Acumer™ 4161

Acumer™ 4161 is manufactured by DOW Chemical (Mid South Chemical is a “certified” repackager of Acumer™ products)


Phosphinopolycarboxylic Acid scale inhibitor and dispersant for water treatment


ACUMER™ 4161 is a phosphinopolycarboxylic acid scale inhibitor and dispersant that has a unique balance of threshold inhibition and dispersancy, and is resistant to chlorine and compatible with most microbiological control agents.

Used in Water Treatment

  • Cooling Water
  • Boiling Water
  • Pulp and paper


  • Effectively disperses boiler sludge components
  • Excellent hydrothermal stability
  • Compatible with commonly used boiler additives
  • Good scale control agent for calcium carbonate and calcium sulfate
  • Effectively disperses particulate matter such as silt and clay
  • Eliminates the need for phosphonates and acrylates in many formulations
  • Effective in both acid and alkaline papermaking systems


Typical Properties

These properties are typical but do not constitute specifications.

Appearance Clear solution to slightly hazy
Total Solids (%) 50-52
Active Solids (%) 46-48
pH 3.0-3.5
Molecular Weight1 3300-3900
Specific Gravity1 1.20-1.25
Density, lb/gal @ 25°C 10.0-10.4
Brookfield Viscosity (mPa.s/cps @ 25°C) 500-2000

1Measured by aqueous GPC and reported as acid form.

Application Benefits
Boiling Water -Effectively disperses boiler sludge components.-Excellent hydrothermal stability.

-Compatible with commonly used boiler additives.

Cooling Water -Good scale control agent for calcium carbonate and calcium sulfate.-Effectively disperses particulate matter such as silt and clay.

-Eliminates the need for phosphonates and acrylates in many formulations.

-Effective in alkaline systems and under severe service conditions

Pulp and paper -Good scale control agent for calcium carbonate and calcium sulfate.-Performance equal to or better than many phosphonates and acrylates.

-Effective in both acid and alkaline papermaking systems.


Mechanism of Action

ACUMER 4161 (PCA) polymer inhibits scale build up on surfaces through at least three mechanisms:

  • Solubility enhancement or threshold effect, which reduces precipitation of low solubility inorganic salts.
    Crystal modification, which deforms the growing organic salt crystals to give small, irregular, readily fractured crystals that do not adhere well to surfaces.
  • Dispersing activity, which prevents precipitated crystals or other inorganic particles from agglomerating and depositing on surfaces.
  • Low molecular weight polymers are widely used to inhibit scaling in industrial water treatment.


Boiling Water

Sludge Dispersancy

Laboratory testing of ACUMER 4161 (PCA) polymer has demonstrated excellent control of boiler sludge, equal or superior to traditional chemistries using polyacrylates, phosphonates and competitive products utilizing phosphinopolycarboxylic acids.

High Temperature Stability

ACUMER 4161 (PCA) polymer is stable at high pressures and temperatures typical of those found in industrial boilers, up to at least 900 psig.

Cooling Water

Calcium Carbonate Inhibition

Under high pH and alkalinity conditions, calcium carbonate scale formation is a potential problem that can be prevented by threshold inhibition.

Dispersing Activity

Industrial cooling water contains particulate matter such as silt, clays and calcium-based precipitates. The particles can deposit on heat transfer surfaces and produce excessive sediment in regions of low water velocity.

Kaolin clay was used to represent particles commonly found in many waters. At low polymer levels (6 ppm) ACUMER 4161 (PCA) polymer has kaolin clay dispersancy equivalent to a competitive PCA and polyacrylic acid polymers.

Pulp and paper

Calcium Sulfate Inhibition

ACUMER 4161 (PCA) polymer effectively inhibits calcium sulfate precipitation.


Please contact a Mid South Representative for additional product information and pricing.