BARQUAT PQ

Barquat PQ controls algae growth and maintains water clarity.
Barquat PQ prevents microbial fouling and biofilm formation.
Barquat PQ inhibits microbial growth in water systems.

CAS Number: 25988-97-0
EC Number: Not applicable
Active Ingredient: N,N-Dimethyl-2-hydroxypropylammonium chloride polymer
Molecular Formula: (C₅H₁₂NO)nClₙ
Molecular weight: Variable depending on chain length, but the average molecular weight is around 20,000 g/mol.

SYNONYMS:
N,N-Dimethyl-2-hydroxypropylammonium chloride polymer, Poly(2-hydroxypropyl dimethyl ammonium chloride), Poly(dimethylamine-co-epichlorohydrin), Dimethylamine-epichlorohydrin copolymer,

Barquat PQ is a cationic polymer biocide that effectively inhibits the growth of algae and slime-forming bacteria in industrial circulating cooling water.

Barquat PQ also effectively inhibits the growth of various algae in swimming pools, ponds, and reservoirs, and can be used in acidic, alkaline, and highly hard water environments.
At any concentration, Barquat PQ is non-foaming, non-toxic, and non-irritating, making it safer to use.

Barquat PQ is a non foaming biocide.
Barquat PQ is a non-foaming cationic polymeric quaternary ammonium algaecide / biocide, containing the polymer N,N-Dimethyl-2-hydroxypropylammonium chloride polymer.

USES and APPLICATIONS of BARQUAT PQ:
Barquat PQ is used in many settings where algae, bacteria or biofilm control is required + water clarity, odor control, etc.
Industrial Cooling Systems / Cooling Towers uses of Barquat PQ: Preventing algae and microbial buildup, controlling biofilm, reducing fouling of heat exchange surfaces.

Swimming Pools / Commercial Pools / Spas: Barquat PQ is used as an algaecide to maintain clarity, reduce halogen (chlorine/bromine) demand, reduce filter clogging.
Water Circuits / Air Washers: In systems where water is recirculated and exposed to ambient contamination, Barquat PQ helps in maintaining water clarity and reducing microbial load.

Metalworking Fluids & Synthetic Fluid Preservation: Some sources list uses for Barquat PQ in preserving water-based synthetic metalworking fluids—for preventing microbial spoilage in such fluids.
Hygiene & Other Industrial Applications: Though the main use is water treatment, Barquat PQ's also mentioned for hygiene, wood protection, oil & gas in some of the supplier spec sheets.

Barquat PQ is formulated for water treatment, particularly for systems like cooling towers, air washers, swimming pools, and water circuits.
Concentration in commercial Barquat PQ is about 60% (in “Polyquat” form) for Barquat PQ; another variant, PQ-2, has about 50%.
Barquat PQ is used algae control for swimming pools/holding ponds/reservoirs/tanks of industrial fresh water systems.

Barquat PQ is used for use in water circuits and swimming pools.
Bactericidal property: Barquat PQ can be used as a bactericide in swimming pools, landscape water, industrial circulating water and other water bodies.

Applicable environment: Barquat PQ can be used in acidic, alkaline and high hard water environments.
Usage characteristics of Barquat PQ: No foam, no irritating odor, non-toxic, no harm to the human body during use.
Principle: The cations electrostatically bond with the negative charges on the algae cell walls, destroying and killing the algae cells.

Barquat PQ is primarily used as a non-foaming algaecide and biocide in various water treatment applications.
Swimming Pools and Whirlpools: Barquat PQ controls algae growth and maintains water clarity.
Industrial Recirculating Cooling Waters: Barquat PQ prevents microbial fouling and biofilm formation.

Pulp and Paper Mill Waters: Barquat PQ inhibits microbial growth in water systems.
Application of Barquat PQ: Cationic polymeric non foaming biocide for use: water treatment in industrial cooling water systems, Algae control for swimming pools/holding ponds/reservoirs/tanks of industrial fresh water systems.

Barquat PQ is used cationic polymeric non foaming biocide for use:
Barquat PQ is used water treatment in industrial cooling water systems.
Barquat PQ is used algae control for swimming pools/holding ponds/reservoirs/tanks of industrial fresh water systems.

Barquat PQ is used preservation of water-based synthetic metalworking fluids based on amines, borates, phosphates, nitrates, etc, and also for the protection of those fluids based on soluble or emulsifying oils modified with nonionic surfactants.
Barquat PQ is used especially in swimming Pools, SPA, Whirlpools, Hot tubs and metal processing.

The initial treatment of Barquat PQ should be repeated whenever the water does not appear transparent.
This dose of Barquat PQ is merely meant as guideline and may be modified according to different characteristics of the pool or climate.

Pour the necessary dose of Barquat PQ in a container with water and evenly distribute over the pool water surface.
Barquat PQ should be added when there is no swimmer in the pool and preferably during the evening.

FEATURE DETAILS of BARQUAT PQ:
Non-Foaming Because of its polymeric nature, Barquat PQ does not produce foam in water treatment circuits, which simplifies treatment and does not require anti-foam agents.
Compatibility Compatible with materials used in cooling towers, swimming pools, etc.; compatible with non-ionic and inorganic builder surfactants; incompatible with strong anionic surfactants (they form high molecular weight insoluble complexes).

Multiple Functions Barquat PQ acts not only as an algaecide / biocide but also helps in coagulation / clarification (improving water clarity), biodispersion (dispersing biofilm / deposits), reducing unpleasant odours and helping reduce halogen demand and filter clogging.
Barquat PQ is effective over a fairly broad pH and temperature range; stable in hard water conditions.

