Valox 325: specs and equivalent grades
Unreinforced, general-purpose PBT injection molding grade sold under the Valox name, now from NexPoint Materials in the Americas and Europe. Published data, grades from other producers to ask about, and how to request a quote from one gaylord.
Request a QuoteThe short answer
Valox 325 is a general-purpose, unreinforced polybutylene terephthalate (PBT) for injection molding, with improved processing per SABIC’s data sheet. In the Americas and Europe, Valox is now sold by NexPoint Materials, the former SABIC engineering thermoplastics business that Mutares bought in a deal that closed August 3, 2026. SABIC’s Americas sheet lists specific gravity 1.31 (ASTM D792), tensile strength 51.7 MPa (7,500 psi) at yield (ASTM D638) and HDT 54.4°C / 130°F at 1.8 MPa (ASTM D648, 6.4 mm); SABIC’s international sheet gives MVR 14 cm³/10 min at 250°C / 482°F, 2.16 kg (ISO 1133). Grades from other producers to ask about include Ultradur B4520, Celanex 2002 and Crastin S600F10. They are not identical, so compare the data sheets and run a trial before switching.
Also written as: VALOX 325 resin. Data sheet hosts also list VALOX 325F and VALOX 325FC, which have their own data sheets. Quote the full code from your drawing or bag label; color and additive suffixes change the grade.
Buying Valox 325: 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.
Valox 325 specs from the data sheet
Typical values from SABIC’s Americas data sheet for Valox 325 (UL Yellow Card E121562-220785), as reproduced by a data sheet host, with melt flow from SABIC’s international sheet for the same grade. 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) | NexPoint Materials in the Americas and Europe (the former SABIC engineering thermoplastics business, owned by Mutares). Data sheets are still SABIC-branded. | NexPoint transition hub; SABIC data sheet |
| Polymer | PBT, unreinforced | |
| Process | Injection molding | |
| Specific gravity | 1.31 | ASTM D792 |
| Melt flow | Not on the Americas sheet. SABIC’s international sheet: MVR 14.0 cm³/10 min at 250°C / 482°F, 2.16 kg (ISO 1133); MFR 50 g/10 min at 265°C / 509°F, 5.0 kg (ASTM D1238) | International sheet, UL Yellow Card E45329-236588 |
| Tensile strength at yield | 51.7 MPa (7,500 psi) | ASTM D638, Type I, 50 mm/min |
| Tensile elongation at break | 200% | ASTM D638, Type I, 50 mm/min |
| Flexural modulus | 2,340 MPa (339,000 psi) | ASTM D790, 50 mm span |
| Flexural strength at yield | 82.7 MPa (12,000 psi) | ASTM D790, 50 mm span |
| Notched Izod impact | 53 J/m (1.0 ft-lb/in) at 23°C / 73°F | ASTM D256 |
| Unnotched Izod impact | 1,600 J/m at 23°C / 73°F | ASTM D4812 |
| HDT at 1.8 MPa (264 psi) | 54.4°C / 130°F | ASTM D648, 6.4 mm, unannealed |
| HDT at 0.45 MPa (66 psi) | 154°C / 309°F | ASTM D648, 6.4 mm, unannealed |
| Rockwell hardness | R117 | ASTM D785 |
| Molding shrinkage | In flow 0.9–1.6% (0.75–2.3 mm walls) and 1.5–2.3% (2.3–4.6 mm); across flow 1.0–1.7% and 1.6–2.4% | SABIC internal method |
| Water absorption | 0.08% (24 h); 0.34% at equilibrium, 23°C | ASTM D570 |
| Relative thermal index | 120°C / 248°F electrical and mechanical with impact; 140°C / 284°F mechanical without impact | UL 746 |
| Flame rating and outdoor use | HB at 0.838 mm; outdoor suitability f1 | UL 94; UL 746C |
| Drying | 121°C / 250°F for 3–4 h, 12 h maximum; 0.02% maximum moisture | Americas sheet, injection section |
| Melt temperature | 243–260°C / 469–500°F | Americas sheet, injection section |
| Mold temperature | 49–77°C / 120–170°F | Americas sheet (48.9–76.7°C) |
| Food contact | No food-contact statement on the Americas sheet | Ask for the producer’s regulatory letter |
Source data sheets are listed at the bottom of this page. Confirm against the current sheet for your exact grade code and color.
SABIC’s international sheet for the same grade gives drying at 110–120°C for 2–4 h, a 250–270°C melt and a 40–100°C mold. Follow the sheet for your supply region and the settings on your approved process.
