A cannabis jar is child-resistant only as a tested pair: the certificate under 16 CFR 1700.20 covers one specific jar with one specific lid, and it does not carry over to another jar even when the nominal neck finish is identical. So buy the jar and its CR lid together and ask for the lab report that names both model numbers. For flower, the 2oz (60ml) jar with a 53-400 CR finish is the format most brands start from, because it holds an eighth (3.5g), the fastest-moving retail unit in US cannabis.
Who should buy certified CR glass
Certified glass suits licensed brands packing flower in 1oz–4oz jars, concentrate producers who need small airtight jars, and co-packers who have to produce child-resistance documents at a state audit. It is a poor match for hemp-derived products sold in states with no CR mandate, where an ordinary continuous-thread jar does the job for less, and for very small runs, which domestic CR-jar distributors already hold in stock.
The wider rule set, including opacity laws, state label differences and the choice between jars, tubes and bags, belongs to packaging compliance in general. What follows deals with the jar itself: size, lid, glass treatment and the checks behind them.
Jar sizes, neck finishes and fill weights
Cannabis glass falls into two families. Flower goes into wide-mouth jars, since whole buds need an opening of 53mm or more to go in without crushing the trichomes. Concentrates go into small straight-sided jars. Every pairing in the table is certified as a system to ASTM D3475 and 16 CFR 1700.20.
| Model | Capacity | Neck finish | Jar weight | Typical fill | Pieces per 40HQ |
|---|---|---|---|---|---|
| CR-5 micro | 5ml–7ml | 33-400 CR | ~20g | 0.5–1g concentrate, samples | ~520,000 |
| Concentrate jar, low-profile | 9ml–15ml | 38-400 CR | ~28g | 1–2g wax, rosin or live resin | ~320,000 |
| CR-30 straight jar | 1oz (30ml) | 38-400 CR | ~55g | 1–3.5g flower or 1g concentrate | ~180,000 |
| CR-60 straight jar | 2oz (60ml) | 53-400 CR | ~95g | 3.5g (eighth) flower | ~110,000 |
| CR-60 wide-mouth | 2oz (60ml) | 58-400 CR | ~100g | 3.5g hand-trimmed flower | ~100,000 |
| CR-90 wide-mouth | 3oz (90ml) | 58-400 CR | ~130g | 7g (quarter) flower | ~78,000 |
| CR-120 wide-mouth | 4oz (120ml) | 70-400 CR | ~165g | 14g (half ounce) flower | ~58,000 |
| CR-240 storage | 8oz (240ml) | 70-400 CR | ~290g | 28g (ounce) flower, cure jars | ~30,000 |
The container counts assume lids are nested in their own cartons, apart from the jars, so the CR mechanism is not stressed in transit. For formats below 1oz, see the 1-gram glass jars for samples and micro-doses; the eighth-ounce size is covered in more detail under 2oz jars with lids.
Humidity packs and flower
Retail flower is kept at 58–62% relative humidity, usually with a two-way humidity pack. The standard pack sizes are 1g, 2g, 4g and 8g, and the pack has to sit in the jar without pressing on the buds.
- A 2oz jar with 3.5g of flower takes a 1–2g pack laid flat on top, under the lid.
- A 4oz jar with 7–14g takes a 4g pack, or sometimes two 2g packs for more even distribution.
- A 38mm neck is too narrow: the pack goes in sideways and creases, which damages its membrane. Finishes of 53mm and wider avoid this.
Sealing choices across jar formats are compared under airtight glass jars.
Concentrate jars
Concentrates call for low-profile 9–15ml jars with a wide mouth, so a dab tool can reach the product. Sticky live resins are often packed with a silicone or PTFE insert, because bare glass only lets the product go cleanly when the inside wall has a polished fire finish. The low-profile shapes sit in the herb and spice jar range.
How child-resistance certification works
Two documents are involved. ASTM D3475 classifies the type of closure mechanism, such as push-and-turn or squeeze-and-turn. 16 CFR 1700.20 is the test protocol. A certificate cannot be moved from one jar to another with the same nominal finish, because the depth of thread engagement and the torque window differ between moulds.
The protocol uses two panels. A panel of 50–200 children aged 42–51 months tries to open the package in two 5-minute periods, with a visual demonstration between them. A second panel of 100 adults aged 50–70 must be able to open the package and close it again properly, with 90% success required. A package that seniors cannot open fails just as surely as one that children can.
In practice the sequence runs like this:
- The supplier submits 50–100 samples of the exact jar, lid and liner, representative of production.
- The lab runs the child panel.
- The senior-adult panel tests opening and reclosure.
- A package that fails the child panel goes to failure-mode analysis.
- The lab issues a report with the full package description, the mechanism classification and the panel statistics.
