Shǐyòng lièděng cáiliào huì yǐngxiǎng jiànzhú de ānquán.
Using substandard materials will affect the safety of the building.
Tips
usage
劣等 collocates with 品 (products: 劣等品), 材料 (materials), 货 (goods: 劣等货). It is more formal than the colloquial 烂 (terrible/crappy). Antonym: 优等 (yōuděng, superior/top-grade).