The short answer
Resin prices start with feedstock costs (ethane or naphtha, propylene, benzene and their derivatives), then move with supply and demand, plant outages and producer increase announcements, only some of which stick. Large buyers pay contract prices, often tied to a published index; one-off lots trade on the spot market. Small buyers also pay for freight, packaging and handling, which is why a gaylord costs more per pound than a truckload. Compare quotes on the same basis: delivered or FOB, packaging, terms and quality tier.
This page explains the mechanics, not today's numbers. For what is moving this month, see the resin market notes.
Feedstocks: where the cost starts
Most resins trace back to oil or natural gas. In North America, most ethylene is cracked from ethane, a natural gas liquid; Europe and much of Asia crack naphtha, which is priced off crude oil. That difference is why North American polyethylene is usually cost-competitive globally, and why oil and gas prices pull different regions in different directions.
Engineering resins sit further down longer chains, and a single bottleneck can set the price. Nylon 66 is the classic case: it needs adipic acid and HMDA, HMDA is made from adiponitrile, and adiponitrile comes from only a few plants, so an outage at one of them can tighten PA66 worldwide.
| Resin | Main feedstock chain | What tends to move its price |
|---|---|---|
| Polyethylene (HDPE, LDPE, LLDPE) | Ethylene, mostly from ethane in North America and naphtha in Europe and Asia | Natural gas liquids, cracker outages, export demand |
| Polypropylene | Propylene from crackers, refineries and propane dehydrogenation | Propylene supply, refinery and PDH run rates |
| Polystyrene, HIPS | Styrene from benzene and ethylene | Benzene, styrene plant outages |
| ABS | Acrylonitrile (propylene and ammonia), butadiene, styrene | Butadiene is a by-product of naphtha cracking, so it swings with cracker feed |
| Polycarbonate | Bisphenol A (phenol and acetone, from benzene and propylene) | Phenol and acetone, BPA capacity, Asian supply |
| Acrylic (PMMA) | Methyl methacrylate, often from acetone | MMA supply and plant outages |
| Nylon 6 | Caprolactam, from benzene | Benzene, caprolactam capacity, much of it in Asia |
| Nylon 66 | Adipic acid plus HMDA; HMDA comes from adiponitrile, made by few plants | Adiponitrile capacity is the usual bottleneck |
| PET, PBT | PTA (paraxylene) plus ethylene glycol (PET) or butanediol (PBT) | Paraxylene, glycol and butanediol supply |
| Acetal (POM) | Formaldehyde from methanol | Methanol, a small number of producers |
| PVC | Ethylene plus chlorine from salt electrolysis | Caustic soda, the co-product of chlorine, affects PVC economics |
| PPS, PEEK and other specialty resins | Specialty monomers, few producers | Producer pricing policy more than feedstock |
Simplified chains; producers use different routes, and regional supply often matters more than feedstock in a given month.
Announced increases vs. what settles
Producers announce increases (or, less often, decreases) by letter, by an amount per pound and from an effective date. An announcement is an opening position. Whether it settles in full, in part or not at all depends on supply, demand and feedstock that month, and trade publications report what they see implemented. Buyers often see several announcements in a row, with only part of each sticking.
Contract, index and spot
- Contract pricing covers ongoing volume and is often reset monthly. Many contracts are tied to a published market index: the contract price moves with the index, plus or minus a negotiated differential.
- Indexes are published by trade publications and price reporting services, from surveys of producers and buyers. They are useful for direction and for contract formulas; small-lot buyers rarely pay index prices directly.
- Spot pricing applies to one-off lots, usually truckloads or railcars of prime, wide-spec or surplus. It moves faster than contract in both directions and is where a loose or tight market shows first.
Freight, packaging and order size
Bulk railcar and bulk truck are the cheapest way to move resin per pound. Boxed (gaylord) and bagged resin carry packaging and handling costs, and a single gaylord moves less-than-truckload, so freight per pound is several times a full truck's. Add fuel surcharges, liftgate or residential delivery, and the seller's cost of holding inventory and paperwork for small lots, and a gaylord costs noticeably more per pound than a truckload of the same grade. In exchange you tie up far less cash and floor space. See gaylord vs. LTL vs. truckload and small-quantity resin.
