Will long-term contact with plastic safety fences release harmful substances?

Whether long-term contact with plastic safety fences will release harmful substances needs to be comprehensively judged based on their material, usage environment and manufacturing process. The following are the key conclusions and analyses: 

I. Potential Risk Factors 
Chemical release under high temperatures or ultraviolet radiation 
Plasticizer leaching: Inferior products may release phthalate plasticizers (endocrine disruptors) at temperatures above 60°C or after prolonged exposure to sunlight.
Antioxidant decomposition: Some antioxidants in aged fences may degrade into toxic compounds such as phenol. 
Physical damage leads to the release of particles. 
Microplastic particles (<5mm) generated by wear or impact may enter the human body through the respiratory tract or skin contact, causing chronic inflammation.

II. Safety Fence Protective Design
Protective Process Function
Food-grade HDPE base material The original HDPE does not contain BPA/ formaldehyde, has stable chemical properties, and has no release risk at room temperature.
UV stabilizer reinforcement Delays photo-oxidation, ensuring a color fading rate of <15% within 5 years and reducing high-temperature degradation products.
Heavy metal-free formula Lead ≤ 90ppm, Cadmium ≤ 75ppm (compliant with national migration limit values).

III. Risk Level Assessment by Scenario 
Low-risk scenarios 
Outdoor use at normal temperature (-40℃ to 60℃): HDPE fences that meet national standards have extremely low risk of releasing substances.
Industrial areas / traffic separation: Low dust adsorption and limited direct contact with human body. 
Be vigilant in the following scenarios. 
High-temperature exposure environment (>60℃): Inferior recycled plastic fences may release olefin gases.
Areas with frequent contact by children: Infants and toddlers biting may lead to trace intake of plasticizers.

IV. Safety Usage Recommendations
Prefer original HDPE material
Look for GB 4806.7 food safety certification to avoid phthalate plasticizers.
Regular inspection and maintenance
Replace when surface cracks or fading exceed 30% to prevent microplastic shedding.
High-temperature environment protection
Cover with sunshade cloth in summer exposure areas to lower surface temperature. 

Comprehensive Conclusion:
Under compliant usage, the risk of release from standard HDPE plastic safety fences is controllable. However, three situations should be avoided:
① Using inferior products made from recycled materials;
② Long-term exposure to environments with temperatures above 60℃;
③ Direct contact of infants and toddlers with unverified fences.