Fluted Glass Tumbler

This fluted glass tumbler is built with food‑grade 3.3 high‑borosilicate glass feedstock. Boron content falls within 12.5%‑13.5%, granting low thermal‑expansion index and outstanding acid‑alkali resistance. The material safely endures temperature swings ranging from ‑25℃ up to 145℃, resisting cracking under sudden hot‑cold alternation. Skilled artisans perform manual hot‑blowing for each cup body; vertical fluted textures are shaped via precise mould‑assisted blowing under high‑temperature status. After forming, every tumbler goes through gradient long‑time annealing treatment to eliminate inner glass stress, improving anti‑thermal‑shock and drop‑resistant performance. Cup rim receives fine fire‑polishing procedure to remove sharp burrs. No recycled glass fragments are adopted during whole manufacturing flow so as to avoid potential heavy‑metal precipitation risk. Each finished piece will go through multi‑round manual visual screening; goods containing visible bubbles, uneven flutes or distorted rim will be eliminated before packing

Distinct vertical fluted texture is not merely decorative. Raised ridges deliver extra friction when gripping wet cup surface, effectively preventing slipping out of hands. Ultra‑clear transparent glass maximizes light refraction; layered iced drinks, fruit infusions and craft sodas display gorgeous visual layers, creating eye‑catching shooting effects for social‑media content creation. Smooth inner wall greatly lowers beverage residue adhesion. Milk foam, fruit pulp and syrup remnants can be washed away rapidly under running tap water. Uniformly polished cup lip brings soft touching feeling while sipping beverages. The tumbler is lead‑free and BPA‑free, fully complying with global food‑contact safety norms. Moderate wall thickness strikes nice balance between lightweight feeling and daily‑use durability. It does not absorb peculiar smell from tea, coffee or fruit beverages, enabling users to switch different drinks without cross‑odor trouble

Apart from household daily drinking and ordinary café iced‑coffee serving, this fluted tumbler fits plenty of under‑mentioned niche scenarios.

• Resort clubhouse beverage stations: serve homemade spritz and fruit‑infused water for club guests inside lounge zones.
• Catering vocational training institutes: be deployed for bartending practical courses for trainee mixologists.
• Florist‑café hybrid stores: match vintage interior tone for selling craft drinks to visiting customers.
• Community public activity centers: be adopted as reusable drink container for summer public welfare events.
• Luxury yacht hospitality supporting supplies: used for onboard non‑alcoholic mixed beverages for short‑voyage passenger reception

• Standard bulk‑wholesale packing: each tumbler wrapped individually with shock‑resistant bubble film, placed into neutral white inner box, then consolidated into five‑layer reinforced export carton filled with buffer filler to reduce collision risk during long‑haul ocean transportation.
• Custom retail‑oriented color gift boxes can be arranged. Main loading port is Tianjin Port. Shipping modes include sea freight for FCL/LCL container cargo, air freight for urgent small‑batch orders, and client‑nominated freight forwarder is acceptable
• Production lead‑time: stock items 7‑12 working days; logo‑printed custom bulk‑orders 20‑27 working days after deposit confirmation. We provide formal breakage‑compensation mechanism for damage caused by international transit