ASTM E997 Test to Evaluate Glass Breakage Probability Under Uniform Static Loads by Proof Load Testing

ASTM E997 employs proof load testing to determine the likelihood of glass breakage under static loads. This involves applying controlled force to glass specimens for a specified time interval. It is important to note that the standard values are presented in Imperial units.

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ASTM E997 Test to Evaluate Glass Breakage Probability Under Uniform Static Loads by Proof Load Testing

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

Overview

ASTM E 997 glass breakage probability testing is the standardized test method for evaluating the probability of glass breakage under uniform static loads by proof load testing — determining the statistical breakage probability of glass lites by applying defined proof load levels and assessing survival rate across defined glass specimen populations. ASTM E 997 defines the specimen preparation, proof-load application procedures, and breakage probability calculation methods required to characterize glass static load resistance, providing glazing engineers, building designers, and glass manufacturers with reliable breakage probability data for glass selection, structural glazing design validation, and supplier assessment programs.

Scope, Applications, and Benefits

Scope

ASTM E 997 evaluates glass breakage probability under uniform static loads by applying defined proof load levels to glass lite specimens and recording survival and breakage outcomes — using statistical analysis of specimen population results to determine breakage probability as a function of applied static load for defined glass type, thickness, and lite size combinations.

ASTM E 997 glass breakage probability testing evaluates:

Breakage probability of annealed, heat-strengthened, and tempered glass under static loads
Proof load survival rate of glass lite populations under defined uniform pressure conditions
Statistical breakage probability distribution of glass specimens across defined load levels
Effect of glass type, thickness, lite size, and edge condition on static load breakage probability
Compliance with glass breakage probability requirements for structural glazing specifications

Applications

Architectural glazing systems requiring static load breakage probability characterization
Structural glass facades, curtain walls, and building envelope glazing load resistance assessment
Skylight, overhead glazing, and horizontal glass applications requiring breakage probability data
Windshield, automotive, and transportation glazing static load resistance verification programs
Glass manufacturers and glazing suppliers requiring ASTM E 997 breakage probability test data

Benefits

Provides reliable glass breakage probability data for structural glazing selection and design
Supports building code compliance and glazing structural specification assessment programs
Identifies glass breakage probability deficiencies before building installation
Delivers traceable breakage probability test records for engineering and regulatory submissions
Reduces structural glazing risk by verifying glass static load performance early in design approval

Test Process

Sample Preparation

Glass lite specimens prepared to defined dimensions and edge condition per ASTM E 997 requirements.

Proof Load Application

Uniform static pressure applied to glass specimen surface at defined load rate per ASTM E 997.

Breakage Observation

Specimen survival or breakage outcome recorded at each proof load level across specimen population.

Data Analysis & Reporting

Breakage probability calculated from population survival data and assessed for test compliance result.

Technical Specifications

Parameter	Details
Applicable Materials	Annealed, heat-strengthened, tempered, and laminated glass lites for architectural applications
Proof Load Range	Uniform static pressure from 0.24 kPa to 7.18 kPa per ASTM E 997 load level requirements
Specimen Population	Minimum 30 glass lite specimens per load level for statistically valid breakage probability assessment
Load Application Rate	Uniform pressure applied at defined rate per ASTM E 997 static loading requirements
Measured Outputs	Survival rate, breakage probability values, statistical distribution data, and test compliance result

Instrumentation Used for Testing

Uniform static load application apparatus with a defined pressure distribution system
Calibrated pressure measurement and control system for proof load application
Glass specimen support frame with defined edge support conditions per ASTM E 997
Deflection measurement instrumentation for glass lite deformation monitoring
Specimen breakage observation and recording system
Data acquisition and statistical breakage probability analysis software

Results and Deliverables

Proof load survival and breakage outcome records for all tested glass lite specimens
Statistical breakage probability values as a function of applied static load per ASTM E 997
Survival rate and breakage probability distribution data across tested load levels
Test compliance result assessed against structural glazing breakage probability requirements
ASTM E 997 glass breakage probability test report

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Frequently Asked Questions

ASTM E997 includes applied uniform load levels, specimen dimensions, load duration, support conditions, and failure criteria, evaluating probability of glass breakage under static loading conditions using proof load testing procedures.

ASTM E997 applies uniform static pressure to glass specimens for specified durations, simulating wind or structural loads, and evaluates whether breakage occurs under defined proof load conditions.

ASTM E997 is commonly applied to architectural glass, laminated glass, tempered glass, and glazing systems used in buildings where structural performance and breakage resistance under loads must be evaluated.

ASTM E997 evaluates pass or failure under specified loads and estimates breakage probability based on statistical analysis of test results for glass specimens subjected to uniform static loading.

ASTM E997 evaluates glass performance under controlled laboratory conditions and may not fully represent real-world factors such as impact loads, edge defects, installation variations, or environmental influences affecting breakage behavior.