How to perform compositional analysis on non-metallic materials?
Date：2026-01-28 09:50:08 Classification
：【question】 Visits：
Compositional analysis is a technique that analyzes the composition of a product or sample using microscopic spectra and femtosecond laser detection of molecular structure, performing qualitative and quantitative analysis of each component. The compositional analysis of non-metallic materials can be carried out according to the following steps:
I. Clarify Requirements and Determine the Testing Plan
1. Identify Material Type and Test Items: Based on the non-metallic material category (plastics, rubber, ceramics, glass, etc.), and in conjunction with product characteristics and specific needs, select test items, such as qualitative and quantitative compositional analysis, molecular weight detection, thermal stability analysis, analysis of components related to electrical conductivity, and investigation of components related to hardness/wear resistance.
2. Match Implementation Standards: Prioritize the use of authoritative international or domestic standards, such as corresponding standards under ISO, GB, ASTM, etc. For example, for plastic compositional analysis, refer to ISO 11469:2016; for cement-based materials, follow GB/T10294-2018. Simultaneously, it must comply with the regulatory requirements of the product's place of use.
II. Selecting a Compliant Third-Party Testing Organization
1. Verify Core Qualifications: Ensure the organization possesses laboratory accreditations such as CMA, CNAS, or ISO/IEC 17025 (DEZEW Testing CNAS Registration No.: L8083), guaranteeing the credibility and authority of the test results.
2. Assess Hardware and Technical Capabilities: Pay attention to whether the organization is equipped with professional analytical instruments, such as atomic absorption spectrometers, gas chromatography-mass spectrometry, FTIR infrared spectrometers, SEM-EDS scanning electron microscopy with energy dispersive spectroscopy, and ICP inductively coupled plasma atomic emission spectrometry; also confirm that the organization has technical experience and case studies in the analysis of corresponding non-metallic materials.
III. Preparing Qualified Samples
1. Sample Requirements: Samples must be representative, reflect the homogeneity of the entire batch of materials, maintain their original state, avoid contamination and physical damage, and be packaged in sealed containers.
2. Sample Quantity and Additional Information: The standard sample quantity should be no less than 10 grams. For special tests such as trace element analysis and microstructure observation, the sample quantity can be adjusted appropriately. Simultaneously, clearly state the testing objective and key component indicators to the testing institution to facilitate customized analysis protocols.
IV. Execution of Professional Testing Procedures
1. Sample Receiving and Registration: The testing institution verifies the sample information and registers the sample after confirming its integrity and undamagedness.
2. Pretreatment and Sample Preparation: Samples undergo targeted treatment according to different testing methods, such as pulverizing the sample into powder, preparing a thin film, or polishing or metallizing the sample surface to meet the environmental and sample morphology requirements for infrared spectroscopy, SEM-EDS, and other tests.
3. Multi-method Joint Testing: Combining multiple analytical methods for complementary detection improves result accuracy:
FTIR infrared spectroscopy identifies organic and some inorganic components;
SEM-EDS observes material surface morphology and performs elemental distribution microscopic analysis;
TGA thermogravimetric analysis indirectly reflects component and additive characteristics;
ICP or XRF performs qualitative and quantitative elemental analysis;
XRD phase analysis determines the crystal structure and phase composition of the material.
4. Data Analysis and Report Issuance: The testing organization analyzes and evaluates the data according to standards, issuing a complete test report including test items, applicable standards, test results, and evaluation recommendations.
V. Report Application and Subsequent Optimization
1. Quality Control: Based on the report results, determine whether the material meets standards and requirements, and conduct product quality control.
2. Formulation and Process Improvement: Manufacturers can use component analysis data to optimize product formulations, adjust production processes, and improve material performance and product quality.
Shen Gongwang Security: 44030602006947