NORYL 731: specs and equivalent grades
NORYL 731 is a PPE/PS blend from SABIC. Published specs, grades from other producers to ask about, and how to buy it from one gaylord to a railcar.
Updated October 28, 2026
Request a QuoteThe short answer
NORYL 731 is a unreinforced blend of polyphenylene ether (PPE) and polystyrene (PS), non flame retardant (UL 94 HB), from SABIC. The data sheet lists melt flow rate as 9.2 g/10 min at 280 °C (536 °F), 5.0 kg (11.0 lb) load (ASTM D1238). Specific gravity / density: 1.06 (1.06 g/cm³, about 0.0383 lb/in³). Grades from other producers to ask about include XYRON 400H and XYRON 300H. They are not identical, so compare the data sheets and run a trial before switching.
Buying NORYL 731: from one gaylord to a railcar · supplier COA on every prime lot · NORYL 731 or a qualified equivalent, named on your quote · a polymer chemist reviews every request · 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.
NORYL 731 specs from the data sheet
Typical values from the producer’s published data sheet (NORYL 731 (SABIC Americas data sheet, revision dated November 9, 2023 on sabic.com)). 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) | SABIC (NORYL is listed under SABIC Specialties; it is not named among the brands in the 2026 sale of SABIC's Americas and Europe engineering thermoplastics business to Mutares) | Data sheet |
| Polymer | Unreinforced blend of polyphenylene ether (PPE) and polystyrene (PS), non flame retardant (UL 94 HB) | |
| Process | Injection molding | |
| Melt flow rate | 9.2 g/10 min at 280 °C (536 °F), 5.0 kg (11.0 lb) load | ASTM D1238 |
| Specific gravity / density | 1.06 (1.06 g/cm³, about 0.0383 lb/in³) | ASTM D792 / ISO 1183 |
| Hardness | Rockwell R 119 | ASTM D785 |
| Tensile strength at yield | 58 MPa (about 8,410 psi), Type I, 50 mm/min | ASTM D638 |
| Tensile strength at break | 49 MPa (about 7,110 psi), Type I, 50 mm/min | ASTM D638 |
| Elongation at break | 28.1% | ASTM D638 |
| Flexural modulus | 2,640 MPa (about 383,000 psi), 50 mm span | ASTM D790 |
| Notched Izod impact | 213 J/m (about 4.0 ft-lb/in) at 23 °C (73 °F); 133 J/m (about 2.5 ft-lb/in) at -40 °C (-40 °F) | ASTM D256 |
| HDT at 1.82 MPa (264 psi), unannealed | 117 °C (about 243 °F) at 3.2 mm; 126 °C (about 259 °F) at 6.4 mm | ASTM D648 |
| HDT at 0.45 MPa (66 psi), unannealed, 3.2 mm | 131 °C (about 268 °F) | ASTM D648 |
| Vicat softening point, Rate B/50 | 148 °C (about 298 °F) | ASTM D1525 |
| UL 94 flame rating | HB at 1.5 mm (0.059 in) and thicker; UL Yellow Card E121562-221150 | UL 94 |
Source data sheets are listed at the bottom of this page. Confirm against the current sheet for your exact grade code and color.
Grades to ask about instead of NORYL 731
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 NORYL 731, any change needs your approval and usually a trial.
| Grade | Producer | Melt flow | Density | Key property | How it compares |
|---|---|---|---|---|---|
| XYRON 400H | Asahi Kasei | Not published | 1.06 g/cm³ (ISO 1183) | HDT at 1.8 MPa, unannealed: 110 °C (230 °F) by ASTM D648 and 104 °C (219 °F) by ISO 75-2/A; flexural modulus 2,370 MPa (about 344,000 psi) by ISO 178; Charpy notched 18 kJ/m²; UL 94 HB at 1.5 mm | Same type of material (unreinforced, non flame retardant modified PPE/PS) and the same density as NORYL 731. Its ASTM HDT is a few degrees lower than 731's 117 °C at 3.2 mm (the 400H sheet does not state bar thickness), and its ISO flexural modulus is a little lower than 731's 2,550 MPa. No melt flow is listed, so flow cannot be compared. Values come from a distributor-hosted copy of the data sheet, so confirm them with Asahi Kasei. This is not a drop-in replacement. |
| XYRON 300H | Asahi Kasei | Not published (sheet describes it as easy flow) | 1.06 g/cm³ (ISO 1183) | HDT at 1.8 MPa, unannealed: 100 °C (212 °F) by ASTM D648 and 94 °C (201 °F) by ISO 75-2/A; flexural modulus 2,320 MPa (about 336,000 psi) by ISO 178; Charpy notched 19 kJ/m²; UL 94 HB at 1.5 mm | Also an unreinforced, non flame retardant PPE/PS at the same density, but with clearly lower heat resistance than NORYL 731 (100 °C vs 117 °C on ASTM D648) and slightly lower stiffness. Only consider it where the part's heat needs allow. Values come from a distributor-hosted copy of the data sheet, so confirm them with Asahi Kasei. This is not a drop-in replacement. |
From each producer’s published data. Brand owners and grade names change; confirm on the current data sheet.
