1. Material Safety Certifications
FDA/EU Compliance: Ensure caps meet FDA 21 CFR or EU 10/2011 standards for food-contact safety.
BPA-Free Testing: Optimize for keywords like “BPA-free plastic caps” as 68% of buyers prioritize non-toxic materials.
2. Performance & Durability
Leak-Proof Testing: Highlight ASTM D4991 or ISO 8317 certifications for phrases like “child-resistant closures” or “tamper-evident caps”.
Temperature Resistance: Use terms like “high-temperature plastic caps” to target industrial buyers.
3. Sustainability Standards
Recycled Material Certifications: Target eco-conscious searches with “PCR plastic caps” (Post-Consumer Recycled) or “ISO 14001-compliant caps”.
Lightweight Design: Rank for “eco-friendly bottle caps” by emphasizing reduced material waste.
⑴Specification requirements:
①Internal dimensions (±0.15mm): thread inner diameter, inner plug outer diameter, top wall thickness
②External dimensions (±0.30mm): the outer diameter of the cover, the overall height of the cover
③Other indicators: single weight (±0.10g)
⑵Appearance requirements:
① Cover surface: full molding, complete structure, no material shortage, no obvious damage, burrs and deformation;
②The color of the cover body: it conforms to the allowable limit of the standard sample, and the color is uniform;
③Sealing ring: no damage, deformation, strain;
④Side seal and top seal: no air bubbles or damage;
⑤Thread: Slight strain on the thread at the non-starting point is allowed, not less than the lower limit of the inner diameter of the thread;
⑥Connecting bridges (tangent points): no breakpoints, adhesions or not full;
⑦ Gate (injection cover): no perforation or cracking, no obvious gate residue or depression;
⑧ Pollution: no oil, dirt, rust, impurities;
⑨Printing: The pattern is clear, there are no defects such as missing printing, missing printing, etc., which meets the allowable limit of poor color registration, cross-inking, and pattern color, and the allowable center deviation of partial printing is ±0.3mm.
(3) Printing pattern adhesion performance:
①Hot water immersion method (hot filling cover): no obvious discoloration
② Peracetic acid soaking method (sterile cover): no obvious decolorization
③Tape sticking and peeling method: no obvious discoloration
⑷ Sealing performance:
① 700kPa×1min, boost speed 35kPa/sec, no air leakage or tripping
②LB angle (leakage angle - broken ring angle):
>0, squeeze the bottle body before opening the cap and breaking the ring without water escaping
⑺ Physical properties of anti-theft ring:
①Covering performance: the cover body and anti-theft ring will not be deformed, broken or retracted after the cover is closed;
② Anti-theft performance: After opening, the connecting bridge should be obviously damaged;
③Opening torque (lbf.in): ring breaking torque (lbf.in)
Hot charging cover (pressure): 13～18 5～9
Hot charging cover (Note): 15～18 5～9
Sterile cover: 10～16 8～12
Injection water cap: 6～14 5～9
Compression plastic water cover: 6～14 5～9
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