Ultramid B3WG6: specs and equivalent grades
Ultramid B3WG6 is a PA6 GF30 from BASF. 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
Ultramid B3WG6 is a polyamide 6, 30% glass fiber (PA6-GF30), heat ageing resistant, from BASF. The data sheet lists viscosity number (dry) as 140 cm³/g (ISO 307, 1157, 1628). Density: 1.36 g/cm³ (1360 kg/m³). Grades from other producers to ask about include Zytel 73G30HSL NC010 and Vydyne B 30 GF NT KW2. They are not identical, so compare the data sheets and run a trial before switching.
Buying Ultramid B3WG6: from one gaylord to a railcar · supplier COA on every prime lot · Ultramid B3WG6 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.
Ultramid B3WG6 specs from the data sheet
Typical values from the producer’s published data sheet (Ultramid B3WG6 (uncoloured; BASF does not use an NC010-style code)). 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) | BASF | Data sheet |
| Polymer | Polyamide 6, 30% glass fiber (PA6-GF30), heat ageing resistant | |
| Process | Injection molding | |
| Viscosity number (dry) | 140 cm³/g (US-unit sheet: 3880 in³/lb) | ISO 307, 1157, 1628 |
| Melt volume-flow rate (MVR) | 30 cm³/10 min at 275 °C / 5 kg (same units on the US-unit sheet) | ISO 1133 |
| Density | 1.36 g/cm³ (1360 kg/m³) | ISO 1183 |
| Tensile modulus, dry / conditioned | 9500 / 6200 MPa (1.38 million / 899,000 psi) | ISO 527-1/-2 |
| Tensile stress at break, dry / conditioned | 185 / 115 MPa (26,800 / 16,700 psi) | ISO 527-1/-2 |
| Flexural modulus, dry / conditioned | 8600 / 5000 MPa (about 1.25 million / 725,000 psi, converted) | ISO 178 |
| Charpy notched impact, 23 °C, dry / conditioned | 15 / 30 kJ/m² (7.14 / 14.3 ft-lb/in²) | ISO 179/1eA |
| HDT at 1.8 MPa (HDT A), dry | 210 °C (410 °F) | ISO 75-1/-2 |
| HDT at 0.45 MPa (HDT B), dry | 220 °C (428 °F) | ISO 75-1/-2 |
| Melting temperature (DSC) | 220 °C (428 °F) | ISO 11357-1/-3 |
| Flammability | HB at 1.5 mm nominal (1.47 mm / 0.0579 in tested); HB at 3.05 mm; Yellow Card available | UL 94 / IEC 60695-11-10 |
| Moisture state | Values given dry / conditioned; moisture absorption 1.9 to 2.3 % at 23 °C / 50 % RH, water absorption 6.3 to 6.9 % at saturation | Similar to ISO 62 |
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 Ultramid B3WG6
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 Ultramid B3WG6, any change needs your approval and usually a trial.
| Grade | Producer | Melt flow | Density | Key property | How it compares |
|---|---|---|---|---|---|
| Zytel 73G30HSL NC010 | Celanese | Not published (no MFR or MVR); viscosity number 140 cm³/g | 1.36 g/cm³ (0.0491 lb/in³) | Tensile modulus 9500 / 6000 MPa (1.38 million / 870,000 psi) dry / conditioned; HDT 1.8 MPa 210 °C (410 °F); Charpy notched 23 °C 16 / 23 kJ/m² | Also a 30% glass, heat stabilized PA6 with very close published viscosity number, density and HDT. Conditioned stiffness, impact and shrinkage (0.2 / 0.6 %) differ from the BASF sheet, and the stabilizer package is Celanese's own. Confirm current regional availability with Celanese. Not a drop-in replacement. |
| Vydyne B 30 GF NT KW2 | Ascend Performance Materials | Not published (no MFR, MVR or viscosity number on the sheet) | 1.35 g/cm³ | Tensile modulus 9500 MPa (1.38 million psi) dry; HDT 1.8 MPa 210 °C (410 °F); Charpy notched 23 °C 15 kJ/m² (7.14 ft-lb/in²) dry | Ascend describes it as a standard flow, organic heat stabilized, lubricated PA6 with 30% glass, natural color. Dry values are close to B3WG6, but the sheet gives no conditioned data. Ascend specifies an organic heat stabilizer and a lubricant; BASF does not state its stabilizer type, so ask before assuming the two match. 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 Ultramid B3WG6
BASF describes B3WG6 as a glass fibre reinforced, heat ageing resistant injection molding grade used, for example, for automobile manifolds and pedals.
PA6 GF30 or PA66 GF30?
B3WG6 is the nylon 6 version. Nylon 6 melts lower than nylon 66 and usually molds more easily with a better surface finish, which suits glass-filled parts that do not see high sustained heat. When the part has to hold up closer to the melt, buyers usually step up to a PA66 GF30 such as Ultramid A3WG6. See PA6 GF30 properties and PA6 vs PA66.
What to check before you switch
- Check the part print and OEM specs; PA6 and PA66 glass grades are not interchangeable without approval, and neither are brands.
- Dry to the producer's moisture limit before molding and compare dry versus conditioned data for the end use.
- Run first-article dimensions; flow and cross-flow shrinkage of glass-filled PA6 varies by grade and tool.
- Confirm the color code (uncoloured vs black, for example BK00564) because data and approvals are code specific.
- Ask about heat stabilizer type (organic vs other systems) if the part sees long-term heat or electrical contact.
Buying Ultramid B3WG6 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 Ultramid B3WG6 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 Glass-filled nylon 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
- BASF SE Product Information, Ultramid B3WG6, 09/2026
- BASF Ultramid B3WG6 data sheet, US units (Material Data Center data, hosted by Albis)
- BASF Ultramid B3WG6 data sheet, SI units (Material Data Center data, hosted by Albis)
- Celanese Zytel 73G30HSL NC010 TDS (SI)
- Celanese Zytel 73G30HSL NC010 TDS (US units)
- Ascend Vydyne B 30 GF NT KW2 record (SI units)
- Ascend Vydyne B 30 GF NT KW2 record (US units)
Common questions
What is Ultramid B3WG6?
Ultramid B3WG6 is BASF's 30% glass fiber reinforced, heat ageing resistant nylon 6 (PA6-GF30) for injection molding. BASF cites automobile manifolds and pedals as typical uses.
What is the melt flow or viscosity of Ultramid B3WG6?
BASF lists a viscosity number of 140 cm³/g (ISO 307) and an MVR of 30 cm³/10 min at 275 °C under 5 kg (ISO 1133).
What is equivalent to Ultramid B3WG6?
Grades with similar published specs include Celanese Zytel 73G30HSL NC010 and Ascend Vydyne B 30 GF NT KW2. Both are heat stabilized PA6 with 30% glass, but stabilizer and lubricant packages are producer specific and approvals differ, so none is a drop-in replacement.
Is Ultramid B3WG6 food contact compliant or UL listed?
The BASF sheet does not state food contact status, so ask BASF. It lists UL 94 HB at 1.5 mm nominal and at 3.05 mm, and says a UL Yellow Card is available.
Can ResinBridge quote Ultramid B3WG6?
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 Ultramid B3WG6 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 Ultramid B3WG6 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.