Pro-fax SV258: specs and equivalent grades
LyondellBasell fractional melt flow polypropylene impact copolymer (1.2 MFR) for sheet, profile and blow molding, sold in North America. 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 SV258 is a LyondellBasell impact polypropylene copolymer in pellet form, typically used in extrusion and described as having very good cold temperature impact resistance. Published melt flow rate is 1.2 g/10 min at 230°C / 2.16 kg (ASTM D1238), density is 0.90 g/cm³ (ASTM D792) and notched Izod is 208 J/m (3.9 ft-lb/in) at 23°C, per LyondellBasell's product page and data sheet. Grades from other producers to ask about include Formolene 6502O, TotalEnergies Polypropylene 4170 and Formolene 6501A. They are not identical, so compare the data sheets and run a trial before switching.
Also written as: Profax SV258, SV258. LyondellBasell's data sheet lists no color or additive suffixes for this grade. Quote the full code from your drawing or bag label.
Buying Pro-fax SV258: 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 SV258 specs from the data sheet
Typical values from LyondellBasell's Pro-fax SV258 product page and its technical data sheet dated 10/20/2022. Typical values are not specification limits; 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 | Product page (2026) and data sheet dated 10/20/2022 |
| Polymer | Polypropylene, impact copolymer | |
| Processing methods | Compounding; extrusion blow molding; sheet; sheet and profile extrusion; thermoforming | Data sheet |
| Availability | North America | Product page and data sheet |
| Status and form | Commercial: Active; pellets | Data sheet |
| Melt flow | 1.2 g/10 min | 230°C / 446°F, 2.16 kg, ASTM D1238 |
| Density | 0.90 g/cm³ | 23°C, ASTM D792 |
| Flexural modulus, 1% secant | 180,000 psi (1,240 MPa) | ASTM D790, Procedure A, 0.05 in/min (1.3 mm/min) |
| Tensile strength at yield | 4,100 psi (28 MPa) | ASTM D638, 2 in/min (50 mm/min) |
| Tensile elongation at yield | 11 % | ASTM D638 |
| Notched Izod impact at 73°F / 23°C | 3.9 ft-lb/in (208 J/m) | ASTM D256, Method A |
| Deflection temperature at 66 psi (0.45 MPa), unannealed | 180°F (82°C) | ASTM D648 |
| Attributes | Good dimensional stability, good stiffness, low temperature impact resistance | Data sheet |
| Food contact | Not stated on the data sheet. LyondellBasell refers to the Pro-fax SV258 Product Stewardship Bulletin (PSB) and SDS for regulatory status. | Data sheet |
| Drying | Not published on the data sheet | Data sheet |
| Melt temperature | Not published on the data sheet. LyondellBasell says specific processing recommendations depend on end use, required properties and equipment. | Data sheet |
Source data sheets are listed at the bottom of this page. Confirm against the current sheet for your exact grade code and color.
The producer's sheet gives no drying step; polypropylene does not normally need drying, but material moved from a cold warehouse into a warm plant can pick up surface condensation, so let it reach room temperature in the closed box before opening.
Grades to ask about instead of Pro-fax SV258
These grades from other producers have similar published specs. None is a drop-in replacement: additive packages, flow at processing shear rates, color and approvals differ. If your part, drawing or customer approval names Pro-fax SV258, any change needs your approval and usually a trial.