Grades to ask about instead of Valox 325
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 Valox 325, any change needs your approval and usually a trial.
| Grade | Producer | Melt flow | Density | Key property | How it compares |
|---|---|---|---|---|---|
| Ultradur B4520 | BASF | MVR 20 cm³/10 min (250°C / 482°F, 2.16 kg, ISO 1133) | 1.30 g/cm³ (ISO 1183) | Yield stress 55 MPa (ISO 527); HDT 55°C at 1.8 MPa (ISO 75); notched Izod 50 J/m (ASTM D256) | Close match. Standard unreinforced PBT with similar strength, HDT and Izod and somewhat higher flow (MVR 20 vs 14 at the same condition). BASF lists a 40–70°C mold and drying at 80–120°C for 4 h to 0.04% moisture, looser than SABIC’s 0.02%. Quote this alternative › |
| Celanex 2002 | Celanese | MVR 18 cm³/10 min (250°C / 482°F, 2.16 kg, ISO 1133) | 1.31 g/cm³ (ASTM D792, ISO 1183) | Tensile strength at yield 55.8 MPa at 23°C (ASTM D638); HDT 55°C at 1.8 MPa; notched Charpy 6 kJ/m² (ISO 179/1eA) | Close match. Celanese calls it a general-purpose, medium-flow unreinforced PBT. Flow is close (MVR 18 vs 14). Celanese gives drying at 120–130°C for 4 h to 0.02% and a 65–93°C mold, hotter than SABIC’s range. Quote this alternative › |
| Crastin S600F10 NC010 | Celanese | MFR 10 g/10 min (250°C / 482°F, 2.16 kg, ISO 1133) | 1.30 g/cm³ (ISO 1183) | Yield stress 57 MPa (ISO 527); HDT 50°C at 1.8 MPa (ISO 75); contains mold release | Partial match. Higher-viscosity unreinforced PBT developed for extrusion and injection molding, so it fills thin walls less easily than Valox 325. The copy we found is a DuPont-era sheet; ask for the current Celanese sheet. Quote this alternative › |
From each producer’s published data. Brand owners and grade names change; confirm on the current data sheet.
Typical uses for Valox 325
From SABIC’s Valox 325 data sheet:
- Sprinklers and nozzles
- Pumps
- Door handles
- Tank covers
- Pens and pencils
What to check before you switch
- Confirm who supplies your Valox 325 now. In the Americas and Europe it comes from NexPoint Materials; older approvals, COAs and UL files may still say SABIC. Ask for the current data sheet with your quote.
- Check flow. Ultradur B4520 and Celanex 2002 flow somewhat more than Valox 325 at 250°C / 2.16 kg; Crastin S600F10 flows less. A big flow change can shift fill, pack and shrink.
- Unreinforced PBT shrinks about 1–2.4% on the Valox sheet, depending on wall and direction. Check critical dimensions on first articles.
- For outdoor parts, Valox 325 carries a UL 746C f1 rating on the Americas sheet. Confirm any alternative has its own.
- Moisture limits differ by sheet (0.02% for SABIC and Celanese, 0.04% for BASF). Dry to the stricter number if you run more than one grade.
- 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 Valox 325: 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 Valox 325 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 Valox 325 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
- SABIC VALOX 325 Americas data sheet, UL Yellow Card E121562 (PDF copy)
- SABIC VALOX 325 international data sheet, UL Yellow Card E45329 (PDF copy)
- NexPoint Materials transition hub
- BASF Ultradur B 4520 data sheet from Material Data Center (PDF)
- BASF Ultradur B 4520 processing data sheet, 09/2026 (PDF)
- Celanese Celanex 2002 data sheet (PDF copy)
- Crastin S600F10 NC010 data sheet, DuPont-era copy (PDF)
Common questions
What is Valox 325?
Valox 325 is a general-purpose, unreinforced PBT for injection molding. In the Americas and Europe it is now sold by NexPoint Materials, the former SABIC engineering thermoplastics business.
What is the melt flow of Valox 325?
SABIC’s Americas sheet does not list melt flow. Its international sheet for Valox 325 gives MVR 14.0 cm³/10 min at 250°C / 482°F, 2.16 kg (ISO 1133) and MFR 50 g/10 min at 265°C / 509°F, 5.0 kg (ASTM D1238).
What is equivalent to Valox 325?
Grades from other producers to ask about include Ultradur B4520, Celanex 2002 and Crastin S600F10. None is identical; compare data sheets and run a trial, and get approval if your part names Valox 325.
How do you dry Valox 325?
SABIC’s Americas data sheet gives 121°C / 250°F for 3–4 hours, 12 hours maximum, to 0.02% moisture or less.
Can ResinBridge supply Valox 325?
We quote Valox 325 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 Valox 325 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 Valox 325 or a matched alternative
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