- During ongoing production, a dimensional certificate of analysis (COA) for each lot shows that what ships still matches what was tested.
Documents to ask a supplier for
- A third-party report from an accredited lab that names your exact jar model and your exact lid model.
- The date of that report. If it is older than the tooling now in use, ask for confirmation that no dimension has changed.
- A signed statement that production tolerances match the tested samples.
For the certified jar-and-lid pairings we supply, this paperwork travels with the order; confirm the current scope of the test certificate when you enquire. Change the lid vendor or customise the jar neck and the pairing has to be tested again, and we will say so plainly.
Amber, frosted or opaque-coated glass
Ultraviolet light converts THC to CBN, and studies of stored flower report potency losses in double-digit percentages over months of exposure. Several states also require opaque or UV-blocking packs outright. Glass offers three routes.
| Treatment | What it does | Limitation |
|---|---|---|
| Amber glass | The lowest-cost true UV barrier; blocks roughly 90%+ of light below 450nm | Hides the flower from shoppers, and some state "opaque" wording can be read as excluding it |
| Frosted glass | Acid-etched or sandblasted surface that diffuses light | Does not reliably count as opaque: against a light source the contents show as a silhouette |
| External opaque coating | Hides the contents completely; the coating is on the outside, so the product never touches it | Needs a brand colour reference |
Most "opaque" statutes require that the contents cannot be seen, which is why amber on its own is usually not enough. The pattern most brands end up with is a clear or amber jar, an opaque outer coating, a certified CR lid and a compliant label. Options are shown under amber glass jars with lids and frosted glass jars. Tell us the state and we can flag which treatments have passed buyer audits there, though the final compliance decision rests with your counsel.
Quality checks on each lot
Lots are sampled at AQL 2.5. The inspection covers four things:
- Finish dimensions, with go/no-go gauges on the CR finish. A thread error of 0.5mm can be enough to defeat the child-resistant engagement.
- Annealing stress, read on a polariscope, grade ≤3.
- Thermal shock at a 42°C differential, which matters for jars hot-filled with concentrate.
- Drop test: 0.8m onto concrete, filled and in the shipper carton.
Torque is checked separately. Application and removal torque on every lot are compared with the window specified for the certified lid, typically 8–14 in-lbs application for 53-400 CR closures. Torque outside that window is the most common reason a certified package fails in the field.
Packing, freight and shipping documents
Jars and lids go in separate cartons inside one container, with lids nested at about 2,000–4,000 per carton depending on size. Pallets are plywood compliant with ISPM-15, so no fumigation certificate is needed at destination. Jar formats can be browsed in the glass jar collection.
Each shipment carries a commercial invoice, packing list, certificate of origin, FDA food-contact statement, migration summary, a copy of the CR certificate and the per-lot COA with torque windows. Most state cannabis regulators accept food-contact documentation as the base standard for the material.
What to include in a quote request
Pricing is worked out per project and depends on the mould, decoration, quantity and freight terms. Stock jars carry no mould fee. Five details make the request complete:
- Jar size and format: a 1oz, 2oz, 3oz or 4oz flower jar or a low-profile concentrate jar, plus the target fill weight.
- States of sale, which settle the opacity requirement and the certification reports you need.
- Glass treatment: clear, amber, frosted or opaque-coated.
- Lid: the certified CR lid in a stated colour, or a lid you supply, in which case we flag the re-certification it triggers.
- Quantity and destination: sets per SKU and the delivery state or port.
Say also how you buy, for example one brand with one site or a co-packer filling at several, because that changes the document bundle more than anything else. You can ask for samples first or send the RFQ directly.
Frequently asked questions
What should we do if CR lids fail after filling?
Look at the capping line first. Field failures nearly always trace back to application torque drifting out of its window. Keep 20 retained samples from each batch so there is something to measure against.
Can jars and lids come in different colours without raising the minimum order?
Minimums are set per project. They depend on the mould and the line it runs on, so colour splits are assessed case by case.
Should humidity packs be shipped inside the empty jars?
No. The packs have a shelf life and should stay in their sealed overwrap, packed apart from the glass, until they are inserted on your filling line. They can be cartoned in the same consignment if you source both together.
Is there a compliant alternative to glass for a value line?
PET with certified CR closures costs less and dominates the value tier. Glass holds mid-shelf and above, where weight and inertness support the price point. Many brands run both materials side by side.
Can jars go to a co-packer and lids to another facility?
Yes. Cartons are labelled by destination under a single PO, and the certificate covers the pairing wherever the two parts meet. Pass the torque window from the lot COA to the co-packer so the chuck heads are calibrated before the first pallet arrives.
Does the certificate still apply if we later pack gummies or edibles in the jar?
It does, because certification attaches to the package and not to its contents. Edibles often bring their own label and opacity rules, though, so re-check those for your state before reusing a certified container for another product line.