ISO 604: Compressive Properties of Plastics Testing

ISO 604 is an international standard that provides a method for determining the compressive properties of plastic materials. Compressive properties are important in predicting the performance of plastics under compression or crushing loads. The standard provides a reliable and consistent method for measuring the compressive strength, modulus, and strain of plastic materials under specific loading conditions.

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ISO 604: Compressive Properties of Plastics Testing

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

Overview

The methods for determining the moisture content in plastic materials are established in the ISO 15512 standard. The procedure is usually carried out by methods such as Karl Fischer titration or gravimetric methods to evaluate the moisture content in the plastic materials.

The procedure is useful in the evaluation of the materials since the moisture content in the materials may influence the processing, mechanical, and performance properties of the materials.

Scope, Applications, and Benefits

Scope

ISO 604 defines procedures for measuring the compressive properties of plastic materials under controlled loading conditions. The test helps evaluate how plastics deform or fail when subjected to compressive stress, supporting material selection and product design.

The scope includes:

Determination of compressive strength of plastics
Measurement of compressive stress–strain behavior
Evaluation of compressive modulus of materials
Testing of thermoplastics and thermoset plastics
Support for material comparison and quality control

Applications

Structural plastic components
Engineering plastic parts
Reinforced plastic materials
Construction and industrial plastics
Polymer product development

Benefits

Evaluates load-bearing capability of plastics
Helps select materials for structural applications
Supports design and engineering analysis
Enables material comparison and quality control
Improves product durability and performance

Test Process

Specimen Preparation

Plastic specimens are prepared to standard dimensions and conditioned before testing.

Sample Placement

The specimen is placed between compression platens in the testing machine.

Load Application

A compressive force is applied at a controlled rate until deformation or failure occurs.

Data Measurement

The compressive strength, stress–strain behavior, and modulus are recorded and analyzed.

Technical Specifications

Parameter	Details
Test Type	Compression test
Applicable Materials	Thermoplastics, thermosets, reinforced plastics
Specimen Shape	Rectangular or cylindrical
Test Equipment	Universal Testing Machine (UTM)
Loading Mode	Compression
Measured Parameters	Compressive strength, stress, and modulus
Test Environment	Controlled laboratory conditions
Output Data	Stress–strain curve and compressive properties

Instrumentation Used for Testing

Universal Testing Machine (UTM)
Compression Platens
Extensometer / Displacement Sensor
Vernier Caliper / Micrometer
Data Acquisition System

Results and Deliverables

Compressive strength values
Compressive modulus and stress data
Stress–strain curve
Test conditions and parameters
Detailed laboratory test report

Why Choose Infinita Lab for ISO 604: Compressive Properties of Plastics Testing?

Infinita Lab is a trusted USA-based testing laboratory offering ISO 604: Compressive Properties of Plastics Testing services across an extensive network of accredited facilities across the USA.

Infinita Lab is built to serve the full spectrum of modern testing needs—across industries, materials, and methodologies. Our advanced equipment and expert professionals deliver highly accurate and prompt test results, helping businesses achieve quality compliance and product reliability.

Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090 to learn more about our services and how we can support you. Request a Quote

Frequently Asked Questions

ISO 604 determines the compressive strength, compressive modulus, and deformation behavior of plastic materials when subjected to compressive loads. The test helps evaluate how plastics perform under crushing or compressive stress in structural applications.

ISO 604 applies to rigid and semi-rigid plastics such as thermoplastics, thermosets, and reinforced plastics. The test is commonly used for materials utilized in construction, automotive, electrical components, and industrial structural applications.

The standard typically uses rectangular or cylindrical specimens with defined dimensions. Proper specimen preparation and uniform surfaces are important to ensure accurate compressive load distribution and reliable measurement of compressive properties.

Compressive testing helps manufacturers ensure materials can withstand loads without failure. It supports product design, quality control, and material selection for components exposed to compressive forces in engineering and structural applications.

Factors such as specimen dimensions, testing speed, temperature conditions, alignment of the specimen, and equipment calibration can influence results. Proper preparation and controlled test conditions are essential for obtaining accurate and repeatable measurements.