Barquat PQ is useful because many water systems vary in these parameters.
Slow-Acting / Lasting Residual While not always “fast kill” like oxidizers, Barquat PQ provides lasting effect / residual control of algae / biofilm over time.
Water Clarity Improvement: Barquat PQ helps reduce turbidity by aiding clarification/coagulation, reducing filter clogging.

DIRECTION FOR USE of BARQUAT PQ:
SWIMMING POOLS:
Initial shock treatment: 20-30 ppm.
Weekly dosage for maintenance: 5-10 ppm.

COOLING WATER SYSTEMS:
Initial shock treatment: 20-30 ppm.
Twice weekly dosage: 5-10 ppm.

PHYSICAL and CHEMICAL PROPERTIES of BARQUAT PQ:
Active Ingredient: N,N-Dimethyl-2-hydroxypropylammonium chloride polymer
CAS Number: 25988-97-0
EINECS Number: Not applicable
UN Number: 3082
Molecular Formula: (C₅H₁₂NO)nClₙ
Appearance: Colorless to slightly yellow liquid
Odor: Odorless to slight ammonia smell
pH: Approximately 7.7–8.7
Density: Approximately 1.17–1.19 g/cm³
Viscosity: Approximately 2500 mPa·s
Surface Tension: Approximately 56 mN/m

Solubility: Good solubility in water
Foaming: Non-foaming
Flash Point: >100°C
Appearance: Colourless to slightly yellow liquid
Odor: Odorless or slight ammonia-like smell
Active Content: 59.0 – 61.0 %
pH (10 % aqueous solution): 5.5 – 8.0
Viscosity (Brookfield, spindle 2, 10 rpm):
At 5 °C: 1,000 – 4,000 mPa·s
At 23 °C: 500 – 2,000 mPa·s

Average Molecular Weight: ~ 20,000 g/mol
Flash Point (Abel-Pensky closed cup): > 100 °C
Surface Tension (1 % aqueous solution): ~ 56 mN/m
Freezing / Setting Point: < 5 °C
Solubility: Completely soluble in water
Foaming Behavior: Non-foaming
Shelf Life / Stability: 2 years (when stored in sealed original packaging)
Compatibility: Compatible with inorganic builders and nonionic surfactants; 
incompatible with anionic surfactants (forms insoluble complexes)
Ionic Character: Strongly cationic (polyquaternary ammonium compound)

Active Substance: Polymeric quaternary ammonium chloride (N,N-Dimethyl-2-hydroxypropylammonium chloride polymer)
Stability: Stable over a broad pH and temperature range; stable in hard water
Chemical Compatibility: Works well with nonionic surfactants; not compatible with anionic surfactants
Hydrolysis: Resistant under normal conditions; may degrade under strongly alkaline or extreme conditions
Redox Behavior: Not classified as an oxidizing or reducing agent
Corrosivity: Non-corrosive at recommended concentrations toward cooling system and pool materials
Environmental / Biocidal Action: Broad-spectrum antimicrobial and algaecidal activity at low ppm concentrations
Regulatory Identifiers:
CAS No.: 25988-97-0 (polymeric active species)
UN No.: 3082 (environmentally hazardous substance for transport classification)

FIRST AID MEASURES of BARQUAT PQ:
-Description of first-aid measures
*General advice:
Show this material safety data sheet to the doctor in attendance.
*If inhaled:
After inhalation: 
Fresh air.
*In case of skin contact: 
Take off immediately all contaminated clothing. 
Rinse skin with
water/ shower.
*In case of eye contact:
After eye contact: 
Rinse out with plenty of water. 
Call in ophthalmologist. 
Remove contact lenses.
*If swallowed:
After swallowing: 
Immediately make victim drink water (two glasses at most). 
Consult a physician.
-Indication of any immediate medical attention and special treatment needed.
No data available

ACCIDENTAL RELEASE MEASURES of BARQUAT PQ:
-Environmental precautions:
Do not let product enter drains.
-Methods and materials for containment and cleaning up:
Cover drains. 
Collect, bind, and pump off spills. 
Observe possible material restrictions. 
Take up dry. 
Dispose of properly. 
Clean up affected area.

FIRE FIGHTING MEASURES of BARQUAT PQ:
-Extinguishing media:
*Suitable extinguishing media:
Carbon dioxide (CO2) 
Foam 
Dry powder
*Unsuitable extinguishing media:
For this substance/mixture no limitations of extinguishing agents are given.
-Further information:
Prevent fire extinguishing water from contaminating surface water or the ground water system.

EXPOSURE CONTROLS/PERSONAL PROTECTION of BARQUAT PQ:
-Control parameters:
--Ingredients with workplace control parameters:
-Exposure controls:
--Personal protective equipment:
*Eye/face protection:
Use equipment for eye protection. 
Safety glasses
*Body Protection:
protective clothing
*Respiratory protection:
Recommended Filter type: Filter A 
-Control of environmental exposure:
Do not let product enter drains.

HANDLING and STORAGE of BARQUAT PQ:
-Conditions for safe storage, including any incompatibilities:
*Storage conditions:
Tightly closed. 
Dry.

STABILITY and REACTIVITY of BARQUAT PQ:
-Chemical stability:
The product is chemically stable under standard ambient conditions (room temperature).
-Possibility of hazardous reactions:
No data available