Thermochromic Pigments for Industrial Applications

Reversible and irreversible thermochromic pigment powders for compatible inks, coatings, plastics, packaging and temperature indicators.

Nichwell supplies reversible and irreversible Thermochromic pigment powders for plastics, printing inks, coatings, textiles, packaging, anti-counterfeiting labels and industrial temperature indicators.

Tell us your application, binder or resin, processing temperature and required color transition. We will recommend a suitable pigment grade for testing.

Reversible and irreversible color-change options
Color-to-colorless, colorless-to-color and selected color-to-color effects
Standard and selected custom activation temperatures
Typical particle-size options from 2–10 µm
Test samples, TDS and SDS available on request
Technical support for compatible inks, coatings and plastics
Nichwell operates under an ISO 9001-certified quality management system.

Thermochromic Pigment Types and Specifications:

Thermochromic pigments respond to specified temperature changes by producing a visible color transition. Grade selection depends on the required activation temperature, recovery behavior, color effect, formulation and processing conditions.

Product Type	Color Change Behavior	Activation Temperature	Typical Applications
Reversible Grade	Color to colorless	5°C – 70°C	Plastics, textiles, packaging and interactive products
Reverse-Change Grade	Colorless to color	35°C, 40°C, 50°C or 60°C	Temperature indicators, electronics and heat-activated graphics
Reversible Grade	Color to color	5°C – 70°C	Toys, packaging, textiles and promotional products
Irreversible Grade	Product-dependent permanent transition	50°C – 120°C	Overheat warning, sterilization indicators and temperature-exposure labels

Key Technical Specifications

General Properties

Chemical System: Typical Reversible System: Microencapsulated thermochromic system based on leuco-dye chemistry
Particle Size (D50): Typically 2–10 μm
Microcapsule Shell: Insoluble transparent polymer shell (thickness ~0.2–0.5 µm)
Appearance: Fine powder in various base colors
Shelf Life: Typically 24–36 months when stored in the original sealed packaging under recommended conditions

Available Colors and Effects

Applications and Processing Guidance

Plastics and Rubber Applications

Selected thermochromic pigments can be evaluated for transparent or translucent plastic and rubber systems, including PP, PE, ABS, PVC, silicone and compatible resin systems.

Typical applications include:

Temperature-sensitive spoons
Color-changing toys
Plastic containers
Silicone products
Electronic device housings
Overheat warning components
Promotional products

The typical dosage is 0.5%–2.0% by weight. For deeper colors or colored substrates, the dosage may be adjusted up to approximately 2.5%–3.0% after testing.

Lower processing temperatures, shorter residence times and low-shear mixing are recommended to protect the microcapsules.

Recommended Form: Powder Grade (D50: 2–5 µm) | Standard Dosage: 0.8%–1.5%

Printing Inks and Coatings

Thermochromic pigments can be evaluated for compatible screen-printing, flexographic, gravure and coating systems.

Typical applications include:

Anti-counterfeiting labels
Temperature-warning labels
Interactive packaging
Textile printing
Security inks
Heat-sensitive graphics
Overheat indicators
Tamper-evident labels

Compatibility with the binder, solvent, pH, curing temperature and printing process must be tested before production.

For water-based systems, a pH range of approximately 2–8 is generally recommended. Avoid aggressive solvents, incompatible short-chain alcohols and excessive shear.

Recommended Form: Slurry / Liquid Dispersion (Water-based) or Micronized Powder | Standard Dosage: 5%–12%

Textiles and Apparel

Thermochromic pigments can be incorporated into compatible textile-printing systems to create reversible color-changing designs.

Typical applications include:

T-shirts and sweatshirts
Sportswear
Shoes and hats
Fashion accessories
Towels and textile products
Promotional apparel

Wash resistance and service life depend on the binder, printing process, curing conditions and protective coating.

Packaging and Security Printing

Thermochromic pigments can create heat-activated verification and interactive effects in compatible packaging, labels and printing systems.

Typical applications include:

Brand-protection labels
Authentication marks
Heat-sensitive packaging
Tickets and certificates
Tamper-evident labels
Promotional graphics

Custom activation temperatures and color transitions can be evaluated according to the required verification method.

Industrial Temperature Indicators

Reversible pigments provide repeatable visual temperature indication, while irreversible products can record a specified temperature-exposure event.

