Pro-fax SR257M: specs and equivalent grades
LyondellBasell clarified polypropylene random copolymer with antistat, for blow molded bottles, clear containers, film and sheet. Published data, grades from other producers to ask about, and how to request a quote from one gaylord.
Request a QuoteThe short answer
Pro-fax SR257M is LyondellBasell's clarified polypropylene random copolymer with antistat, sold in pellet form for blow molding and extrusion where see-through and contact clarity matter. It is available in North America. Published melt flow is 2.0 g/10 min, measured at 230°C / 446°F, 2.16 kg, ASTM D1238, and density is 0.90 g/cm³ (ASTM D792). Grades from other producers to ask about include TotalEnergies Polypropylene 7238, Exceed PP9122 (ExxonMobil) and Formolene 3302B. They are not identical, so compare the data sheets and run a trial before switching.
Buying Pro-fax SR257M: one gaylord to a railcar · supplier COA on every prime lot · ships from 22+ partner warehouse locations · a polymer chemist checks the grade code before we quote · we aim to quote within one to three business days
Have a part number or drawing callout?
Paste it as written. A polymer chemist will tell you which grade it calls for, suggest equivalents and quote it by email.
Pro-fax SR257M specs from the data sheet
Typical values from LyondellBasell's published data sheet. Typical values are not specifications; the lot COA shows what you actually receive. Values only compare at the same test method and condition.
| Property | Value | Test method or note |
|---|---|---|
| Producer (brand owner) | LyondellBasell | Data sheet |
| Polymer | Clarified polypropylene random copolymer, contains antistat | |
| Process | Extrusion blow molding, injection blow molding, blown film, sheet and thermoforming | |
| Availability | North America (status: commercial, active) | Data sheet |
| Melt flow | 2.0 g/10 min | 230°C / 446°F, 2.16 kg, ASTM D1238 |
| Density | 0.90 g/cm³ (ASTM D792) | |
| Flexural modulus, 1% secant | 965 MPa (140,000 psi) | ASTM D790, Procedure A, 1.3 mm/min (0.05 in/min) |
| Tensile strength at yield | 30 MPa (4,300 psi) | ASTM D638, 50 mm/min (2 in/min) |
| Tensile elongation at yield | 14 % | ASTM D638 |
| Notched Izod impact, 23°C / 73°F | 370 J/m (7.0 ft-lb/in) | ASTM D256, Method A |
| HDT 0.45 MPa (66 psi), unannealed | 74°C / 165°F | ASTM D648 |
| Haze, 45 mil | 9 % | ASTM D1003 |
| Additives | Clarified; contains antistat (data sheet attributes: contains antistat, high clarity, random copolymer) | |
| Food contact | The data sheet makes no food-contact statement; it refers to LyondellBasell's Product Stewardship Bulletin (PSB), a separate document from LyondellBasell. LyondellBasell lists food packaging film and clear containers among its applications. Ask for the PSB or a regulatory letter for your use. | |
| Melt temperature range | Not published on the data sheet | LyondellBasell TDS (publication date 10/31/2026): 'Specific recommendations for resin type and processing conditions can only be made when the end use, required properties and fabrication equipment are known.' |
| Mold temperature range | Not published on the data sheet | LyondellBasell TDS |
| Drying | No drying step on the data sheet. LyondellBasell's polyolefin film extrusion guide (linked from the product page) says polyolefins are non-hygroscopic and do not need drying before extrusion | LyondellBasell 'A Guide to Polyolefin Film Extrusion' |
| Form and packaging | Pellets. Package sizes not published | LyondellBasell TDS product description ('available in pellet form') |
Source data sheets are listed at the bottom of this page. Confirm against the current sheet for your exact grade code and color.
LyondellBasell's polyolefin film extrusion guide, linked from this grade's product page, says polyolefins are non-hygroscopic and do not need drying before extrusion; the grade's own data sheet gives no drying or temperature settings.
Grades to ask about instead of Pro-fax SR257M
These grades from other producers have similar published specs. None is a drop-in replacement: additive packages, flow at molding shear rates, color and approvals differ. If your part, drawing or customer approval names Pro-fax SR257M, any change needs your approval and usually a trial.
| Grade | Producer | Melt flow | Density | Key property | How it compares |
|---|---|---|---|---|---|
| TotalEnergies Polypropylene 7238 | TotalEnergies (produced in the United States) | 2 g/10 min (ASTM D1238, Condition L: 230°C, 2.16 kg) | 0.900 g/cm³ (ASTM D1505) | Flexural modulus 827 MPa (120,000 psi) (ASTM D790); notched Izod 69 J/m (1.3 ft-lb/in) (ASTM D256A) | Partial match. Random copolymer for blow molding with impact strength, clarity and gloss, lubricated for core rod release. Same MFR. TotalEnergies states it has passed USP Class VI testing and complies with applicable FDA food contact regulations. The sheet does not say clarified or antistatic, and notched Izod is far below SR257M. Quote this alternative › |
| Exceed PP9122 | ExxonMobil | 2.1 g/10 min (230°C / 446°F, 2.16 kg, ASTM D1238) | 0.900 g/cm³ (ExxonMobil method) | Flexural modulus, 1% secant 972 MPa (141,000 psi) (ASTM D790A); notched Izod 68 J/m (ASTM D256A) | Partial match. Random copolymer for extrusion and injection blow molding, sheet and thermoforming, with low extractables and low odor; North America. Same stiffness as SR257M, but the sheet does not describe it as clarified or antistatic, and notched Izod is far lower. ExxonMobil asks buyers to contact it for food-contact compliance. Quote this alternative › |
| Formolene 3302B | Formosa Plastics USA | 2.3 g/10 min (230°C / 446°F, ASTM D1238) | 0.9 g/cm³ (ASTM D1505) | Flexural modulus, 1% secant 1,100 MPa (160,000 psi) (ASTM D790); notched Izod 160 J/m (3.0 ft-lb/in) (ASTM D256A) | Partial match. Low melt flow random copolymer for extrusion and thermoforming, made with an advanced nucleator for neutral color and low haze (24% plaque haze, Formosa method). MFR about 15% higher. Formosa states it meets FDA 21 CFR 177.1520. No antistat stated, and blow molding is not listed. Quote this alternative › |
From each producer's published data. Brand owners and grade names change; confirm on the current data sheet.
