【Inspector Encyclopedia】Introduction to Sunglasses Testing Methods and Standards, China Inspection and Quarantine Inspection, Factory Inspection, Certification and Testing

1. Overview and Importance of Sunglasses Inspection

Sunglasses, as specialized products that combine protective functions with fashionable decorative features, have a direct impact on consumers' vision health and safety. From an inspection perspective, sunglasses quality control requires adherence to strict standards and procedures. This article comprehensively explains the quality testing standards, inspection methods, and key points for sunglasses from an inspector's perspective, providing practical reference for QC personnel.

2. Preparation before inspection and factory audit

1. Supplier qualification review

• Check the quality system certification status of the manufacturing company (ISO9001, ISO13485, etc.)

• Review product certification information (CE, FDA, AS/NZS, etc.)

• Verify the validity of production licenses and product test reports

2. Production environment assessment

• Check the cleanliness level and temperature and humidity control records of the dust-free workshop

• Evaluate production equipment maintenance and calibration records

• Review raw material procurement and warehousing management processes

3. Preparation of inspection equipment

• Spectral transmittance tester calibration verification

• Confirmation of the status of testing equipment such as focal meters and thickness gauges

• Inspection of impact test equipment and flame retardant test equipment

3. Sunglasses Quality Standard System

1. Major international standards

• American Standard : ANSI Z80.3 (Medical Devices)

• European Standard : EN 1836 (Personal Protective Equipment Directive 89/696/EEC)

• Australian Standard : AS/NZS 1067

• Chinese standards : QB2457, GB10810.3

2. Principles for selecting inspection standards

• Determine applicable standards based on target market

• Confirm customer special requirements and acceptance criteria

• Develop corresponding inspection plans and AQL acceptance standards

4. Key Items and Inspection Methods for Sunglasses

1. UV protection performance test

Inspection standards :

• UV-100 PROTECTION: Filters out more than 90% of UV rays

• UV-400 PROTECTION: 100% UV filter

Inspection method :

• Use a spectral transmittance tester to measure the transmittance in the 280-400nm band

• Verify the consistency between the UV label on the lens and the measured data

• Record UVA (315-400nm) and UVB (280-315nm) transmittance

Acceptance requirements :

• The average transmittance of UVB band does not exceed 5%

• The average transmittance of UVA band does not exceed 30%

2. Optical performance inspection

Refractive index test :

• Measuring lens power using a lens meter

• The refractive power deviation of a single lens does not exceed ±0.08D

• The difference in diopter between the two lenses does not exceed 0.12D

Prism detection :

• Horizontal tolerance: 0.25△(BI) to 1.00△(BO)

• Vertical tolerance: no more than 0.25△

Inspection records : Detailed records of measurement data and deviation values

3. Lens material and quality inspection

Material Type Identification :

• Resin lenses (CR-39, PMMA)

• Glass lenses

• Polycarbonate (PC) lenses

Surface quality inspection :

• Check the center area of ​​the lens against a light and dark background

• Check for defects such as bubbles, scratches, impurities, mildew, etc.

• There shall be no Huoguang or spiral defects within the 30mm diameter area

Inspection method :

• Check surface quality using a magnifying glass

• Sampling inspection according to AQL standards

• Record defect type and quantity

4. Mechanical strength test

Impact test :

• Use a 16mm steel ball to drop freely from a height of 1.27m

• Impact lens geometric center diameter within 16mm

• Check for cracks or fragments in the lens

Extrusion test (EN 1836 and AS/NZS1067 requirements):

• Use a 22mm diameter steel ball to apply a pressure of 100±2 Newtons

• Speed ​​not exceeding 400mm/min

• Check if the lens is broken or deformed

Nose bridge deformation test :

• Use nose bridge deformation tester to pressurize

• The deformation percentage does not exceed ±2%

• The lenses must not fall out of the frame

5. Flame retardant performance test

Test method 1 (EN, AS/NZS, QB standards):

• 650±20℃ steel rod contacts the sample for 5±0.5 seconds

• Observe whether the sample continues to burn

Test method 2 (ANSI standard):

• Place at 200±5℃ for 15±1 minutes

• Observe whether the sample burns

Acceptance criteria : The sample must not continue to burn

5. Inspection process and quality control points

1. Incoming Quality Control (IQC)

• Check the quality of raw materials and accessories

• Verify the test report provided by the supplier

• Conduct preliminary performance testing

2. In-process inspection (IPQC)

• Monitoring production process parameters

• Check the quality of semi-finished products

• Recording production process data

3. Final Quality Control (FQC)

• Sampling according to AQL standards

• Conduct comprehensive performance testing

• Check packaging and labeling

4. Outgoing Quality Control (OQC)

• Check the consistency between product and order requirements

• Check packaging integrity and labeling accuracy

• Issue inspection report and certificate of conformity

6. Common quality problems and solutions

1. Inadequate UV protection

• Cause: Lens material problem or coating process defect

• Processing: Return the entire batch and ask the supplier to improve the process

2. Optical performance is unsatisfactory

• Cause: Insufficient mold precision or improper production process control

• Processing: Screen qualified products, rework or scrap unqualified products

3. Surface defects

• Reason: production process or packaging and transportation problems

• Processing: Screening and rework according to AQL standards

4. Insufficient mechanical strength

• Cause: Improper material selection or production process problems

• Processing: Return the entire batch and ask the supplier to improve

7. Inspection Records and Reports

1. Inspection data records

• Record all test data in detail

• Attached test conditions and equipment information

• Preserve test samples and photographic evidence

2. Contents of the inspection report

• Basic product information and production batch

• Inspection standards and sampling plans

• Test results and quality judgment

• Description of non-conforming items and suggestions for improvement

3. Quality traceability records

• Record raw material batches and production information

• Save inspection data and test reports

• Establish a product quality traceability system

8. Inspection precautions

1. Standard update attention

• Keep abreast of updates on national standards

• Adjust inspection standards and methods

• Update inspection equipment and tools

2. Customer special requirements

• Confirm the customer's special inspection requirements

• Develop targeted inspection plans

• Recording and reporting special circumstances

3. Seasonal considerations

• Pay attention to the impact of temperature and humidity on test results

• Adjust inspection environment conditions

• Consider the impact of transportation and storage conditions

IX. Summary

Sunglass inspection is a systematic quality assurance process that requires inspectors to possess specialized knowledge and extensive experience. Through rigorous inspection procedures and scientific testing methods, the quality, safety, and stable performance of sunglass products can be ensured. Inspectors are advised to continuously learn new knowledge and promptly update inspection standards to enhance the professionalism and effectiveness of their inspection work and provide consumers with safe and reliable sunglass products.