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Specification desk

bulk plastic jars

Resolve open choices that still block a comparable bulk plastic jars quote: resin, capacity, neck finish, lid liner, print process, and which food-contact files the named PET lot must carry. Accepting an alternative construction without those checks mixes two products on one price.

Neck-finish gauge on a PET jar, illustration only

Values to write before a factory substitutes

237 / 473 ml Common 8 oz and 16 oz bands to confirm

Write oz and ml. An 8 oz (237 ml) jar is not a 16 oz (473 ml) jar. Ask the factory to restate both units on the quote.

70-400 / 89-400 Neck finish the capper can run

Copying a catalog neck onto a different chuck produces leak complaints. State the line trial window, not a marketing maximum.

OTR / WVTR Only if the fill is aroma- or moisture-sensitive

Oxygen transmission rate and water vapor transmission rate belong on the named PET lot after the factory replies. They are not implied by the word PET.

PCR % Post-consumer recycled content if claimed

PCR PET is a different lot than virgin PET. A recycled-content claim attaches to the named batch, not to this website.

Open choice What must be verified When an alternative is acceptable
PET vs glass Weight, breakage, inert contact, recycling path Only if the buyer restates barrier, freight and presentation needs in writing
Virgin PET vs PCR PET Clarity, food-contact file, recycled-content claim Only if the substitute lot carries its own file, not a category letter
70-400 vs 89-400 Capper chuck, liner, leak test Only if the buyer accepts a new lid family and restates liner type
Plain vs decorated Color count, process, screen or digital setup Only if artwork status and extra costs are listed outside the piece price

Documents to request from the named factory

  • Resin and construction sheet

    Names PET grade, gram weight, and whether the jar is injection-stretch-blow or another process. A directory label is not this sheet.

  • Food-contact and migration testing file

    FDA 21 CFR and, if required, EU 10/2011. The file must name the quoted jar and lid. This website does not hold a site-wide food-contact badge.

  • Closure and liner specification

    Lid resin, liner type, and whether an induction seal is required. Missing liner data is a frequent cause of leaks that get blamed on "bad jars."

  • Factory quality file if the buyer asks

    ISO 9001 or BRCGS Packaging that names that plant. These are supplier files, not Pet Plastic Jars Sourcing certificates.

Checks in the order they usually block a quote

  1. Capacity and neck finish

    Confirm oz and ml, then write the neck finish. This is the first substitution error on mixed RFQs for bulk plastic jars.

  2. Lid and liner

    Restate lid resin and liner. Seal initiation temperature is added only when an induction liner will actually be sealed on the line.

  3. Print process trade-off

    Digital can reduce plate cost on short SKU lists. Conventional flexographic printing or silk screen often keeps unit cost and spot color steadier on long runs. Write which side the buyer accepts.

  4. Contact and recycling files

    Food-contact and post-consumer recycled content claims attach to the named batch. Glass can fit some food and personal-care packs that need inert contact; PET can cut shipping weight and breakage. Record the choice. Do not treat either side as a site slogan.

Return to the inquiry options or send the open specification list.

Send the open specification list

We will ask factories to quote the same capacity, neck finish and exclusions. We will not invent a savings percentage.

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