To meet national product quality standards and consumer requirements, nitrile gloves undergo a series of inspections from raw materials to finished products. Fengwang has summarized all the tests involved in the production process.
1. Raw Materials
To enhance production efficiency, controlling the quality of raw materials is crucial. Typically, tests include pH value and solid content analysis.
2. Acrylonitrile Content
Acrylonitrile is one of the primary monomers in nitrile glove production. Common testing methods include chemical analysis, spectroscopy, and chromatography. The raw acrylonitrile material contains varying levels of oxazole, and higher oxazole content can negatively impact the final product’s performance and color. Therefore, controlling oxazole content is critical.
3. Former Cleaning
Thorough cleaning of glove formers reduces defect rates. Operators regularly test the cleaning solution concentration to ensure optimal cleaning effectiveness.
4. Glove Weight, Thickness, Tensile Strength, and Elongation
These tests ensure consistent physical properties within the same batch, improving customer satisfaction.
5. Visual Inspection System
Before packaging, defective gloves (e.g., black spots, tears) are automatically detected and removed, reducing the defect rate.
6. Pinhole Test (Water Leak Test)
A sample of gloves undergoes a watertight test. The leakage rate determines whether the batch meets customer requirements.
7. Residual Powder Test
For medical-grade gloves, manufacturers test residual powder levels to ensure compliance with standards and user comfort.
8. Air Leak Test (Alternative Pinhole Detection)
Besides water testing, air inflation tests are conducted—gloves are inflated, and leaks are counted to determine the pinhole rate.
9. Chlorination Level Test
After testing, gloves meeting the low-chlorine standard are labeled with “Low Chlorine” and the specified range.
10. Surface Resistance Test
A surface resistance tester measures electrical resistance. Qualified anti-static gloves should have a resistance between 10⁶ – 10⁹ ohms.
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