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Building a resistance to ignition testing device for sunglasses and analysing data: a continuing study for sunglasses
Renan Magri1, Mauro Masili1, Fernanda Oliveira Duarte1
1Electrical Engineering Department, Engineering School of São Carlos, University of São Paulo, Av. Trabalhador Sãocarlense 400, São Carlos, SP, 13566-590, Brazil.
Biomedical Engineering Online
|September 23, 2017
Summary
Sunglasses materials demonstrated excellent resistance to ignition, with all 410 samples passing the ISO 12312-1 standard. This indicates that commonly used materials in sunglasses are safe and do not pose a flammability risk.
Area of Science:
- Materials Science
- Ophthalmology
- Consumer Product Safety
Background:
- Sunglasses popularity necessitates safety standards like NBR ISO 12312-1:2015 in Brazil.
- Resistance to ignition is a key safety concern, preventing flammability from sources like cigarette sparks.
- Evaluating sunglasses performance provides insight into compliance with existing safety standards.
Purpose of the Study:
- To build and validate a system for testing sunglasses' resistance to ignition according to ISO 12312-1.
- To assess the compliance of 410 sunglasses samples with the resistance to ignition requirements.
- To evaluate the safety of materials used in contemporary sunglasses.
Main Methods:
- Developed a resistance to ignition testing system with a 650°C steel rod and a linear actuator.
- Utilized a Freescale FRDM-KL25Z board for control and a LabView interface for data acquisition.
- Tested 410 sunglasses samples (frames and lenses) adhering to the ISO 12312-1 procedure.
Main Results:
- All 410 sunglasses frames and lenses were tested for resistance to ignition.
- None of the tested samples burst into flames or continued to melt after the procedure.
- All assessed sunglasses complied with the ISO 12312-1:2013 resistance to ignition requirements.
Conclusions:
- Tested thermoplastic and thermosetting materials exhibit exceptional resistance to ignition.
- All sunglasses samples met the compliance criteria for the resistance to ignition test.
- The study assures that most sunglasses available to consumers are manufactured from safe materials.
