Aqueous Medium: pH 6.0-8.0, Conductivity <10 µS/cm

Q: What is the role of aqueous medium in elastomer emulsion?

It serves as the continuous phase for emulsion polymerization, dispersing monomers, stabilizing particles, and facilitating heat and mass transfer.

Q: What are the key quality parameters for aqueous medium?

Key parameters include pH (6-8), low conductivity (<10 µS/cm), low dissolved oxygen, and minimal total dissolved solids.

Component Specifications

Definition

An aqueous medium is a water-based continuous phase that contains dissolved surfactants, initiators, and other additives, serving as the reaction environment for emulsion polymerization to produce elastomer latex. It facilitates heat transfer, particle stabilization, and uniform monomer dispersion.

Working Principle

The aqueous medium provides a stable liquid environment where monomers are emulsified into droplets by surfactants. Polymerization occurs within these droplets or at the particle-water interface, with the medium controlling pH, ionic strength, and temperature to ensure consistent particle size and latex stability.

Materials

Deionized water with controlled conductivity (<10 µS/cm), pH adjusted (typically 6-8), and dissolved oxygen removed. May contain buffer salts (e.g., sodium bicarbonate) and chelating agents (e.g., EDTA).

Technical Parameters

Parameter	Typical range	Notes & selection driver
PH	6.0-8.0
Conductivity	<10 µS/cm
Dissolved Oxygen	<1 ppm
Total Dissolved Solids	<50 ppm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 3696, ASTM D1193

Parent Products

This component is used in the following industrial products

Elastomer Emulsion

A stable colloidal dispersion of elastomeric polymer particles in an aqueous medium.

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Engineering Analysis

Risks & Mitigation

Contamination leading to off-spec latex
pH instability causing coagulation
High conductivity affecting particle stability

FMEA Triads

Trigger: High conductivity from dissolved ions
Failure: Reduced latex stability and increased coagulum
Mitigation: Use deionized water and monitor conductivity inline

Trigger: pH drift during storage
Failure: Inconsistent polymerization kinetics
Mitigation: Buffer with sodium bicarbonate and control CO2 ingress

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

pH ±0.2, Conductivity ±2 µS/cm

Test Method

ISO 10523 for pH, ISO 7888 for conductivity

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Aqueous Medium

Manufacturer profiles associated with Aqueous Medium.

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Frequently Asked Questions

What is the role of aqueous medium in elastomer emulsion?