Zytel ST801: specs and equivalent grades
Celanese unreinforced, super-toughened polyamide 66 (nylon 66) for injection molding. Published data, grades from other producers to ask about, and how to request a quote from one gaylord.
Request a QuoteThe short answer
Zytel ST801 NC010 is Celanese's unreinforced, super-toughened polyamide 66 (PA66-HI), sold for injection molding where impact resistance matters most. No melt flow rate is published on the current sheet. Density is 1.08 g/cm³ (ISO 1183), and notched Charpy impact at 23°C is 80 kJ/m² dry and 115 kJ/m² conditioned (ISO 179/1eA). Grades from other producers to ask about include Vydyne 41 NT, Ultramid A3Z and Vydyne 47 NT. They are not identical, so compare the data sheets and run a trial before switching.
Also written as: Zytel ST801 NC010, Zytel ST801 BK010. Quote the full code from your drawing or bag label; color and additive suffixes change the grade.
Buying Zytel ST801: 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.
Zytel ST801 specs from the data sheet
Typical values from Celanese's published data sheet (revised August 2024). Dry / conditioned values are shown where the sheet gives both. 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) | Celanese | Zytel was a DuPont product line, acquired by Celanese in 2022; current Zytel data sheets come from the Celanese materials database |
| Polymer | Polyamide 66, unreinforced, super toughened (PA66-HI) | ISO 1043 |
| Process | Injection molding | |
| Melt flow / viscosity | Not published on the current sheet | |
| Density | 1.08 g/cm³ (1,080 kg/m³, ISO 1183) | |
| Tensile modulus, dry / conditioned | 2,000 / 900 MPa (290,000 / 131,000 psi) | ISO 527 |
| Yield stress, dry / conditioned | 50 / 43 MPa (7,250 / 6,240 psi) | ISO 527 |
| Nominal strain at break, dry / conditioned | 40 / >50 % | ISO 527 |
| Flexural modulus, dry / conditioned | 1,800 / 700 MPa (261,000 / 102,000 psi) | ISO 178 |
| Notched Charpy impact, 23°C / -30°C, dry | 80 / 18 kJ/m² (115 / 17 conditioned) | ISO 179/1eA |
| Notched Izod impact, 23°C / -30°C, dry | 80 / 20 kJ/m² (90 / 20 conditioned) | ISO 180/1A |
| HDT 1.8 MPa / 0.45 MPa (dry) | 64°C / 147°F (71°C annealed); 132°C / 270°F | ISO 75 |
| Melting temperature | 263°C / 505°F | ISO 11357 |
| Mold shrinkage, parallel / normal | 1.8 % / 1.4 % | ISO 294-4 |
| Water absorption, 2 mm: saturation / humidity | 6.5 % / 2 % | Similar to ISO 62 |
| Flammability | HB at 0.81 mm and 1.5 mm (UL recognized) | IEC 60695-11-10, UL 94 |
| Processing | Dry at 80°C / 176°F for 2–4 h to 0.2 % moisture or less; melt 280–300°C (536–572°F); mold 50–100°C (122–212°F) | Data sheet processing section |
| Food contact | The data sheet makes no food-contact statement. Ask for the producer's regulatory letter for the exact grade and color. |
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 Zytel ST801
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 Zytel ST801, any change needs your approval and usually a trial.
