PIGMENT YELLOW 138/ HP YELLOW 1311
opauqe
Technical Information
C.I.NO.: PY138
Advantage: opauqe
Main Application Recommended: Printing inks, Plastics
Product Description – PY138
HP YELLOW 1311 (PIGMENT YELLOW 138) is quinophthalone pigments afford exceedingly lightfast and weather fast greenish yellow shadeswith good heat stability. It is entirely or at least largely re_x0002_sistant to a large number of organic solvents, such as alcohols, esters, ketones, and aliphatic as well as aromatic hydrocarbons. It is opauqe type mainly used in paints and in plastics.
Recommended Application：
Coatings: solvent based paints, water based paints, industrial coatings, powder coatings, coil coatings, auto paints, wood coatings
Plastics: PP, PE, PVC, PS/SAN, ABS, PC, PA, PBT, Rubber/ TPV
Printing inks: offset inks, solvent based inks
Technical Data:
| Product Information | ||||
|---|---|---|---|---|
| Chemical Type | Quinophthalone | CAS NO. | 30125-47-4 | |
| C. I. Name | Pigment Yellow 138 | EINECS / ELINCS NO. | 250-063-5 | |
| C. I. Constitution No. | 56300 | Chemical Formula | C26H6Cl8N2O4 | |
| Technical Performance | ||||
|---|---|---|---|---|
| Full Shade | Tint | |||
| Full Shade | Tint | |||
| Weather Resistance | 5 | 5 | Heat Stability °C | 290°C |
| Light Fastness | 8 | 8 | ||
| Physical Properties | ||||
|---|---|---|---|---|
| Physical Form | Powder | Resistance to Acid | 5 | |
| Specific Density (g/cm3): | 1.82 ± 0.1 | Resistance to Alkali | 5 | |
| Specific Surface(㎡/g): | 24 | Migration resistance PVC | 5 | |
| Oil Absorption | 35 ± 10 | Low warping applications | Suitable | |
| pH Value | 5.0 – 8.0 | |||
| Volatile Matter | 1% max | |||
| Packaging | ||||
|---|---|---|---|---|
| 10kgs/bag 400kgs/Pallet | ||||
| Storage Shelf Life 5 years | ||||
| Should be stored in cool, dry and ventilate place. |
| TRANSPORTATION | ||||
|---|---|---|---|---|
| Avoid inversion, sunlight, moisture and crash. Avoid damage the package. |
- Light fastness: Light fastness rating is assessed on 1 to 8 Blue Wool scale where 1 = ‘Poor’ and 8 = ‘Excellent’.
- Heat Stability : Heat stability values given indicate the maximum temperature at which the pigment can be stoved for 10 min. on the full shade and in reductions without undergoing any significant change in shade.
- Oil absorption: The oil absorption is determined on the basis of EN ISO 787-5 and given in g linseed oil per 100 gm. pigment.
- Solvent bleeding: The bleeding in solvents is tested using the powder grades and the visual rating given on 1 to 5 Grey scale
where 1 = ‘Heavy bleeding’ and 5 = ‘No bleeding”
Technical Note — The data and recommendations provided are based on HONOR Pigment’s internal testing and manufacturing experience. They are offered in good faith to assist customers in evaluating product suitability for their specific applications. As processing conditions, formulations, and end-use requirements vary widely, customers should conduct their own validation under actual use conditions. HONOR Pigment makes no warranties, express or implied, regarding the accuracy of this information or its fitness for any particular purpose. Nothing herein shall be construed as a license or recommendation to infringe any patent. HONOR Pigment’s standard terms and conditions of sale apply.oduct contains particles < 0.1 μm. Any user of this product is responsible for determining the suitability of Honor Pigments’s products for its particular application & to ensure that any proprietary rights & existing laws & legislation are observed.
Why Choose Honor Pigments?
- 🌍 Global Export Expertise — Trusted by customers in 40+ countries for consistent quality and reliable supply
- ✅ Strict Quality Control — ISO 9001 certified with batch-to-batch consistency and zero-defect policy
- 💰 OEM Production Advantage — Competitive pricing without compromising pigment performance
- 🧪 Technical Support — Free color matching, formulation advice and sample testing before bulk order
📩 Need more details?
Request TDS, SDS, or a free sample for testing.
Frequently Asked Questions — PIGMENT YELLOW 138
What makes PIGMENT YELLOW 138 (PY138) suitable for plastics masterbatch in PP, PE, and ABS?
PIGMENT YELLOW 138 (C.I. 56300, CAS 30125-47-4) is a quinophthalone pigment with excellent heat stability up to 260°C, making it ideal for plastics like PP, PE, PVC, and ABS. Its opaque greenish-yellow shade combined with high lightfastness and weather resistance ensures color retention during high-temperature processing and outdoor use. The pigment also shows good migration resistance in polyolefins, reducing bleed in multilayer films.
How does the opaqueness of PY138 compare to other organic yellows in printing inks?
PY138 provides superior opaqueness due to its high refractive index and crystalline structure, outperforming many organic yellows like PY13 or PY83 in hiding power. In offset and solvent-based inks, this opacity reduces substrate show-through while maintaining a bright greenish-yellow hue. Its resistance to alcohols, esters, and ketones makes it suitable for solvent-based gravure and flexo inks where color strength and process stability are critical.
Is PIGMENT YELLOW 138 resistant to acids and organic solvents in industrial coatings?
Yes, PY138 shows very good resistance to acids and a wide range of organic solvents (alcohols, esters, ketones, aliphatic hydrocarbons). In industrial coatings, this translates to stable color in chemical-plant environments and paint storage. The pigment maintains its shade in solvent-based and water-based systems when properly dispersed with wetting agents, making it a reliable choice for coil coatings and wood paints.
What lightfastness and weather resistance can I expect from PY138 in exterior paint?
PY138 delivers outstanding lightfastness (8 on the blue wool scale) and excellent weather resistance in exterior coatings. In auto paints, powder coatings, and industrial paints, it withstands long-term UV exposure without significant fade or chalking. For maximum performance, a particle size distribution of 0.1–0.5 μm is recommended to ensure uniform dispersion and surface gloss.
Can PY138 be used in water-based printing inks without stability issues?
Yes, PY138 can be formulated into water-based ink systems using suitable dispersing agents and wetting aids. The pigment’s chemical stability (quinophthalone structure) prevents hydrolysis during pH adjustments. In flexo and gravure water-based inks, it offers high color strength, transparency control, and good flow properties. For best results, use an alkali-soluble resin as the binder and optimize milling time to 30–45 minutes.