PP vs PPSU: Showdown in Plastic Water Cup Production (Part 4)

There are stories in every cup, and warmth in everyday life. Hello everyone, welcome to "Dong Dong's Cup Talk"

Summer is the peak sales season for plastic water cups. At this time every year, many customers who are confused about material types leave me messages. Their questions vary in form, but all revolve around material safety. Many people worry that inferior plastic cup materials may harm their health. https://www.zhanyict.com/en/ProductsDetail-VB-10235.htmlToday I will conduct an in-depth analysis of the two most easily confused material pairs: the differences between PC and PCTG, as well as between PP and PPSU.

With years of in-depth experience in the water cup industry, I will refer to technical data from our factory’s professional material engineers, combined with mass production trials, performance test results and real application scenarios. https://www.zhanyict.com/en/ProductsDetail-VB-10235.htmlI’ll sort out the core differences among these four materials, analyzing them from the dimensions of safety, mechanical performance, temperature and drop resistance, and applicable crowds. This helps you clearly distinguish materials that look similar and choose the right drinking container.

Both PP and PPSU are BPA-free, safe high-temperature resistant materials, widely used in maternity & infant water cups, baby bottles, https://www.zhanyict.com/en/ProductsDetail-VB-10235.htmlvacuum flask liners and other products. Although both highlight safety, they differ greatly in performance, durability and cost, positioning PP as the budget basic version and PPSU as the high-end maternity & infant grade.

3. Comparison of Human Safety

Both materials comply with food contact safety standards and contain no harmful substances such as BPA or phthalates, https://www.zhanyict.com/en/ProductsDetail-VB-10235.htmlyet they differ significantly in structural stability:

PP Material

It is a basic food-safe material, but prone to aging. The risk of microplastic precipitation rises noticeably after aging. https://www.zhanyict.com/en/ProductsDetail-VB-10235.htmlIt is recommended to replace PP cups every 6–12 months and avoid long-term repeated use.

PPSU Material

It is a medical-grade safe material with an extremely stable molecular structure. No harmful substances leach out even after long-term use, and its service life can reach 3–5 years. As the preferred material for high-end maternity and infant products, https://www.zhanyict.com/en/ProductsDetail-VB-10235.htmlit delivers top-tier safety and durability.

4. Drop Resistance with Equal Wall Thickness (Factory Actual Test)

Test setup: The same style of maternity & infant water cup with a uniform wall thickness of 3.0 mm, injection molded respectively with PP and PPSU raw materials. https://www.zhanyict.com/en/ProductsDetail-VB-10235.htmlA 1.5-meter drop test is conducted on cement ground, combined with high-temperature steaming aging treatment.

- PP Water Cup: No damage after 5 drops at room temperature. However, after 10 rounds of high-temperature steaming, the cup body softens and deforms slightly, and cracks appear upon subsequent drops. https://www.zhanyict.com/en/ProductsDetail-VB-10235.htmlAfter long-term use, the surface is covered with scratches and tends to harbor dirt and bacteria.

- PPSU Water Cup: No cracks or deformation after 15 drops at room temperature. Even after 50 rounds of high-temperature steaming, its performance remains unchanged — still rigid, wear-resistant, https://www.zhanyict.com/en/ProductsDetail-VB-10235.htmlfree of deformation and scratches. Its drop resistance and aging resistance are far superior to PP.

Test Conclusion: With the same wall thickness, PPSU boasts over 3 times the drop resistance and aging resistance of PP. https://www.zhanyict.com/en/ProductsDetail-VB-10235.htmlPP is suitable for short-term use, while PPSU is ideal for long-term and high-frequency use.