Producer Price Index for unlaminated polyethylene film and sheet, a WPU commodity index for the converted packaging-grade product rather than the raw resin it is extruded from. Index base: December 2011 = 100.
Latest value
153.313
Index · as of Aug 2026
Year-over-year change
+18.4%
BLS
Month-over-month change
-1.5%
Latest value is 1 month old. Next update expected around Sep 2026.
Calculate your adjustment
Free, no account needed. Nothing you enter here leaves your browser.
Enter a base value, a current value, and a contract amount to see the adjustment.
Price history
Data & insights
Key figures
From Jan 2024 to Aug 2026 the index went from 125.0 to 153.3, a change of +22.7%.
Highest reading in that period: 157.8 in Jun 2026. Lowest: 125.0 in Jan 2024.
Largest one-month rise: +10.5% in Apr 2026. Largest one-month fall: -1.7% in Oct 2025.
For a clause that resets its base every year, a 10% cap or floor would have limited the adjustment in 5 of the last 20 months.
Volatility (12mo)
±3.73%
Std. dev. of month-over-month change
Strongest average month-over-month move historically: April (+3.3% avg).
What this means for your clause
Common in flexible packaging supply contracts, particularly for stretch wrap, produce bags, and industrial liner film. A buyer negotiating a pass-through clause should confirm whether the resin cost the supplier pays, or this finished-film index, is the one actually named in the agreement.
Draft a clause
A starting point citing this series by name and code. Replace the bracketed terms with your contract's actual scope before use.
The [affected portion] of the Contract Price shall be adjusted using US PPI — Unlaminated Polyethylene Film and Sheet (BLS series WPU072205011), published by BLS.
Base Period: the index value published for August 2026 (or the month of contract signing, if different) is the Base Value.
Adjustment: at each Adjustment Date, the Current Value is the most recently published three-month average of the index (the Averaging Window). The Escalation Factor equals Current Value divided by Base Value.
Cap: the Escalation Factor applied under this clause shall not exceed 1.10 or fall below 0.90 (a 10% cap and floor) in any single Adjustment Date, regardless of the index's actual movement.
[Replace bracketed terms with your contract's actual affected-portion definition and adjustment-date schedule before use. This is a drafting starting point, not legal advice.]
A plastics or resin PPI escalation clause compares a current-period Producer Price Index value for a named resin series to the value at contract signing (the base period), turns that into a ratio, then applies the ratio to the contract price or affected line items. BLS publishes separate series for thermoplastic resins, thermosetting resins, and finished plastic products, so naming the exact one matters more than usual here.
Escalake tracks US PPI — Unlaminated Polyethylene Film and Sheet, applies your formula, and gives both sides a number they can confirm, no spreadsheet required.
We use cookies to run Escalake and to understand site traffic. Choose Accept Minimum for essential cookies plus anonymous visit counting only, or Accept All to also let us link activity to your account. Read our Cookie Policy and Privacy Policy.