| Grade | Producer | Melt flow | Density | Key property | How it compares |
|---|---|---|---|---|---|
| Formolene 6502O | Formosa Plastics USA | 1.5 g/10 min (230°C / 446°F, I2, ASTM D1238) | 0.9 g/cm³ (ASTM D1505) | Flexural modulus, 1% secant 1,207 MPa (175,000 psi) (ASTM D790); notched Izod no break at 73°F and 91 J/m (1.7 ft-lb/in) at 32°F (ASTM D256A); HDT at 66 psi 100°C (212°F) | Close match on use. High impact copolymer for blow molded bottles, heavy gauge thermoforming sheet and profile extrusion including corrugated board, designed for long-term heat aging. MFR 1.5 vs 1.2; similar stiffness. The sheet (published 11/24) makes no food-contact statement. Quote this alternative › |
| TotalEnergies Polypropylene 4170 | TotalEnergies (produced in the United States) | 0.8 g/10 min (230°C / 2.16 kg; ASTM D1238) | 0.905 g/cm³ (ASTM D1505) | Flexural modulus 1,140 MPa (165,000 psi) (ASTM D790); notched Izod no break at 23°C and 80 J/m (1.5 ft-lb/in) at -20°C (ASTM D256); HDT 90°C (194°F) | Partial match. Low melt flow impact copolymer with melt strength, for profile and sheet extrusion, extrusion-thermoforming, blown film and corrugated board. Stiffer flow (0.8 vs 1.2) and a softer part on paper; check sheet sag and draw-down on your line. The sheet makes no food-contact statement. Quote this alternative › |
| Formolene 6501A | Formosa Plastics USA | 0.7 g/10 min (230°C / 446°F, I2, ASTM D1238) | 0.9 g/cm³ (ASTM D1505) | Flexural modulus, 1% secant 1,207 MPa (175,000 psi) (ASTM D790); notched Izod 907 J/m (17 ft-lb/in) at 73°F and 342 J/m (6.4 ft-lb/in) at 0°F (ASTM D256A); HDT at 66 psi 95°C (203°F) | Partial match. Fractional melt flow, high impact copolymer that Formosa positions for compounding and extrusion. Lower MFR than SV258 (0.7 vs 1.2), similar stiffness, much higher Izod on paper and HDT 13°C higher. Formosa states it meets FDA 21 CFR 177.1520. Quote this alternative › |
From each producer's published data. Brand owners and grade names change; confirm on the current data sheet.
Typical uses for Pro-fax SV258
From LyondellBasell's Pro-fax SV258 data sheet:
- Automotive parts
- Corrugated sheet
- Opaque containers
- Rigid packaging (market)
- Sheet and profile extrusion, extrusion blow molding and thermoforming (processes)
What to check before you switch
- Fractional melt flow grades are chosen for melt strength. A shift from 1.2 to 0.8 or 1.5 g/10 min changes sag, draw-down and die swell, so trial on your own line.
- SV258 shows a notched Izod of 208 J/m at 23°C. Formolene 6502O and TotalEnergies 4170 show no break at room temperature, but cold temperature values are measured at different temperatures, so compare at your service temperature.
- Check stiffness if the part carries load: 4170 is softer on paper (165,000 psi vs 180,000 psi).
- Only the Formolene 6501A sheet states food-contact status (FDA 21 CFR 177.1520). For SV258, 6502O and 4170, ask for the producer's regulatory letter if the part needs one.
- Compare melt flow, density and impact only at the same test condition and method (ASTM vs. ISO results differ).
- Run a trial lot and check gauge control, surface and impact before you switch production.
Buying Pro-fax SV258: 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 SV258 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 SV258 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 SV258 product page
- LyondellBasell Pro-fax SV258 technical data sheet, 10/20/2022 (hosted copy, PDF)
- Formosa Formolene 6502O data sheet (PDF)
- TotalEnergies Polypropylene 4170 data sheet (PDF)
- TotalEnergies Polypropylene 4170 product page
- Formosa Formolene 6501A data sheet (PDF)
Common questions
What is Pro-fax SV258?
Pro-fax SV258 is a LyondellBasell impact polypropylene copolymer in pellet form, typically used in extrusion (sheet, profile, extrusion blow molding, thermoforming) and described as having very good cold temperature impact resistance. It is sold in North America.
What is the melt flow of Pro-fax SV258?
1.2 g/10 min, measured at 230°C / 2.16 kg, ASTM D1238, per LyondellBasell's product page and data sheet.
What is equivalent to Pro-fax SV258?
Grades from other producers to ask about include Formolene 6502O, TotalEnergies Polypropylene 4170 and Formolene 6501A. None is identical; compare data sheets and run a trial, and get approval if your part names Pro-fax SV258.
Is Pro-fax SV258 food-contact compliant?
The data sheet does not say. LyondellBasell refers to the Pro-fax SV258 Product Stewardship Bulletin and SDS for regulatory status; ask for them for your exact use.
Can ResinBridge supply Pro-fax SV258?
We quote Pro-fax SV258 when our supply partners can source it. If they cannot, we say so up front and quote a matched alternative, named on the quote with its data sheet, so you can decide whether to trial it.
If your grade is not listed, tell us what you run. We source commodity, engineering and specialty resins.
Need Pro-fax SV258 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 SV258 or a matched alternative
A polymer chemist checks the data sheet and tells you exactly what you would get before you order.
Request a QuoteNot sure which grade fits your part?
Send the grade you run now, or describe the part.