Start with the exact selected material record
The selected C-KDL626 and C-KCL90 pages identify PET. The selected EP-ST770 straw identifies PLA. The reviewed offers do not include a PP or PS lid merely because those materials appear elsewhere in a supplier’s catalog. A material abbreviation is one part of a product record; it does not identify the exact rim, opening, case quantity or intended temperature. Keep those other fields rather than making material the sole compatibility rule.
Do not transfer conditions across a resin name
FDA’s food-contact reference distinguishes food types and conditions of use. The existence of a food-contact framework does not certify this entire cup-and-lid assembly for every beverage and temperature. The site does not infer hot-fill, microwave, freezer or repeated-use permission from a generic PET, PP, PS or PLA label. Applicable current product documentation needs to support the actual intended use. The selected records here remain a cold-service shopping scope.
Separate a material comparison from a performance test
The site has not measured stiffness, crack resistance, heat transfer, taste or seal behavior of these supplies. A comparison table can faithfully list PET or PLA without creating a ranking for those untested properties. If a business needs a particular operational characteristic, ask the maker for the current applicable evidence and exact product scope. Do not use another supplier’s marketing description of a resin family as a measured result for these selected items.
Keep waste-route questions separate too
A material name does not establish local collection. A PLA compostability claim needs its certification context and an accepting commercial program; a PET description does not settle whether a local collector accepts that exact small lid. These are separate questions from which lid matches a named cup. The local tools return source relationships and count arithmetic only. They do not label a complete order as legally compliant, locally recyclable or universally compostable.
Ask for an exact alternative rather than a resin substitute
A supplier proposing a PP lid in place of one selected PET item should identify the actual alternative code, opening, matching cups and applicable service conditions. The site has no evidence that a material swap preserves those details. Until the alternative has its own record, retain the existing selected supply as a separate row. A material abbreviation and the same case quantity cannot establish that the substitute is equivalent.
Sources & scope
Checked November 4, 2026. Manufacturer and retailer references support the specific statements. Dated displayed prices are not final checkout quotes, performance rankings or performance testing. This shopping reference does not replace the exact product label or qualified individual advice. Current received labels, actual fitted configuration and independent food-contact/material/compatibility/content/commerce review remain pending.
Karat / LollicupStore: C-KDL626 exact current offer and matching-cup list ↗
Karat / LollicupStore: C-KCL90 exact current offer and matching-cup list ↗
Eco-Products: EP-ST770 current case/pack and specifications ↗
FDA: Food Types and Conditions of Use for Food Contact Substances ↗
Keep reading
Does compostable mean the straw belongs in every compost bin? ↗