Typical uses for NORYL 731
SABIC describes NORYL 731 as an injection moldable grade with good surface appearance, high ductility, good impact resistance, low moisture absorption, creep resistance, dimensional stability and hydrolytic stability, and calls it an excellent candidate for a variety of applications. The sheet does not name specific end uses.
What to check before you switch
- Compare full data sheets side by side, including test method, bar thickness and test conditions, not just headline numbers.
- If the part carries a UL listing, confirm the substitute's UL Yellow Card covers your thickness, color and rating.
- Check chemical exposure in the end use, since PPE/PS blends can be sensitive to some solvents and oils.
- Run molding trials and check shrinkage, fit, warp and surface appearance before releasing production.
- Check whether a customer or OEM specification names NORYL 731; a substitute usually needs formal approval.
Buying NORYL 731 or an equivalent
Send us the grade name, your annual volume and ship-to location. A polymer chemist checks the data sheet and we quote NORYL 731 where we can source it, or a qualified equivalent, saying clearly which one you would get. Orders start at one gaylord. For background on this resin family see PPO/PPE grades and buying guide; 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
- SABIC NORYL Resin grade list, NORYL 731 technical data (Americas, revision dated November 9, 2023)
- XYRON 400H data sheet (distributor-hosted copy of Asahi Kasei data)
- XYRON 300H data sheet (distributor-hosted copy of Asahi Kasei data)
- Mutares: completion of SABIC Americas and Europe engineering thermoplastics acquisition (brands named: LEXAN, CYCOLOY, VALOX, CYCOLAC)
Common questions
What is NORYL 731?
NORYL 731 is a SABIC unreinforced blend of polyphenylene ether (PPE) and polystyrene (PS) for injection molding. SABIC describes it as having good surface appearance, high ductility, good impact resistance, low moisture absorption, creep resistance, dimensional stability and hydrolytic stability.
What is the melt flow of NORYL 731?
SABIC's Americas data sheet lists a melt flow rate of 9.2 g/10 min at 280 °C (536 °F) with a 5.0 kg load (ASTM D1238), and a melt volume rate of 9 cm³/10 min at the same conditions (ISO 1133).
What is equivalent to NORYL 731?
There is no exact equivalent. Asahi Kasei XYRON 400H and XYRON 300H are also unreinforced, non flame retardant PPE/PS grades with the same 1.06 g/cm³ density, but their heat deflection and stiffness values differ and the sheets we found do not list melt flow. Any switch needs testing and, where required, customer approval.
Is NORYL 731 UL listed or food contact compliant?
The sheet lists UL 94 HB at 1.5 mm and thicker under UL Yellow Card E121562-221150, with UL 746B relative thermal indices of 105 °C electrical, 90 °C mechanical with impact and 105 °C mechanical without impact. The NORYL 731 sheet does not state food contact or potable water compliance. SABIC makes those claims for the related grades 731F and 731S, so check their sheets if you need them.
Can ResinBridge quote NORYL 731?
Yes. Send the grade name and volume. A polymer chemist checks it and we quote the grade where we can source it, or a qualified equivalent, and say which. Orders start at one gaylord; U.S. and Canada only.
Need NORYL 731 or an equivalent?
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
Quote NORYL 731 or a qualified equivalent
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. A polymer chemist reviews every request.