Why recycled can cost more than virgin
Post-consumer resin has to be collected, sorted, washed, melt-filtered, re-pelletized and tested, and those costs fall much less than oil and gas do. Most food-contact PCR comes from recycling processes that have received an FDA no-objection letter, which limits supply. Brand commitments and state recycled-content laws keep demand for clean, consistent PCR firm. So when virgin prices drop, good PCR can end up priced above virgin. See recycled resins.
Seasons, storms and force majeure
Much of North America's polyethylene, polypropylene and PVC capacity is on the U.S. Gulf Coast. The Atlantic hurricane season runs June 1 to November 30, and a storm that shuts plants or ports can bring force majeure declarations and quick increases. Freezes do it too: Winter Storm Uri in February 2021 shut many Gulf Coast plants. Planned maintenance turnarounds tighten supply for weeks at a time, and year-end inventory cutting by buyers often softens demand in December. See allocation and force majeure.
How to read a price increase letter
- Which grades or families? A family-wide letter may not apply to your grade in full.
- How much, and is it "up to"? An "up to" amount leaves room to negotiate.
- Effective date, and on orders or shipments? Orders already placed may ship at the old price.
- Contract or off-list? Index-based contracts may move only with the index.
- The stated reason. Feedstock, outages or demand; check it against the market notes.
Then get a second quote on the same grade. What to do when your supplier raises the price walks through the steps.
How to compare quotes
- Delivered vs. FOB: an FOB price excludes freight; add it before comparing.
- Packaging: bags, gaylords and bulk differ in cost and handling.
- Quantity: make sure both quotes are for the same volume.
- Payment terms: prepayment and Net 30 have different cash costs.
- Validity and lead time: a price you cannot get on time is not a price.
- Quality tier: prime with a lot COA vs. wide-spec or surplus. See prime vs. off-grade.
- Imports: ask whether duties and tariffs are included; they change.
A price far below every other quote is a warning sign; see how to vet a resin supplier.
How we can help
Send the grade, quantity and ship-to city, or a quote you want to compare. A polymer chemist reviews every request. Our standard terms are FOB the warehouse, orders start at one gaylord, every lot ships with a COA, and we aim to send your quote within one to three business days.
Common questions
What drives plastic resin prices?
Feedstock costs (ethane, naphtha, propylene, benzene and their derivatives), supply and demand, plant outages and maintenance, freight, and the producer's announced increases or decreases. For small buyers, packaging, freight and order size often matter as much as the resin itself.
Why are resin price increases not always passed through in full?
Producers announce increases to test the market. Whether they stick depends on supply, demand and feedstock costs that month, so trade press often reports only part of an announcement as settled, or none of it.
What is the difference between contract and spot resin prices?
Contract prices are agreed for ongoing volume, often reset monthly and often tied to a published index plus or minus a negotiated differential. Spot prices are for one-off lots, usually truckloads or railcars, and move faster in both directions.
Why does a gaylord cost more per pound than a truckload?
Freight per pound is much higher on a single LTL pallet, packaging adds cost, and the seller spreads handling, inventory and paperwork over far fewer pounds. You pay more per pound but tie up far less cash.
Why can recycled resin cost more than virgin?
Collecting, sorting, washing, re-pelletizing and testing PCR costs about the same whether oil and gas are cheap or expensive. When feedstocks are cheap, virgin prices fall but PCR costs usually fall much less, and demand from recycled-content commitments and laws keeps good PCR in demand.
How should I compare two resin quotes?
Line them up on the same basis: delivered or FOB, packaging, quantity, payment terms, quote validity, lead time, and quality tier with a lot COA. A lower resin price can land at a higher delivered cost.
Do hurricanes affect resin prices?
They can. Much of North America's polyethylene, polypropylene and PVC capacity sits on the U.S. Gulf Coast, so a storm that shuts plants, or a hard freeze like Winter Storm Uri in February 2021, can trigger force majeure declarations and tighter supply.
Tell us the grade you buy
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