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Technical specifications for bottle and container procurement.

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Buyers decide on bottle and container specifications based on material grade, closure fit, and compliance requirements. This site covers the technical choices that affect production run costs, shelf life, and regulatory approval.

Content is organized by product type and procurement stage. It covers glass bottles, PET, jars, and closures. It also addresses materials, decoration, cost structures, and supplier evaluation criteria.

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Start with the stage of the sourcing process you are in.

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A factory line assembling clear and colored glass bottles.
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Frequently asked questions

What is the difference between PET and rPET for beverage bottles?

PET is virgin polyethylene terephthalate. rPET is recycled PET made from post-consumer or post-industrial waste. rPET often requires stricter food-grade testing and may have different clarity and strength characteristics than virgin PET.

How do I specify glass bottle weight to suppliers?

Specify both the filled weight (including liquid) and the empty bottle weight. Also define the neck finish diameter and thread type to ensure closure compatibility. Tolerance ranges for weight are typically requested in the technical data sheet.

What documents should I request from a plastic bottle supplier?

Request a material certificate of analysis (CoA), food contact compliance documentation, and test reports for specific properties like drop height, pressure resistance, and color fastness. For imported goods, check if a certificate of origin is required.

What is MOQ and how does it affect unit cost?

Minimum Order Quantity (MOQ) is the smallest batch size a supplier will produce. Custom molds or specific colors often raise the MOQ. Unit cost generally decreases as order volume increases above the initial MOQ due to fixed tooling costs being spread over more units.

How do I verify jar and lid compatibility?

Define the jar mouth diameter and thread standard (e.g., 32mm, 38mm). Request a physical sample of the jar and lid together to check torque, seal integrity, and stackability. Verify if the lid requires a separate liner or is a single-piece plastic closure.

What are common issues with custom decoration on containers?

Common issues include color mismatch between the screen print and the physical bottle, ink adhesion failure, or damage during filling and labeling. Always require a pre-production sample for decoration approval and specify the exact Pantone color code if applicable.