ASTM D5227 Measurement of Hexane Extractable Content of Polyolefins

The ASTM D5227 test method specifies an extraction/gravimetric procedure for determining the amount of hexane soluble low molecular weight material present in polyethylene, polypropylene, ethylene-propylene copolymers, and ethylene-vinyl acetate copolymers.

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ASTM D5227 Measurement of Hexane Extractable Content of Polyolefins

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

Overview

ASTM D5227 determines the hexane extractable content of polyolefins, which represents the fraction of low molecular weight or non-polymeric components soluble in hexane. This measurement is important for evaluating material purity and composition in polymer products.

The method is widely used to assess residual oligomers, additives, and unreacted species that may affect performance, safety, and regulatory compliance. Accurate determination of extractables helps ensure consistent product quality and suitability for critical applications such as packaging and molded products.

Scope, Applications, and Benefits

Scope

ASTM D5227 covers the determination of hexane-soluble extractable content in polyolefin materials using solvent extraction techniques under controlled conditions. It focuses on quantifying the soluble fraction that may influence material properties.

Applicable to polyethylene and polypropylene materials
Measures hexane-soluble low molecular weight components
Uses solvent extraction and gravimetric analysis
Supports quality control and compliance testing
Suitable for pellets, films, and molded products

Applications

Food-contact material evaluation
Polymer purity and quality assessment
Packaging material testing
Regulatory compliance verification
Additive and residue analysis
Research and development of polyolefins
Production quality monitoring

Benefits

Ensures material purity and consistency
Detects residual monomers and additives
Supports regulatory compliance requirements
Improves product safety and performance
Enables comparison of polymer grades
Enhances quality assurance processes

Test Process

Sample Preparation

Polyolefin sample is weighed and prepared in suitable form such as pellets or film pieces.

Solvent Extraction

Sample is exposed to hexane under controlled conditions to dissolve extractable components.

Separation and Drying

Extracted solution is separated and solvent is evaporated to recover residue.

Gravimetric Analysis

Residue is weighed to calculate the percentage of hexane extractables.

Technical Specifications

Parameter	Details
Material Type	Polyolefins (PE, PP)
Solvent Used	Hexane
Measurement Method	Gravimetric analysis
Output	Percentage of extractable content
Extraction Conditions	Controlled temperature and time
Sample Form	Pellets, films, or molded parts
Residue Type	Low molecular weight components

Instrumentation Used for Testing

Soxhlet extractor or extraction apparatus
Analytical balance
Heating system or water/oil bath
Evaporation setup
Glassware for solvent handling
Drying oven
Fume hood

Results and Deliverables

Percentage of hexane extractables
Residue mass measurement
Material purity assessment
Compliance evaluation data
Detailed analytical report
Observations and test conditions

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Frequently Asked Questions

ASTM D5227 is used to measure the hexane extractable content in polyolefins. It helps determine the amount of low molecular weight substances and residues that may affect product safety, quality, and performance.

ASTM D5227 helps identify soluble impurities such as oligomers and additives. High extractable content can impact mechanical properties, safety, and regulatory compliance, especially in sensitive applications like food packaging.

Factors such as extraction time, temperature, solvent purity, and sample preparation influence results. ASTM D5227 requires controlled conditions to ensure accurate and reproducible measurements.

ASTM D5227 indicates that low extractable content reflects higher material purity and better performance, especially in applications requiring strict safety and quality standards.

ASTM D5227 helps identify and reduce unwanted extractables, enabling development of safer and higher-quality polymer products with improved performance.