Typical applications include:

Electrical equipment
Battery systems
Electronic components
Industrial machinery
Safety warning labels
Overheat indicators
Sterilization indicators
Temperature-traceability labels

For permanent over-temperature recording, select a permanently irreversible product.

Processing & Formulating Best Practices

Optimizing UV & Weather Resistance:

While leuco-dye microcapsules are naturally light-sensitive, exterior stability can be effectively prolonged. For outdoor packaging, automotive trims, or architectural signage, Nichwell recommends co-formulating with compatible hindered amine light stabilizers (HALS) / UV absorbers, or applying an acrylic/PU protective clear topcoat. Our lab can advise on stabilizing packages based on your accelerated weathering targets.

Dispersion & Shear Management:

To preserve the 0.2–0.5 µm protective polymer shell, thermochromic powders should be introduced during the final blending stage using low-to-medium shear dispersion (e.g., paddle mixers or standard dissolver disks at controlled RPM). Bead milling and three-roll grinding are unnecessary due to the pigment’s uniform pre-micronized particle size ( 2–10 µm).

Thermal Processing Envelope (Up to 240°C):

Nichwell’s high-heat grades are engineered to withstand peak short-term processing temperatures of 230°C–240°C during injection molding and extrusion. To ensure 100% color-recovery yield in PP, PE, or ABS, we advise keeping residence times in the barrel under 2–3 minutes and adopting a reversed temperature profile. Contact our plastics engineering team for recommended barrel settings.

Frequently Asked Questions

Q1: Do you supply Thermochromic Powder for direct compounding, or pre-dispersed forms?
A: Yes. Nichwell supplies microencapsulated thermochromic powder as our primary industrial grade for plastic extrusion, masterbatch compounding, and dry blending. For liquid systems, we also provide compatible thermochromic slurry and liquid dispersions to eliminate high-shear grinding risks in water-based inks and coatings.

Q2: Can Nichwell’s Thermochromic Pigment replace conventional Thermochromic Dye?
A: Yes, and in most industrial formulations, microencapsulated thermochromic pigment is technically superior to standard thermochromic dye. While traditional soluble dyes suffer from solvent leaching, migration, and lower thermal thresholds, our encapsulated pigment system isolates the leuco chemistry, offering higher heat tolerance (up to 230°C–240°C) and broad compatibility with PP, PE, ABS, and acrylic systems.

Q3: What activation temperatures are available, and can they be customized?
A: Standard reversible stock grades are available from 5°C to 70°C (including popular body-heat 31°C and scald-warning 45°C). Irreversible grades are standard at 50°C to 120°C. Custom activation thresholds from approximately -10°C to 120°C can be engineered based on your target resin, solvent system, and volume requirements.

Q4: Can these pigments tolerate high-temperature plastic injection molding (e.g., 230°C–240°C)?
A: Yes. Nichwell’s high-heat plastic grades feature reinforced microcapsule shells that tolerate peak short-term processing temperatures of 230°C–240°C under controlled conditions. We recommend low-shear screw configurations, keeping residence times under 2–3 minutes. Recommended dosage is typically 0.5%–2.0% by weight.

Q5: Are your thermochromic pigments compliant with RoHS, REACH, and safety regulations?
A: Yes. Nichwell operates under a certified ISO 9001 quality management system governing all batch inspections and packaging standards. For the European market, our thermochromic grades are EU REACH compliant through full upstream authorized documentation and designated Only Representative (OR) coverage, ensuring hassle-free clearance and regulatory peace of mind. Full RoHS verification, Safety Data Sheets (SDS per OSHA/GHS), and official compliance certificates are available upon request for regulatory audits.

Q6: What is the minimum order quantity (MOQ), and can we request lab evaluation samples?
A: We supply 50g–100g test sample kits alongside complete TDS/SDS to qualified industrial R&D teams, dispatched within 48 hours. For commercial orders, standard in-stock grades have an MOQ as low as 1–5 kg, while custom activation batches are evaluated on a project basis.

Ready to Evaluate Nichwell Thermochromic Pigment in Your Lab?

Receive 50g–100g test batches, matching TDS, Batch Certificate of Analysis (COA)

Tell us in your inquiry: 1. Your Base Resin / System (e.g., PP injection, solvent ink, epoxy) 2. Target Transition (e.g., 31°C Black to Clear, 45°C Red to Yellow) 3. Maximum Processing Temperature & Residence Time

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