How can you detect whether XPS sandwich panels contain recycled material? What are the engineering risks?

Recycled XPS typically undergoes multiple thermal histories, degrading molecular chains and increasing aged products (oligomers, styrene monomer). Detection methods: 1) Microscopic cell structure observation – recycled material shows uneven cell sizes and black impurities; 2) Melt flow index measurement – recycled material MFI increases (>10 g/10min); 3) UV spectroscopy to measure styrene monomer content (excess indicates recycled content); 4) TGA shows altered mass loss peak shape around 350°C. Engineering risks: recycled material shows accelerated compressive creep, with 5–10% thickness loss within 5 years; peel strength with metal facings drops by 50% due to low molecular weight exudates; and during fire, it releases more toxic black smoke.

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How can you detect whether XPS sandwich panels contain recycled material? What are the engineering risks?

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