Vydyne 21SPC: specs and equivalent grades
Ascend general-purpose, unfilled, lubricated 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
Vydyne 21SPC is Ascend Performance Materials’ general-purpose, unfilled, lubricated polyamide 66 (PA66), designed mainly for injection molding. Ascend filed for Chapter 11 in April 2025 and emerged on December 19, 2025 with a new ownership group; Vydyne is still an Ascend brand. Ascend publishes no melt flow rate or viscosity number for 21SPC. Density is 1.14 g/cm³ (ISO 1183), tensile modulus is 2,800 MPa dry and 1,800 MPa conditioned (ISO 527-2), and HDT is 70°C / 158°F at 1.8 MPa (ISO 75-2/A), per Ascend’s data sheet updated April 2026. Grades from other producers to ask about include Zytel 101L and Ultramid A3K. They are not identical, so compare the data sheets and run a trial before switching.
Also written as: Vydyne 21SPC (natural color), Vydyne 21 SPC, 21SPC. Quote the full code from your drawing or bag label; color and additive suffixes change the grade.
Buying Vydyne 21SPC: 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.
Vydyne 21SPC specs from the data sheet
Typical values from Ascend’s Vydyne 21SPC data sheet (last updated April 2026). Dry / conditioned values are shown where Ascend 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) | Ascend Performance Materials | Ascend emerged from Chapter 11 on December 19, 2025 with about $1.3 billion less debt and a new ownership group; Vydyne remains an Ascend brand |
| Polymer | Polyamide 66 (nylon 66), unfilled | ISO 1043: PA66 |
| Additives | Lubricant (Ascend lists good mold release) | Data sheet |
| Process | Injection molding | |
| Melt flow / viscosity | Not published on the data sheet | |
| Density | 1.14 g/cm³ | ISO 1183 |
| Tensile modulus, dry / conditioned | 2,800 / 1,800 MPa (406,000 / 261,000 psi) | ISO 527-2, 23°C |
| Tensile stress at yield, dry / conditioned | 86 / 56 MPa (12,500 / 8,120 psi) | ISO 527-2 |
| Tensile stress at break, dry / conditioned | 56 / 46 MPa | ISO 527-2 |
| Tensile strain at yield / break, dry | 4.8 % / 23 % | ISO 527-2 (conditioned: 22 % / 87 %) |
| Flexural modulus, dry / conditioned | 2,900 / 1,500 MPa | ISO 178 |
| Flexural strength, dry / conditioned | 80 / 50 MPa | ISO 178 |
| Notched Charpy impact, dry / conditioned | 23°C: 6 / 20 kJ/m²; −30°C: 5 / 7 kJ/m² | ISO 179/1eA |
| HDT at 1.8 MPa / 0.45 MPa (dry) | 70°C / 158°F; 200°C / 392°F | ISO 75-2/A |
| Melting temperature | 260°C / 500°F | ISO 11357-3 |
| UL relative thermal index | Electrical 130°C; mechanical with impact 75°C; mechanical without impact 75–85°C (0.4–3.0 mm) | UL 746; UL file E70062 |
| Mold shrinkage, flow / across flow | 1.8 % / 1.7 % (2.00 mm) | ISO 294-4 |
| Water absorption: 24 h; equilibrium 50% RH | 1.2 %; 2.4 % | ISO 62, 23°C |
| Flammability | UL 94 V-2 at 0.4, 0.71, 1.5 and 3.0 mm; glow wire flammability index 960°C; oxygen index 25 % | UL 94; IEC 60695-2-12; EN ISO 4589-2 |
| Agency ratings listed | FDA 21 CFR 177.1500; EU 10/2011; EC 1935/2004; EU 2023/2006; NSF STD-51; ASTM D4066 / D6779 PA0111; SAE J1639 PA0121 Z6; FED L-P-410A; MIL M-20693B | Data sheet; ask Ascend for a current letter for your application |
| Drying | 70°C / 158°F for 1–3 h | Data sheet, injection section |
| Melt temperature | 285–300°C (545–572°F); barrel rear 260–280°C, middle 270–285°C, front 280–290°C, nozzle 280–300°C | Data sheet |
| Mold temperature | 65–95°C (149–203°F) | Data sheet |
| Packaging forms | Not published on the data sheet | Data sheet lists pellets |
Source data sheets are listed at the bottom of this page. Confirm against the current sheet for your exact grade code and color.
Ascend notes that the material is produced at multiple sites with differing specification approvals, so confirm the approvals you need for the plant that supplies your lot.
