What risks are associated with recycled plastic safety fences?

There are multi-dimensional risks associated with recycled plastic safety fences, which need to be comprehensively considered in light of chemical toxicity, physical performance defects, and regulatory loopholes. The specific risks are as follows: 

I. Chemical Toxicity Risk 
Leaching of endocrine disruptors 
Regenerated plastics containing phthalate plasticizers (total sum > 0.1%) will accelerate the release under high temperature and exposure to sunlight, interfering with the human hormone system. Poor-quality recycled materials mixed with medical waste and pesticide packaging residues may contain carcinogens such as polyvinyl chloride (PVC) or phenol degradation products. 
Migration of heavy metals 
The lead and cadmium content in recycled plastic from informal channels exceeds the limit (lead > 90 ppm, cadmium > 75 ppm), and long-term exposure can cause neurological damage.

II. Physical Performance Defects 
Insufficient structural strength 
The molecular chains of recycled materials break, reducing the impact strength by more than 40%, and they are prone to cracking and forming sharp fragments under strong wind or impact. The flexibility of repeatedly recycled HDPE decreases, and the risk of brittle cracking increases in a low-temperature environment of -10℃. 
Fire hazards are prominent. 
Open-air stockpiles of recycled fences contain a large amount of flammable materials such as cardboard and foam plastic. Aging wires or welding sparks can cause a sudden and intense fire. The burning process releases highly toxic gases such as dioxins, and the difficulty of extinguishing the fire is higher than that of virgin plastic.

III. Regulatory and Compliance Loopholes 
The source is uncontrollable. 
More than 70% of recycled fences are made from mixed waste plastics, including sources such as cosmetic bottles and electronic waste shells, with complex compositions that are difficult to trace. During processing in small workshops, solvent residues (such as benzene series substances) remain, and the volatilization period can last up to six months. 
The testing standards are lagging behind. 
The current national standard GB/T 45091-2024 does not cover all types of harmful substances (such as environmental hormones, etc.); the residual rate of non-PET impurities in PET bottle flakes recycled materials exceeds 10%, but there is no mandatory testing requirement.

Four. Risk Prevention Suggestions
Risk Type    Preventive Measures
Chemical Toxicity    Choose virgin HDPE fences (BPA-Free certified), and avoid phthalate content > 0.01%
Structural Safety    Verify the wind resistance grade certificate (≥ Grade 8) and the low-temperature impact test report at -20℃
Compliance and Traceability    Require suppliers to provide GB/T 45090 recycled plastic labels and SVHC 210 items screening reports 

❗ Urgent Warning: The use of recycled plastic fences of unknown origin is prohibited in industrial areas. The microplastic particles (<5mm) they release can be inhaled and deposited in the lungs, causing chronic inflammation.