Reasons for choosing our testing services
ZHONGXI Testing has obtained inspection qualification certifications from multiple countries and regions worldwide. We possess a senior testing team and advanced testing methods, providing independent, impartial, and professional third-party verification services for global carbon projects.
Internationally recognized authority
Certified by multiple international standards such as CNAS, VCS, and GS, with reports universally applicable worldwide.
Global service capability
Covering 140+ countries and regions, it supports on-site detection and remote verification in multiple languages.
Professional experimental methods
Adopt standard experimental methods to ensure accurate and reliable data.
For procurement and quality teams, defining a clear scope for testing saves significant time and ensures alignment with project requirements. Our antioxidant and in vitro efficacy testing services are designed to demonstrate the performance and reliability of materials under standardized conditions. This page outlines the testing scope, parameters, and data analysis methodologies to help clients understand our capabilities and select the appropriate services for their needs.
Testing Scope
Our antioxidant and in vitro efficacy testing covers a wide range of products, including polymers, coatings, lubricants, and specialty chemicals. The testing is applicable to various materials, such as polyethylene, polypropylene, epoxy resins, and synthetic rubbers. Different grades and formulations can be assessed based on client specifications, with common applications including automotive components, industrial parts, and medical devices. The testing aligns with internationally recognized standards such as ASTM, ISO, EN, and GB, ensuring global compliance and interoperability.
Application scenarios include assessing the resistance of materials to oxidative degradation, evaluating the effectiveness of antioxidants in preserving material integrity, and verifying in vitro performance under simulated environmental conditions. The testing is particularly relevant for industries where material longevity and performance under stress are critical, such as aerospace, electronics, and healthcare.
Testing Items and Parameters
The testing items and parameters are designed to measure the antioxidant properties and in vitro efficacy of materials. Key test methods include oxidative induction temperature (OIT), Thermogravimetric Analysis (TGA), and differential scanning calorimetry (DSC). In vitro efficacy is evaluated through methods like cell viability assays, Cytotoxicity tests, and degradation rate measurements. Typical parameters and graded limit requirements are detailed below:
| Test Item | Typical Parameters | Graded Limit Requirements |
|---|---|---|
| Oxidative Induction Temperature (OIT) | Temperature range: 150°C - 300°C | Minimum OIT: 200°C for general applications; higher for critical uses |
| Thermogravimetric Analysis (TGA) | Weight loss percentage at 500°C | Maximum weight loss: 5% for high-performance materials |
| Differential Scanning Calorimetry (DSC) | Heat flow rate and transition temperatures | Consistent transition points within ±2°C of initial values |
| Cell Viability Assays | MTT assay, LDH release assay | Viability > 90% for non-cytotoxic materials |
| Cytotoxicity Tests | ALDH activity, ROS production | No significant toxicity at concentrations up to 100 μg/mL |
Additional parameters can be included based on specific client requirements, such as moisture resistance, UV stability, or chemical compatibility tests. The graded limits are set to ensure materials meet industry benchmarks and regulatory requirements.
Data and Variation Analysis
Parallel-sample and batch-to-batch variation are rigorously assessed to ensure reproducibility and consistency. For parallel-sample analysis, relative deviation between replicates is calculated using standard statistical methods. Typically, test results show a relative deviation of ≤5% for most parameters, with critical tests requiring tighter tolerances of ≤2%. Batch-to-batch variation is evaluated by comparing results from consecutive production runs, with acceptance windows defined based on historical data and material specifications.
The variation analysis includes mean, standard deviation, and confidence intervals to quantify performance consistency. Deviations outside the acceptance window are investigated to identify root causes, such as raw material fluctuations or process variations. The final report provides a comprehensive analysis of variation, including graphical representations of data trends and statistical summaries to support decision-making.
For clients seeking detailed testing services, we invite you to share drawings, material grades, or purchase specifications. This information allows us to match the testing plan precisely to your requirements, ensuring accurate and relevant results. Contact our technical team to discuss your specific needs and receive a customized testing proposal.