO 77352 is classified as a chemical requiring strict safety protocols. NALCO® 77352NA

NALCO 77352 is a broad-spectrum, non-oxidizing biocide designed to control microbiological growth in industrial water systems, including cooling towers, process water, and brewery pasteurizers. It is a liquid blend of isothiazolin-3-one active agents, typically appearing colorless to light yellow with a pungent odor. Hazard Identification

This product is classified as a corrosive chemical and a skin sensitizer.

Physical Hazards: Can cause irreversible eye damage and severe skin burns.

Health Hazards: Harmful if swallowed or inhaled. Prolonged exposure may cause allergic skin reactions.

Environmental Hazards: Highly toxic to aquatic life with long-lasting effects. Composition & Chemical Properties Active Ingredients

5-Chloro-2-methyl-4-isothiazolin-3-one (1–5%), 2-Methyl-4-isothiazolin-3-one (0.1–1%) Hazardous Additives Magnesium Nitrate (1–5%) pH (Neat) 3.0 – 5.0 (Acidic) Density 1.01 – 1.03 kg/L Solubility Complete in water Handling and First Aid

Always refer to the official Ecolab SDS portal for the most current safety documentation. Safety Data Sheets - SDS - MSDS - Ecolab Mandatory PPE: Strict enforcement of glove and goggle

15. Conclusion and Recommendations

Nalco 77352 is an effective industrial water treatment chemical that poses significant health hazards (Corrosive/Irritant). To ensure safety:

  1. Mandatory PPE: Strict enforcement of glove and goggle usage is required.
  2. Secondary Containment: Storage tanks and drums must have secondary containment (spill pallets/bunds) capable of holding 110% of the volume.
  3. Training: All personnel handling the chemical must undergo WHMIS/GHS hazard communication training.

Disclaimer: This report is a draft summary generated for informational purposes. It does not replace the official Safety Data Sheet (SDS) provided by Nalco Water (Ecolab). Always consult the specific SDS provided by the supplier for the most accurate and up-to-date regulatory and safety data.

NALCO 77352 is a broad-spectrum, non-oxidizing biocide primarily used to control microbiological growth in industrial water systems, such as cooling towers and brewery pasteurizers. According to the product's safety data sheet (SDS), it is corrosive liquid that causes irreversible eye damage and skin burns files.dep.state.pa.us Key Safety and Hazard Information

Classified as harmful if swallowed, inhaled, or absorbed through the skin. It is also highly toxic to aquatic organisms and can cause allergic skin reactions. Active Ingredients:

Contains Magnesium Nitrate, Magnesium Chloride, and a mixture of Isothiazolinones (5-chloro-2-methyl-2H-isothiazol-3-one and 2-methyl-2H-isothiazol-3-one). Physical Properties: Appearance: Clear light yellow liquid. 2.0 – 5.0 (neat). Solubility: Completely soluble in water. files.dep.state.pa.us Handling and First Aid Personal Protective Equipment (PPE):

Always wear safety goggles or a face shield, nitrile or butyl rubber gloves, and protective clothing when handling the product. First Aid: Eye Contact:

Rinse immediately with water for at least 15 minutes and seek medical attention. Skin Contact:

Wash immediately with soap and water for 15 minutes; remove contaminated clothing. Ingestion:

induce vomiting; rinse mouth and contact a poison center immediately.

Store in a cool, well-ventilated area in tightly closed, labeled containers. Storage for more than 6 months is not recommended. files.dep.state.pa.us For official or updated documents, you can use the Ecolab SDS Request Form

to obtain the latest version directly from the manufacturer. Further Exploration View the full technical SDS for NALCO 77352

from the Pennsylvania Department of Environmental Protection, which includes detailed acute human health hazards. Review the Product Overview

from Lenntech for specific application benefits and dosage recommendations in cooling water systems. Consult the Scribd SDS document

for comprehensive GHS classifications and ecological toxicity data for various aquatic species. material compatibility of this biocide with specific industrial equipment? NALCO® 77352NA

4. Composition and Ingredients

While specific trade-secret percentages are withheld by the manufacturer, the primary active ingredients generally include:

  1. Phosphoric Acid (CAS 7664-38-2): contributes to the acidic/corrosive nature.
  2. Tolyltriazole (CAS 29385-43-1): The primary corrosion inhibitor for copper and copper alloys.
  3. Sodium Hydroxide (CAS 1310-73-2): Used for pH adjustment (product is formulated to be slightly acidic to neutral depending on specific blend, but raw materials are hazardous).
  4. Water (CAS 7732-18-5).

Note: The specific synergy of these ingredients makes the product an effective filming agent for metallurgy protection.

Section 11: Stability and Reactivity

7.1 Occupational Exposure Limits (OELs)

NALCO 77352 contains no substances with established OSHA PELs or ACGIH TLVs in hazardous concentrations. However, an internal Nalco occupational exposure limit for the polymer component (e.g., 10 mg/m³ as total particulate) may apply.

6.2 Storage Requirements

Pro Tip: The MSDS recommends secondary containment (spill pallets) for all bulk storage to satisfy EPA SPCC (Spill Prevention, Control, and Countermeasure) requirements.

Ingestion

Note to physicians: Product is corrosive. Endoscopic examination may be necessary. Avoid gastric lavage if significant esophageal corrosion is suspected.

Precautionary Statements (P-Codes):