INDUSTRY COMPONENT

Glass membrane

Specialized glass membrane for pH electrodes that enables precise hydrogen ion concentration measurement through ion exchange.

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Component Specifications

Definition
A glass membrane is the critical sensing element in a pH electrode, consisting of a thin, ion-sensitive glass bulb that develops a potential difference when exposed to aqueous solutions. This potential correlates directly to hydrogen ion activity, following the Nernst equation, allowing accurate pH measurement across various industrial applications.
Working Principle
Operates on the ion-exchange principle where hydrogen ions from the solution interact with hydrated gel layers on the glass surface, creating a membrane potential proportional to pH. This potential is measured against a stable reference electrode to determine pH value.
Materials
Lithium silicate-based glass with specific metal oxide additives (typically Li₂O, CaO, BaO) to optimize ion selectivity, electrical conductivity, and chemical durability. Composition varies for different pH ranges and temperature stability.
Technical Parameters
  • Slope 59.16 mV/pH at 25°C
  • pH Range 0-14
  • Zero Point pH 7.0 ± 0.2
  • Response Time <30 seconds to 95%
  • Temperature Range -5°C to 100°C
  • Membrane Thickness 0.1-0.5 mm
  • Internal Resistance 50-1000 MΩ
Standards
ISO 10523, DIN 19266

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Glass membrane.

pH electrode glass membrane ion-sensitive glass pH sensor component hydrogen ion measurement glass membrane specifications industrial pH probes Glass membrane Glass membrane in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

pH Electrode

Electrochemical sensor component that measures hydrogen ion concentration in aqueous solutions by generating a voltage proportional to pH.

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Glass Electrode

A specialized sensor component within a pH monitoring probe that generates an electrical potential proportional to hydrogen ion concentration.

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Engineering Analysis

Risks & Mitigation
  • Chemical degradation in extreme pH solutions
  • Mechanical fracture from impact
  • Reference electrode contamination
  • Temperature coefficient errors
  • Fouling from process media
FMEA Triads
Trigger: Exposure to hydrofluoric acid or strong alkaline solutions
Failure: Complete dissolution or etching of glass surface
Mitigation: Use specialty glass formulations for harsh chemicals; implement pre-treatment systems
Trigger: Thermal shock from rapid temperature changes
Failure: Cracking or micro-fractures in glass bulb
Mitigation: Implement gradual temperature transitions; use temperature-compensated electrodes
Trigger: Protein or oil coating on membrane surface
Failure: Reduced response time and measurement drift
Mitigation: Regular cleaning with enzymatic or detergent solutions; use protective sleeves

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.01 pH for laboratory grade, ±0.1 pH for industrial grade
Test Method
Two-point calibration against NIST-traceable pH buffers at 25°C; slope and offset verification per manufacturer specifications

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

Why does the glass membrane need regular calibration?

Glass membranes experience gradual aging and contamination that affect their electrochemical response. Regular calibration against standard buffer solutions compensates for drift and maintains measurement accuracy.

What causes glass membrane failure?

Common failure causes include mechanical damage (cracks), chemical attack from HF or strong alkalis, dehydration from dry storage, and coating by proteins or oils that block ion exchange.

How should glass membranes be stored?

Store in pH 4 or 7 buffer solution or specialized storage solution to maintain hydration. Never store in distilled water or allow to dry out, as this damages the hydrated gel layer.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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