No new alternative added. No producer sheet opened in this pass shows a clarified random copolymer near 2 MFR with antistat and an Izod near 370 J/m. Checked: Formosa random copolymers (3310Z, 3312B, 3335E, 3355E, 3435E, 3507Z: 7 to 55 MFR, Izod 53 to 107 J/m) and TotalEnergies 7425 (4 MFR, Izod 69 J/m, made to order). Braskem's sheets need a Knowde account (not created). Suggested page line: 'We found no published grade that matches SR257M on clarity, antistat and impact together. Tell us which of the three matters most and we will match to that.'
Typical uses for Pro-fax SR257M
From LyondellBasell's data sheet:
- Bottles for consumer goods
- Clear containers
- Food packaging film
- Specialty film
- Sheet and thermoformed packaging
What to check before you switch
- SR257M is both clarified and antistatic. None of the grades above states both, so check haze and dust pickup on a trial run.
- Impact gap: SR257M lists 370 J/m notched Izod, versus 69 J/m (7238), 68 J/m (Exceed PP9122) and 160 J/m (Formolene 3302B). Re-run drop tests on bottles and containers.
- Haze values are not comparable: LyondellBasell reports 9% at 45 mil (ASTM D1003); Formosa reports 24% plaque haze by its own method.
- ExxonMobil's current sheet names the grade Exceed PP9122. If your paperwork says ExxonMobil PP9122, confirm with ExxonMobil that it is the same grade.
- LyondellBasell keeps regulatory details in its Product Stewardship Bulletin, a separate document from the data sheet. Ask for the PSB or a letter for food or consumer packaging.
- Compare melt flow, density and impact only at the same test condition and method (ASTM vs. ISO results differ).
- Ask for the producer's food-contact or regulatory letter for the exact grade if the part needs one.
- Run a trial lot and check shrinkage, cycle time and appearance before you switch production.
Buying Pro-fax SR257M: price, lead time and lot size
- Lot size. From one gaylord to a railcar. See gaylord, LTL and truckload for typical weights per box.
- Where it ships from. 22+ partner warehouse locations. Material already in a partner warehouse usually moves sooner than a grade that has to come from the producer; your quote says which applies.
- Price. We do not publish prices because they move with feedstock, freight and order size. What moves your price most: lot size, color, ship-to region, and whether you need Pro-fax SR257M itself or can accept a matched alternative. See how resin is priced and the monthly market update.
- Paperwork. Supplier COA on every prime lot (what a COA shows). Ask for the producer’s regulatory letter or UL file if your part needs them.
- Trying an alternative? Start with one gaylord as a trial lot, molded and checked before you commit a full release.
- If Pro-fax SR257M itself is not available. Some branded grades are sold only through the producer’s own channels or go on allocation. If we cannot source it, we tell you, then quote a matched alternative with a side-by-side comparison.
Send the grade code, your annual volume and ship-to location. A polymer chemist checks it before we quote; we have been in the resin business for 30+ years. For several grades at once, use the resin RFQ template.
Trade names belong to their owners. ResinBridge is not affiliated with these producers; grade names are used only to identify the material. Data reflects published sheets as of October 2026.
Sources
- LyondellBasell Pro-fax SR257M product page
- LyondellBasell Pro-fax SR257M technical data sheet (PDF)
- TotalEnergies Polypropylene 7238 data sheet (PDF)
- ExxonMobil Exceed PP9122 data sheet (PDF)
- Formosa Formolene 3302B data sheet (PDF)
- LyondellBasell: A Guide to Polyolefin Film Extrusion (PDF)
- Formosa Plastics product page
- TotalEnergies published data sheet (PDF)
Common questions
What is Pro-fax SR257M?
Pro-fax SR257M is LyondellBasell's clarified polypropylene random copolymer with antistat, sold in pellet form for blow molding and extrusion where see-through and contact clarity matter. It is available in North America.
What is the melt flow of Pro-fax SR257M?
2.0 g/10 min, measured at 230°C / 446°F, 2.16 kg, ASTM D1238, per the published data sheet.
What is equivalent to Pro-fax SR257M?
Grades from other producers to ask about include TotalEnergies Polypropylene 7238, Exceed PP9122 (ExxonMobil) and Formolene 3302B. None is identical; compare data sheets and run a trial, and get approval if your part names Pro-fax SR257M.
Is Pro-fax SR257M food-contact compliant?
The data sheet makes no food-contact statement; it refers to LyondellBasell's Product Stewardship Bulletin (PSB), a separate document from LyondellBasell. LyondellBasell lists food packaging film and clear containers among its applications. Ask for the PSB or a regulatory letter for your use.
Can ResinBridge quote Pro-fax SR257M?
Yes. Send the grade name and volume. A polymer chemist checks it and we quote the grade where we can source it, or a matched alternative, and say which one. Orders start at one gaylord; U.S. and Canada only.
If your grade is not listed, tell us what you run. We source commodity, engineering and specialty resins.
Need Pro-fax SR257M or an equivalent?
A polymer chemist reviews every request, then matches your grade or finds a matched alternative 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
Quote Pro-fax SR257M or a matched alternative
A polymer chemist checks the data sheet and tells you exactly what you would get before you order.
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