365nm Organic UV Fluorescent Red Pigment for Security Printing & Polymers

Nichwell 365nm Organic UV Fluorescent Red Pigment is an engineered covert luminescent material designed for high-security printing, industrial anti-counterfeiting coatings, and functional polymers.

Under ambient daylight, it remains completely neutral and invisible without altering your base substrate’s aesthetics. When excited by standard 365nm long-wave UV light (UV-A), it instantly emits a brilliant, high-purity red fluorescence with sharp emission stability (610–612 nm).

Key Technical Advantages

Zero Nozzle & Screen Clogging: Our micro-milled grades feature an ultra-narrow particle size distribution ( $D_{97}$ tightly controlled), ensuring smooth runnability in fine-mesh silkscreen and high-speed gravure inks.
True Covert Invisibility: Exceptional stealth profile under natural lighting; leaves no visible trace, tint, or color shadow on white security paper or clear films.
High Luminescent Yield: High quantum yield ensures strong, vivid red fluorescence even at micro-dosing levels (0.5%–3.0%), minimizing formulation raw material costs.
Dual Dispersion Versatility: Available in surface-modified grades for direct solvent/resin dissolution, as well as ultra-dispersible micronized grades for solid polymer processing.
Global Regulatory Compliance: 100% organic formulation, RoHS compliant, and heavy-metal free.

365nm Organic UV Fluorescent Red Pigment Specifications:

Grade	Daylight Appearance	Emission Peak	Typical Particle Size (PSD)	Recommended Applications
Y3A	Off-white / Pale Pink	612 ± 5 nm	D50≤ 2.0 μm (Top Cut D90 ≤ 4.0 μm)	High-precision gravure, screen printing (>350 mesh), security inks
Y3B	Off-white / Pale Pink	612 ± 5 nm	D50 $\approx$ 10-13 µm	High thermal tolerance (>240°C); Masterbatches (PP/PE/ABS), extrusion
Y3C	Off-white / Pale Pink	612 ± 5 nm	D50 $\approx$ 15 µm	Solvent-based fluorescent varnishes, dip coatings, casting resins
Y3D	Off-white / Pale Pink	610 ± 5 nm	D50≤ 5.0 μm	Industrial security marking, synthetic leather coatings, rigid plastics
Y3E	Off-white / Pale Pink	610 ± 5 nm	D50≤ 3.5 μm (Top Cut D90 ≤ 8.0 μm)	Standard security inks, specialty overprint varnishes, thin coatings

Disclaimer & Data Tolerance:
The technical data and particle size distributions (PSD) listed above are typical reference values based on internal laser diffraction analysis (wet dispersion). Due to variations in testing equipment, dispersion methodology, and normal manufacturing lot tolerances, these values should not be construed as legally binding product specifications. The exact parameters for any commercial order will be strictly governed by the Certificate of Analysis (CoA) provided with the specific batch shipment. Customers are strongly advised to conduct thorough application testing in their specific binder systems before mass production.

Not sure which grade suits your application? Share your binder system, processing temperature and application requirements — our technical team will recommend the most suitable grade for testing.

Common Formulation Pain Points & How We Solve Them

1. Inks Clogging Fine Printing Screens or Gravure Cells?

The Cause: Coarse powder tailing or large agglomerates ( $> 10 μ m$ ).
Nichwell Solution: Switch to Grade Y3A. De-agglomerated via advanced nano/micro jet milling, eliminating oversize particles to guarantee zero downtime during high-speed printing runs.

2. Loss of Fluorescence During Plastic Extrusion?

The Cause: High processing temperatures decomposing standard organic fluorophores.
Nichwell Solution: Use Grade Y3B. Its crystalline structure resists high processing temperatures without color shift, fluorescence quenching, or yellowing.

3. Bleeding or Poor Compatibility in Resins?

The Cause: Surface tension mismatch between the pigment and polymer matrix.
Nichwell Solution: Our technical team provides tailored grade recommendations based on your carrier resin (acrylic, polyurethane, epoxy, PVC, or polyolefins).

Core Applications

Banknote & High-Security Documents: Intaglio security threads, passport stampings, visas, fiscal stamps, and tax bands.
Pharmaceutical & Brand Protection: Anti-tamper blister foils, invisible authentication QR/barcodes, luxury packaging.
Industrial Non-Destructive Testing (NDT): Fluorescent tracer detection, leak tracing, micro-crack penetrant inspection.
Security Plastics & Fibers: Anti-counterfeiting synthetic security yarns, card substrates, and polymer seals.

Frequently Asked Questions (FAQ)

Q: Is this pigment visible under normal daylight?

A: No. The pigment appears as a pale pinkish or white powder depending on the grade. When printed or incorporated into a substrate at typical loadings, it is virtually invisible to the naked eye under ordinary lighting conditions.

Q: What UV light source works best?

A: 365nm long-wave UV lamps or LEDs provide optimal excitation for this series. These pigments are designed and optimized for 365nm UV-A excitation. For 254nm UV-C applications, please refer to our dedicated 254nm UV fluorescent pigment series.

Q: Which grade should I choose for outdoor applications?

A: For extended outdoor exposure or high-heat plastic processing, choose Y3B, Y3D, or Y3E for enhanced UV and thermal resistance. For maximum initial fluorescent brightness in indoor applications, Y3A or Y3C is recommended.

Q: Can this pigment be used in water-based systems?

A: The pigment is primarily designed for solvent-based and UV-curable systems. For water-based applications, please contact our technical team for custom dispersion options.

Q: Do you provide samples?

A: Yes. Testing samples are available for qualified industrial and security printing customers. Please specify your application (ink, coating, plastic, etc.) and desired grade when requesting.

Q: Is this pigment suitable for food packaging applications?

A: The pigment is RoHS compliant and non-toxic. For specific food contact approvals, please request compliance documentation and consult with your regulatory team regarding your target market.

Request Your Tailored Testing Kit & Technical Datasheet (TDS)

Selecting the ideal grade depends on your binder system, dispersing equipment, and curing temperature.

Contact our technical engineering team today with your parameters:

What is your solvent/resin system (Water-based, Solvent, UV-curable, or Polymer resin)?
What is your processing temperature?
Which application (Screen ink, Gravure, Coating, or Masterbatch)?