- Compressive strength (MPa)
- Compressive modulus (GPa)
- Stress–strain curves
- Yield stress and strain values
- Deformation and failure analysis
- Detailed laboratory test report
ISO 604: Plastics Compression Testing Services
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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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
What Is ISO 604 Plastics Compression?
ISO 604 is an international standard used to determine the compressive properties of rigid and semi-rigid plastics under controlled conditions. It evaluates how materials behave under compressive loads, providing key mechanical properties such as compressive strength, modulus, and strain behavior.
The test is widely applied to thermoplastics, thermosets, and reinforced polymers to assess performance under load-bearing conditions. It helps in understanding deformation, yield behavior, and structural stability of materials used in engineering, automotive, and industrial applications.
Applications and Benefits of ISO 604 Plastics Compression Testing
Scope
ISO 604 testing evaluates:
- Compressive strength (MPa)
- Compressive modulus (GPa)
- Compressive yield stress and strain
- Stress–strain behavior under compression
- Deformation and failure characteristics
Applications
- Thermoplastics (PE, PP, ABS, PC, Nylon)
- Thermosetting plastics and composites
- Reinforced plastics (short fiber-filled ≤7.5 mm)
- Automotive and structural components
- Electrical and industrial plastic parts
Benefits
- Provides standardized compressive property data
- Supports material selection for load-bearing applications
- Enables comparison across polymer grades
- Helps detect deformation and failure behavior
- Improves design reliability under compression
Our ISO 604 Testing Procedure
Specimen Preparation
Specimens (typically ~50 × 10 × 4 mm for modulus or ~10 × 10 × 4 mm for strength) are prepared and conditioned.
1Specimen Setup
The sample is placed between two parallel compression platens ensuring proper alignment.
2Load Application
A compressive force is applied at a controlled rate until deformation or failure occurs.
3Data Measurement
The compressive strength, stress–strain behavior, and modulus are recorded and analyzed.
4ISO 604 Test Parameters and Requirements
| Parameter | Details |
|---|---|
| Test Type | Compression test |
| Applicable Materials | Thermoplastics, thermosets, reinforced plastics |
| Specimen Shape | Rectangular or cylindrical |
| Specimen Dimensions | ~50 × 10 × 4 mm (modulus), ~10 × 10 × 4 mm (strength) |
| Measured Parameters | Compressive strength, stress, and modulus |
| Test Environment | Controlled laboratory conditions |
| Output Data | Stress–strain curve and compressive properties |
- Universal Testing Machine (UTM)
- Compression platens with an alignment system
- Load cell (high accuracy)
- Extensometer or displacement sensor
- Specimen preparation tools
- Data acquisition software
Equipment and Instrumentation Used for ISO 604 Testing
What You Receive: Test Report, Data, and Certification
ISO 604 Plastics Compression FAQs
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.
Why Choose Infinita Lab for Plastics Compression Testing?
At the core of this breadth is our network of 2,000+ accredited laboratories across the USA, offering access to over 10,000 testing methods and analytical services. From advanced materials characterization (SEM, TEM, RBS, XPS) to mechanical, chemical, environmental, biological, and standardized ASTM/ISO-compliant testing, we deliver unmatched flexibility, specialization, and scale. You are never limited by geography, facility, or methodology — Infinita Lab connects you to the right expertise and testing solution, every time.
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