ASTM C225 Test Methods for Resistance of Glass Containers to Chemical Attack

ASTM C225 uses an autoclave to determine the resistance of glass containers to chemical attacks. An autoclave is a machine used to carry out industrial and scientific processes which require a higher temperature and pressure with respect to the ambient temperature and pressure. Values are expressed in SI units.

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ASTM C225 Test Methods for Resistance of Glass Containers to Chemical Attack

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Overview
Scope, Applications, and Benefits
Test Process
Specifications
Instrumentation
Results and Deliverables

Overview

ASTM C225 covers standard test methods for evaluating the resistance of glass containers to chemical attack by measuring the amount of material leached from the glass surface when exposed to specific aqueous solutions under controlled conditions. It determines how well glass containers withstand degradation from their contents or surrounding environment.

This method is critical for glass containers used in storage of sensitive substances, laboratory glassware, and industrial packaging where chemical durability directly impacts product integrity. Results guide material selection, quality control, and compliance verification for glass manufacturers supplying containers across chemical, laboratory, and industrial packaging sectors.

Scope, Applications, and Benefits

Scope

ASTM C225 covers three distinct test methods for evaluating glass container chemical resistance: the powder method, the glass grain method, and the surface method. Each method targets different aspects of glass durability and attack mechanisms.

The scope includes:

Powder method for measuring leached alkali from ground glass exposed to water
Surface method for evaluating interior surface attack of intact containers
Glass grain method for bulk glass durability characterization
Testing with distilled or deionized water as the attacking medium
Applicable to soda-lime, borosilicate, and other glass compositions
Suitable for new containers and comparative evaluation of glass formulations
Results reported as volume of acid equivalent per unit area or mass

Applications

Chemical durability evaluation of laboratory and industrial glass containers
Quality control of glass packaging for chemical storage
Comparative testing of different glass compositions and formulations
Incoming inspection of glass containers for sensitive material storage
Failure analysis of glass containers showing surface deterioration or product contamination
Research and development of new glass compositions with improved durability
Compliance testing for glass container specifications and procurement standards
Evaluation of glass containers used in high-purity water and reagent storage
Characterization of recycled or reformulated glass materials
Verification of glass durability after surface treatment or coating application

Benefits

Provides quantitative measure of glass chemical resistance
Three test methods allow flexibility based on specimen form and test objective
Applicable to a wide range of glass types and container geometries
Identifies substandard glass batches before deployment in sensitive applications
Supports comparative ranking of glass formulations for material selection
Relatively simple procedure with minimal specialized equipment
Results directly correlate with real-world leaching and container durability
Supports supplier qualification and incoming material inspection programs
Useful for both production quality control and R&D glass development

Test Process

Specimen Preparation

Glass containers or ground glass powder are prepared, cleaned, and conditioned per method-specific requirements.

Chemical Exposure

Specimens are exposed to distilled water under defined temperature and time conditions in sealed vessels.

Leachate Analysis

Extracted leachate is titrated or analyzed to quantify dissolved alkali or elemental content per unit area or mass.

Reporting

Results are expressed as ml of acid equivalent per unit surface area and classified against acceptance criteria.

Technical Specifications

Parameter	Details
Test Methods Covered	Powder method, surface method, glass grain method
Attacking Medium	Distilled or deionized water
Test Temperature	121°C (autoclave) or 98°C depending on method
Exposure Duration	Typically 30 minutes to 1 hour depending on method
Reporting Units	ml of 0.02N H₂SO₄ per container or per 100 cm²
Analysis Method	Acid-base titration or ICP elemental analysis
Specimen Form	Intact containers or ground glass grains/powder

Instrumentation Used for Testing

Autoclave or water bath for controlled temperature exposure
Analytical burette for acid-base titration of leachate
Analytical balance for specimen mass measurement
Distillation or deionization unit for preparation of attacking medium
pH meter for endpoint verification during titration
ICP-OES for elemental leachate analysis where required
Desiccator for specimen conditioning and cooling
Borosilicate glass or PTFE vessels for leaching exposure

Results and Deliverables

Leached alkali volume expressed as ml of 0.02N H₂SO₄ equivalent
Surface attack values per 100 cm² of interior glass surface
Pass/fail classification against specified chemical resistance thresholds
Comparative data across multiple glass types or container lots
Elemental leachate composition where ICP analysis is performed
Full test report with method used, specimen details, and exposure conditions
Titration records and calibration data for QA/QC traceability
Recommendations for glass type suitability based on results

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At the core of this breadth is our network of 2,000+ accredited labs in the USA, offering access to over 10,000 test types. From advanced metrology (SEM, TEM, RBS, XPS) to mechanical, dielectric, environmental, and standardized ASTM/ISO testing, we give clients unmatched flexibility, specialization, and scale. You’re not limited by geography, facility, or methodology—Infinita connects you to the right testing, every time.

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Frequently Asked Questions

ASTM C225 evaluates the chemical durability of glass containers by measuring the amount of material leached when exposed to distilled water under controlled temperature and time, indicating resistance to surface degradation and chemical attack.

Poor chemical resistance allows glass components to leach into stored contents, potentially contaminating sensitive materials, altering pH, or introducing metallic ions that compromise product purity, safety, and shelf life.

Borosilicate glass typically shows significantly lower leaching values than soda-lime glass due to its network-stabilizing boron content, making it more chemically durable and preferred for laboratory and high-purity storage applications.

Yes. ASTM C225 is well suited for incoming inspection and batch-level quality control. Regular testing of production lots helps identify batch-to-batch variability in glass composition or surface quality before containers reach end users.

Glass composition, melting temperature, annealing quality, surface treatments, and storage conditions all influence chemical resistance. Higher silica and boron content generally improve durability while high alkali content reduces it.