Chip Quik NC191AX50 Leaded Solder Paste 50g
- Sn63/Pb37 leaded alloy, melts at 183 C (361 F)
- T4 powder, 20 to 38 microns
- 90% metal by weight
- 50 g jar
- Synthetic no-clean flux, ROL0 classification
- Halogen free, EN14582 test method
- Refrigerate at 3 to 8 C, do not freeze
Last refreshed Sep 28, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A leaded no-clean solder paste in a jar with a heavier metal load and a coarser powder grade. The alloy contains lead, and the paste needs cold storage and time to warm up.
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ASIN: B08KR8FDD1Model: NC191AX T4Category: Solder
Overview
A repair bench or assembly line running a leaded process is where this Chip Quik jar of Smooth Flow paste belongs. The synthetic no-clean flux vehicle is built for better spread and improved flow during heating.
The reason to buy it is a larger quantity of leaded no-clean paste in a jar, with shelf life and stencil life figures stated for planning. The limitation is that it is not lead-free and must be kept cold and tempered before each use.
Who it's for
Assembly teams with leaded processes and a refrigerator for storage can work through the jar over its stated shelf life. Hobbyists wanting a few joints, or anyone required to use lead-free materials, should choose another product.
Pros and cons
- Higher metal content by weight
- Halogen free per test method
- No-clean synthetic flux
- Stencil life figures given
- Needs cold storage and warm-up
- Not suited to occasional use
Performance notes
The lower density flux vehicle is meant to spread better under shear and flow well while heating. Stencil life is longer in drier air and shorter at higher humidity, so print sessions are planned around the room. The paste should warm to operating temperature before use to behave as specified.
Specifications
| Brand | Chip Quik |
|---|---|
| Model | NC191AX T4 |
| Dimensions & fit | |
| Particle size | T4 (20 to 38 microns) |
| Size | 50 g jar |
| Item weight | 1.76 ounces |
| Construction & materials | |
| Shelf life | Over 12 months refrigerated, over 6 months unrefrigerated |
| Other details | |
| Alloy ratio | Sn63/Pb37 (leaded) |
| Melting point | 183 C (361 F) |
| Flux type | Synthetic no-clean |
| Halogen | Halogen free (EN14582) |
| Metal content | 90% by weight |
| Flux classification | ROL0 |
| Stencil life | Over 8 hours at 20 to 50% RH, over 4 hours at 50 to 70% RH (22 to 28 C) |
| Storage | Refrigerate at 3 to 8 C (37 to 46 F), do not freeze |
Frequently asked questions
Is Chip Quik NC191AX50 a lead-free paste or a solder wire?
No. It is a leaded Sn63/Pb37 solder paste sold in a 50 g jar, not wire and not lead-free.
How long does Chip Quik NC191AX50 last?
Shelf life is over 12 months refrigerated and over 6 months unrefrigerated, according to the listing.
Does Chip Quik NC191AX50 need to be warmed before use?
Yes. Allow 4 hours for the paste to reach an operating temperature of 20 to 25 C (68 to 77 F) before use.