Application Process for Adhesive Composition Analysis Test Report
Date：2025-12-12 09:25:42 Classification
：【question】 Visits：
Adhesive composition analysis is indeed a crucial step in ensuring product safety and performance, especially for products exported or entering specific markets. An authoritative testing report can help mitigate many risks.
Adhesive Composition Analysis Test Report Process
I. Preliminary Preparation Stage
1. Clarify Testing Needs
- Report Purpose: E-commerce entry (e.g., CMA/CNAS certification required for Tmall/JD.com), export to the EU (requires REACH compliance), production quality control, etc.
- Adhesive Type: Solvent-based (e.g., neoprene), water-based (e.g., white glue), hot melt adhesive, etc. Different types require different pretreatment methods.
2. Technical Document Preparation
① Sample Information: 2-3 complete samples (≥50g/sample, sealed packaging)
② Basic Information: Product instructions (including ingredient list), brief description of production process (e.g., whether it contains solvents/curing agents)
③ List of Testing Items:
Mandatory Tests: Qualitative analysis of main components (resin/polymer type), heavy metal migration (EN71-3 standard), VOCs content (GB (33372-2020)
Optional Test Items: Phthalate (DEHP≤0.1%), Polycyclic Aromatic Hydrocarbons (PAHs), Formaldehyde Emission
II. Selection and Cooperation of Testing Institutions
1. Qualification Requirements
- Must possess CMA metrological certification and CNAS laboratory accreditation (reports must bear both seals)
- Recommended Institution: Dezewei Testing CNAS Registration No.: L8083
2. Process Coordination
- Sign a testing contract (clearly define the standard basis, such as GB/T 31818-2015 Starch Adhesive Standard)
- Confirmation cycle and cost: Regular 5-7 working days, expedited 3 days (cost increases by 30%-50%), single sample testing fee approximately 800-2000 RMB (fluctuates depending on the number of items)
III. Core Testing Steps (Laboratory Execution)
1. Sample Pretreatment
- Solvent-based adhesives: Gas chromatography-mass spectrometry (GC-MS) is used, requiring solvent extraction (e.g., n-hexane) and centrifugation.
- Water-based adhesives: High-performance liquid chromatography (HPLC) is used, with ultrasonic-assisted extraction of water-soluble components.
- Special treatment: Adhesives containing fillers require thermogravimetric analysis (TGA) to separate organic/inorganic components.
2. Instrumental Analysis Methods
| Detection Items | Instrument Type | Key Parameter Examples
| Principal Component Qualitative Analysis | Fourier Transform Infrared Spectroscopy (FTIR) | Characteristic Functional Group Absorption Peaks (e.g., hydroxyl -OH)
| Heavy Metal Migration | Inductively Coupled Plasma Mass Spectrometry (ICP-MS) | Lead (Pb) Limit < 100 ppm
| Volatile Organic Compounds | Headspace-Gas Chromatography (HS-GC) | Total Benzene Series < 500 mg/kg
3. Data Validation
- Parallel Experiments (3 replicate tests, error ≤ 5%)
- Spike Recovery Validation (Target Substance Recovery 80%-120%)
IV. Report Acquisition and Application
1. Report Review Points
- Must include: Detection standard number (e.g., GB/T 27576-2011 General Rules for Component Analysis of Adhesives), instrument model, and sample chromatogram.
- Key pages must be stamped with the CMA/CNAS seal and a seal across the binding.
2. Common Problem Handling
- If unknown components are detected: The laboratory can be requested to conduct a NIST spectral library search or additional validation (e.g., nuclear magnetic resonance NMR).
- Rectification of data exceeding limits: Provide the raw material supplier's MSDS and replace with low-toxicity solvents or lead-free pigments.
V. Precautions
- Sample representativeness: For bottled adhesives, samples should be taken from different depths (upper/middle/lower layers mixed) to avoid stratification affecting the results.
- Standard updates: For exports to the EU, attention should be paid to newly added restricted substances in Annex XVII of the REACH Regulation (e.g., PFAS substances added in 2025).
- Report validity period: Usually 1 year. Retesting is required if the formula or production process changes.
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