The short answer
Pin down the exact grade first (from a data sheet, a bag label, your molder or the material code on the drawing). Then decide on prime or recycled, pick a package size you can receive and store, ask for a sample, and send the supplier the grade, color, quantity and ship-to city. Check the COA against the bag label when the resin arrives, and dry it before molding if the resin calls for it.
Buying resin for the first time is mostly about asking the right questions in the right order. Engineers and startups usually get stuck on the grade. Small molders usually get stuck on minimums, freight and terms. This guide covers both.
1. Identify the grade
"Nylon" or "polypropylene" is a family, not something you can order. Within a family there are hundreds of grades that differ in melt flow, filler, additives and color. Find the grade from one of these:
- The data sheet from a previous supplier or the part designer.
- The bag or gaylord label: a photo of it shows the producer's grade name, color code and often the lot number.
- Your molder: if someone else molds the part, ask exactly which grade and color they run.
- The drawing or the part: a material code such as >PA66-GF30< tells you the family and filler. Our material code decoder explains the abbreviations. A code narrows the search, but it is not a specific grade.
2. What a grade name tells you
Grade names are set by each producer and follow no common standard. They often carry clues: a number tied to melt flow or viscosity, a filler code (GF30 means 30% glass fiber), letters for flame retardant, UV or heat stabilization, and a color suffix (natural, black, or a color number). Because the scheme differs between producers, never assume two similar-looking names are the same material. When in doubt, send the data sheet.
3. Prime, off-grade or recycled
Prime resin meets the producer's specification and comes with a lot COA. Off-grade and wide-spec material is outside that specification on at least one property. Recycled resin (post-consumer PCR or post-industrial PIR) has its own, usually wider, spec range. If the part has a drawing callout, a customer approval or a regulatory requirement, buy prime. See prime vs. off-grade vs. regrind.
4. Packaging and order size
| Packaging option | Typical size | Best for |
|---|---|---|
| 25 kg / 55 lb bags | 55 lb each; often 40–55 bags on a pallet | Specialty and high-cost resins, sampling, very small runs |
| Gaylord box | ~1,000–1,600 lb, depending on the resin | First orders, engineering grades, most small and mid-size molders |
| Bulk bag (super sack) | ~1,000–2,200 lb | Plants with a bag unloader |
| LTL (several gaylords) | 1 to about 6 gaylords | Steady monthly use below a full truck |
| Truckload | ~40,000–45,000 lb | High-volume grades; lowest freight per pound |
| Bulk truck or railcar | ~40,000–50,000 lb (truck); ~180,000–210,000 lb (railcar) | Plants with silos |
Typical net weights; actual weight depends on the resin's bulk density, the packaging and carrier limits. Check the net weight on the quote.
Most first orders are one gaylord. A gaylord sits on a standard pallet, so you need a forklift or pallet jack and floor space for it. More detail in gaylord vs. LTL vs. truckload and small-quantity resin.
5. Lead times
Lead time depends on the material, grade and volume. Common stocked grades ship sooner; specialty, custom-colored and compounded grades can take several weeks. Ask for the lead time on the quote and plan your first production run around it, not around the quote date.
6. What comes with the resin
Each lot should ship with a COA, the lot test report: lot number, grade, measured values (often melt flow, moisture, density or ash) and the specification limits. When it arrives, match the lot number on the COA to the label and file both. See what a COA shows. Compliance letters (FDA, UL, RoHS) are separate documents; ask for them if your part needs them.
7. Freight basics
Quotes are either FOB origin (FOB the warehouse: the price covers resin loaded at the shipping point, with freight separate) or delivered (freight to your dock included). Our standard terms are FOB the warehouse. When you compare suppliers, compare like with like. Single gaylords move LTL, so freight per pound is higher than on a truckload. If the site has no dock, ask for liftgate delivery and confirm it on the quote, and mention a residential or limited-access address up front.
8. Storage and drying
Store resin indoors, off the floor, in its sealed liner. Polyolefins and polystyrene seldom need drying. Nylon, PC, PET, PBT and similar resins absorb moisture and must be dried in a desiccant dryer before molding, for example around 80°C / 176°F for nylon 6 and 120°C / 248°F for polycarbonate. Reseal opened bags and gaylord liners. The resin drying guide lists temperatures and moisture targets by family.
9. Samples, payment and credit
A sample lets you or your molder run a trial before committing to a full package. Expect many suppliers to ask for prepayment on a first order and to offer open terms after a credit application. ResinBridge offers ~50 lb samples upon credit approval, takes ACH, check or wire on first orders, and offers Net 30 after credit approval.
First-order checklist
- Confirm the exact grade and color, in writing, with whoever owns the part design.
- Decide prime or recycled and any compliance documents you need.
- Work out quantity: part weight × parts per year, plus runner and scrap.
- Check receiving: dock or liftgate, forklift or pallet jack, receiving hours.
- Request a sample if the grade or source is new to you.
- Set up payment or credit before you need the material.
- On arrival, match the COA to the label, store it dry and sealed, and dry it before molding if required.
What to send for a quote
- The grade name from any supplier, or its data sheet (you can send just a data sheet)
- Color: natural, black or a custom match
- Fill type and percentage, and melt flow, if you know them
- Quantity for this order and what you expect to use in a year
- Ship-to city, and whether the site has a loading dock
We aim to send your quote within one to three business days.
Common questions
What is the minimum order for plastic resin?
Resin producers and many distributors sell by the truckload, but some suppliers start at one gaylord box. ResinBridge's minimum is one gaylord, roughly 1,000–1,600 lb depending on the resin.
How do I find out which resin grade I need?
Start with what you already have: a data sheet, a photo of the bag or gaylord label, the material code molded into the part or written on the drawing, or the grade your molder runs. If you have none of these, describe the part, what it must handle and how it is made, and a polymer chemist can suggest a grade.
What is the difference between prime and off-grade resin?
Prime resin meets the producer's published specification and ships with a lot COA. Off-grade or wide-spec material falls outside that specification on one or more properties, so it costs less but varies more. Buy prime for any part with a specification, customer approval or regulatory requirement.
What does FOB the warehouse mean?
The price covers the resin loaded at the shipping warehouse. Freight to your dock is separate, either arranged by you or arranged by the seller and billed, and ownership and risk generally pass to you when the carrier picks up. A delivered price includes freight to your door.
What if my building has no loading dock?
Tell the supplier when you ask for a quote. LTL carriers can deliver with a liftgate truck, usually for an added charge, and you will need a pallet jack to move a gaylord that can weigh up to about 1,600 lb.
Can I get a resin sample before ordering?
Often, yes. ResinBridge offers samples of about 50 lb upon credit approval, which is usually enough for a short molding trial.
How do I pay for a first resin order?
Many suppliers want payment up front on a first order. ResinBridge takes ACH, check or wire on first orders and offers Net 30 after credit approval.
Tell us what you need
A polymer chemist reviews every request, then matches your grade or finds a qualified equivalent and prices it.
What to send for an accurate quote
- The grade name, from any supplier, or a data sheet
- Color (natural, black or a custom match)
- Fill type and percentage, if any
- Melt flow, if you know it
- Quantity for this order and what you use in a year
- Ship-to city and state or province