| Grade | Producer | Melt flow | Density | Key property | How it compares |
|---|---|---|---|---|---|
| Vydyne 41 NT | Ascend Performance Materials | Not published | 1.08 g/cm³ (ISO 1183) | Notched Charpy 76 / 110 kJ/m² dry / conditioned at 23°C, 35 kJ/m² dry at -30°C (ISO 179/1eA); tensile modulus 2,200 MPa dry; HDT 58°C at 1.8 MPa | Closest match. General-purpose, high impact-modified PA66 designed for automotive low-temperature impact requirements. Room-temperature impact is close to ST801; check the cold-impact numbers against your requirement. Quote this alternative › |
| Ultramid A3Z | BASF | MVR 21 cm³/10 min (275°C / 527°F, 10 kg, ISO 1133) | 1.06 g/cm³ (ISO 1183) | Notched Charpy 90 / 115 kJ/m² dry / conditioned at 23°C, 70 kJ/m² at -30°C (ISO 179/1eA); tensile modulus 1,800 MPa dry; HDT 60°C at 1.8 MPa; UL 94 HB at 1.6 mm | Partial match. Impact-modified, stabilized PA66 for parts that need low-temperature toughness. A little softer than ST801 dry. Confirm the North American grade code and supply with BASF. Quote this alternative › |
| Vydyne 47 NT | Ascend Performance Materials | Not published | 1.10 g/cm³ (ISO 1183) | Notched Charpy 19 / 62 kJ/m² dry / conditioned at 23°C (ISO 179/1eA); tensile modulus 2,800 MPa dry; HDT 63°C at 1.8 MPa | Weaker match. Medium impact-modified, so stiffer but much less tough than ST801 when dry. Ask about it only if ST801 is more toughness than the part needs. Quote this alternative › |
From each producer's published data. Brand owners and grade names change; confirm on the current data sheet.
Typical uses for Zytel ST801
From the producer's data sheet and published listings:
- Injection-molded parts that need very high impact strength (an earlier DuPont sheet described ST801 as a general-purpose Super Tough nylon 66 with outstanding impact resistance and high productivity)
- The Zytel family is listed for automotive, furniture, domestic appliance, sporting goods and construction parts
- Check cold impact if parts see low temperatures: notched Charpy drops from 80 kJ/m² at 23°C to 18 kJ/m² at -30°C, dry (ISO 179/1eA)
What to check before you switch
- Toughness level: super-tough, high-impact and medium-impact PA66 grades differ a lot. Compare notched Charpy dry at 23°C and at -30°C, not just the word "toughened".
- Toughened nylons are softer and deflect at lower temperatures under load: ST801 has an HDT of only 64°C at 1.8 MPa (ISO 75). Check any part that carries load when warm.
- Compare dry-as-molded to dry-as-molded. ST801's tensile modulus falls from 2,000 to 900 MPa when conditioned. See nylon swelling and moisture.
- Shrinkage is relatively high (1.8 % parallel, 1.4 % normal on the ST801 sheet). Check critical dimensions on first articles.
- Same producer, different base polymer: Zytel ST7301 is a super-toughened nylon 6, not a nylon 66, so it is a different base polymer and not a direct swap. For background see impact-modified nylon.
- 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 Zytel ST801: 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 Zytel ST801 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 Zytel ST801 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
- Celanese Zytel ST801 NC010 data sheet, revised 2024 (Protolabs, PDF)
- DuPont Zytel ST801 NC010A product information, earlier edition (Protolabs, PDF)
- Ascend Vydyne 41 NT data sheet (PDF)
- BASF Ultramid A3Z data sheet (ALBIS, PDF)
- Ascend Vydyne 47 NT data sheet (PDF)
- Celanese Zytel ST7301 data sheet (distributor copy, PDF)
- askchemille.com product page
- askchemille.com product page
Common questions
What is Zytel ST801?
Zytel ST801 NC010 is Celanese's unreinforced, super-toughened nylon 66 (PA66-HI) for injection molding, used where impact resistance matters most.
What is the melt flow of Zytel ST801?
No melt flow rate is published on the current Celanese data sheet. Ask for the producer's viscosity or melt flow data if your process needs it.
What is equivalent to Zytel ST801?
Grades from other producers to ask about include Vydyne 41 NT, Ultramid A3Z and Vydyne 47 NT. None is identical; compare data sheets and run a trial, and get approval if your part names Zytel ST801.
Is Zytel ST801 food-contact compliant?
The data sheet makes no food-contact statement. Ask for the producer's regulatory letter for the exact grade and color before using it in a food-contact part.
Can ResinBridge quote Zytel ST801?
We quote Zytel ST801 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. We quote Zytel ST801 where we can source it, or a matched alternative, and say clearly which one you would get. 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 Zytel ST801 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 Zytel ST801 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?
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