Nylon is one of the most demanding polymers to color consistently.
A shade that looks correct in the laboratory may still change during melt processing, while the same colorant can behave differently depending on nylon grade, processing temperature, transparency requirements and final use.
For this reason, nylon coloration should not be approached simply by choosing a Color Index. The more reliable approach is to evaluate the complete application system.
Why Is Nylon Coloration Challenging?
Nylon is widely used in engineering plastics, fibers and technical components, where processing conditions can be relatively demanding.
Color performance may be affected by several factors.
Processing temperature is one of the most important. A colorant must maintain its shade and strength during melt processing without excessive color change.
Moisture condition also deserves attention. Nylon readily absorbs moisture, and insufficient drying may influence processing stability and final appearance.
Another important consideration is transparency versus opacity. Transparent nylon parts and fibers often require a different colorant strategy from opaque engineering components.
For pigment-based systems, dispersion and compatibility are critical. Poor dispersion may result in visible specks, uneven shade or filtration problems.
Finally, the required heat, light, migration and chemical resistance should always match the final application rather than being evaluated only from a generic data sheet.
Solvent Dyes or Organic Pigments?
There is no universal answer.
For applications requiring bright, transparent and high-color-strength effects, solvent dyes can be considered.
For applications requiring opacity, durability or specific fastness performance, organic pigments may be more suitable.
The current UPBRIGHT nylon application range covers a broad selection of both categories.
| Color Family | Solvent Dye Options* | Organic Pigment Options* |
|---|---|---|
| Yellow | SY160:1, SY135, SY98, SY21 | PY192, PY150, PY147, PY109, PY184, PY215 |
| Orange | SO60, SO63 | PO68, PO43 |
| Red | SR149, SR179, SR52 | PR122, PR149, PR179, PR202, PR214, PR264 |
| Blue | SB132, SB97, SB3R, SB104, SB128, SB122 | PB60, PB15:1, PB15:3 |
| Green | — | PG7, PG36 |
| Violet | — | PV29, PV23 |
| Brown | SBr53 | — |
*Based on the current nylon application list provided to UPBRIGHT. Some grades are marked as limited use and should not be treated as universally suitable.
The current list marks SY160:1, SY135, SO60, SR149, SB3R, SB122, PY147, PY109, PR122, PR202, PO43, PB60, PV29 and PV23 as limited-use grades. The source list does not specify the exact limitation for each product, so final suitability should be confirmed according to the actual resin system, processing conditions, regulatory requirements and performance target.
How Should a Nylon Colorant Be Selected?
A professional selection should begin with the application rather than the product name.
At UPBRIGHT CHEMICAL, we normally evaluate five key points:
Nylon type — PA6, PA66 or another polyamide system
Processing temperature — including residence time where relevant
Target shade — including current standard or reference sample
Transparency requirement — transparent, translucent or opaque
Final performance requirement — heat, light, migration, chemical resistance and other end-use conditions
With this information, the candidate range can be narrowed down much more effectively.
From Product Selection to Application Matching
The same Color Index may not deliver the same result in every nylon formulation.
Differences in resin grade, processing conditions, dosage, dispersion state and final product requirements can all influence the result.
That is why UPBRIGHT CHEMICAL focuses on application matching rather than simple product substitution.
For nylon coloration projects, we can support customers with grade screening, technical data, COA, sample evaluation and alternative grade comparison.