Grades to ask about instead of Vydyne 21SPC
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 Vydyne 21SPC, any change needs your approval and usually a trial.
| Grade | Producer | Melt flow | Density | Key property | How it compares |
|---|---|---|---|---|---|
| Zytel 101L NC010 | Celanese | Not published (VN 150 cm³/g, ISO 307) | 1.14 g/cm³ (ISO 1183) | Tensile modulus 3,100 / 1,400 MPa dry / conditioned (ISO 527-2); yield stress 82 / 55 MPa; HDT 70°C at 1.8 MPa; UL 94 V-2 at 0.71 and 1.5 mm | Close match. Unreinforced PA66 with mold release, same density and HDT. Stiffer dry, softer conditioned than 21SPC on the two sheets. Celanese’s current grade record confirms density, viscosity number, modulus, yield stress and HDT; the UL 94 rating is from the 2018 DuPont-era sheet. Celanese has owned Zytel since November 2022. No food-contact statement on the Zytel sheet. Quote this alternative › |
| Ultramid A3K | BASF | MVR 120 cm³/10 min (275°C / 527°F, 5 kg, ISO 1133); VN 150 cm³/g | 1.13 g/cm³ (ISO 1183) | Tensile modulus 3,000 / 1,100 MPa dry / conditioned (ISO 527); yield stress 85 / 50 MPa; HDT 75°C at 1.8 MPa | Close match. Easy-flowing unfilled PA66 for fast processing, used for bearings and gear wheels. BASF’s product information shows no UL 94 rating and no food-contact statement, where 21SPC lists V-2 and FDA. Quote this alternative › |
From each producer’s published data. Brand owners and grade names change; confirm on the current data sheet.
Typical uses for Vydyne 21SPC
Ascend lists no specific end uses; it describes 21SPC as a general-purpose PA66 for injection molding. Based on the features and ratings on its data sheet, it suits:
- Parts that need high strength, rigidity and good toughness
- Parts that rely on good surface lubricity and abrasion resistance
- Parts exposed to machine and motor oils, solvents and gasoline (Ascend lists resistance to many chemicals)
- Food-contact and food-equipment parts where the FDA 21 CFR 177.1500, EU 10/2011 or NSF STD-51 ratings listed on the sheet apply (confirm with Ascend)
- Electrical parts that need UL 94 V-2 down to 0.4 mm and a glow wire flammability index of 960°C
What to check before you switch
- Heat aging: 21SPC lists a lubricant only, no heat stabilizer. If the part sees continuous heat, ask about a heat-stabilized PA66 such as Zytel 103HSL or Ultramid A3W.
- Food contact and NSF: 21SPC lists FDA, EU and NSF 51 ratings. Zytel 101L and Ultramid A3K sheets make no such statement, so get the producer’s letter before switching a food-contact part.
- Military and federal callouts: 21SPC lists MIL M-20693B and FED L-P-410A. An alternative must carry the same listing if your drawing names it.
- Flow: Ascend publishes no viscosity number. Ultramid A3K is BASF’s easy-flow grade (MVR 120 cm³/10 min), so check fill and packing on a trial.
- Dry before molding. Ascend lists 70°C for 1–3 h; other producers list 80°C. See the resin drying guide.
- Compare values at the same conditioning (dry as molded vs 50% RH) and ISO method.
- Run a trial lot and check shrinkage, cycle time and appearance before you switch production.
Buying Vydyne 21SPC: 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 Vydyne 21SPC itself or can accept a matched alternative. See how resin is priced, nylon price per pound 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 Vydyne 21SPC 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
- Ascend Vydyne 21SPC data sheet, April 2026 (PDF)
- Ascend: emergence from Chapter 11 (Dec 19, 2025)
- Celanese Chemille grade record, Zytel 101L NC010 (checked Oct 31, 2026)
- Zytel 101L NC010 technical data sheet, UL Prospector copy, May 2018 (PDF; UL 94)
- BASF Ultramid A3K product information, 09/2026 (PDF)
Common questions
What is Vydyne 21SPC?
Vydyne 21SPC is Ascend Performance Materials’ general-purpose, unfilled, lubricated polyamide 66, designed mainly for injection molding.
What is the melt flow of Vydyne 21SPC?
Ascend’s data sheet publishes no melt flow rate or viscosity number for 21SPC. Ask Ascend, or compare flow on a trial.
What is equivalent to Vydyne 21SPC?
Grades from other producers to ask about include Zytel 101L and Ultramid A3K. None is identical; compare data sheets and run a trial, and get approval if your part names Vydyne 21SPC.
Is Vydyne 21SPC food-contact compliant?
Ascend’s sheet lists FDA 21 CFR 177.1500, EU 10/2011, EC 1935/2004 and NSF STD-51 among its agency ratings. Ascend also notes approvals differ by production site, so ask for a current letter for your lot and application.
Can ResinBridge supply Vydyne 21SPC?
We quote Vydyne 21SPC 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 Vydyne 21SPC 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 Vydyne 21SPC 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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