Pigment Red 48:1 – Barium Lake Monoazo Red | Honor Pigments
Pigment Red 48:1 barium-lake monoazo red with yellowish-red shade, 200-240°C PE heat resistance, good solvent fastness for offset inks and plastics.
Pigment Red 48:1 — Barium-Lake Monoazo Red for Offset Ink, Plastics, and Industrial Paints
A barium-lake BONA monoazo red (C.I. 15865:1) delivering yellowish-red shades, 200-240°C heat stability in PE, and good solvent fastness for printing inks and polyolefin coloring.
Product Overview
Pigment Red 48:1 is the barium salt of a BONA (β-oxynaphthoic acid) monoazo red, C.I. 15865:1, produced by diazotizing 2B acid (2-amino-4-chloro-5-methylbenzenesulfonic acid) and coupling onto 2,3-acid, then laking with barium. It affords light yellowish to medium red shades that depend on the specific surface area of the product, and is the most coloristically versatile member of the PR48 metal-salt family.
In full shade, the pigment reaches Blue Scale step 3 in plastics, and 1/3 standard-depth (SD) PE colorations with 1% TiO2 are heat stable at 200-240°C for 5 minutes. The pigment shows good fastness to esters, ketones, and aliphatic and aromatic hydrocarbons, but only poor resistance to soap, alkali, and acid. A 0.34% loading formulates a 1/3 SD PE coloration with 1% TiO2. These properties position PR48:1 for offset printing inks, LDPE and PE coloring, and inexpensive industrial paints.
Key Benefits
Yellowish-Red Shade for Offset Ink
PR48:1 affords light yellowish to medium red shades, considerably yellower than PR57:1 and noticeably bluer than PR53:1 (Industrial Organic Pigments, 3rd ed.). Resinated grades improve print transparency and reduce bronzing.
200-240°C Heat Stability in PE
1/3 SD PE formulations with 1% TiO2 withstand 200-240°C for 5 minutes, depending on the type (Industrial Organic Pigments, 3rd ed.). Higher temperatures shift the shade bluer and duller.
High Tinctorial Strength
0.34% pigment formulates a 1/3 SD PE coloration with 1% TiO2. Tinctorial strength is high, though below PR53:1 grades.
Good Solvent Fastness
Fastness to esters, ketones, and aliphatic and aromatic hydrocarbons is good, supporting solvent-borne ink and coating systems.
Good Migration Fastness in Plasticized PVC
The pigment is stable to blooming and almost completely bleed resistant in plasticized PVC, making it suitable for flexible PVC coloring.
Technical Specifications
| Property | Value |
|---|---|
| Color Index | Pigment Red 48:1 |
| C.I. Number | C.I. 15865:1 |
| Chemical Class | Monoazo lake (barium salt, BONA) |
| CAS Number | 7585-41-3 |
| Molecular Formula | C18H15ClN2O6S (parent acid) |
| Molecular Weight | 422.84 |
| Appearance | Red powder |
| Shade | Light yellowish to medium red |
| Lightfastness | Blue Scale 3 (full shade, plastics); 5-6 (full shade, paint) |
| Heat Resistance | 200-240°C (5 min, PE 1/3 SD); 180°C (10 min) / 160°C (30 min, paint) |
| Tinting Strength | 0.34% for 1/3 SD PE with 1% TiO2 |
| Solvent Resistance | Good (esters, ketones, aliphatic and aromatic hydrocarbons) |
| Acid Resistance | Poor |
| Alkali Resistance | Poor |
| Soap Resistance | Poor |
| Migration Resistance | Good in plasticized PVC; stable to blooming, almost completely bleed resistant |
Applications Matrix
| Industry | Applications | Typical Loading | Notes |
|---|---|---|---|
| Printing Inks | Offset / letterpress printing inks; Packaging inks; Publication inks | 12-22% on vehicle | Main application field; resinated grades enhance transparency and reduce bronzing; prints may lack resistance to DIN 16524 solvent mixture and clear lacquer |
| Plastics | LDPE and PE coloring (recommended); Plasticized PVC; Polyolefin compounds | 0.34% for 1/3 SD PE with 1% TiO2 | Recommended especially for LDPE; good migration fastness in plasticized PVC; avoid open-steam vulcanization (bleeds into wrapper) |
| Industrial Paints | Inexpensive industrial paints; Air-drying and oven-drying systems | 5-12% on binder | Good fastness to overpainting; full-shade lightfastness 5-6; loses lightfastness as TiO2 increases; not for exterior use |
Competitive Comparison
Positioning
Pigment Red 48:1 is a barium-lake BONA monoazo red positioned for offset ink, polyolefin, and industrial paint formulators who need a cost-effective yellowish-red with 200-240°C PE heat stability and good solvent fastness.
vs. DIC Corporation
DIC (Sun Chemical) carries a full PR48 red-lake range with global regulatory documentation and batch-to-batch consistency. Pigment Red 48:1 delivers the same barium-lake yellowish-red shade for Asia-Pacific supply chains at a lower cost.
vs. Heubach
Heubach supplies azo red lakes with international certification. Pigment Red 48:1 matches the standard barium-lake color target with competitive China domestic pricing.
vs. Sudarshan
Sudarshan’s red-lake pigments offer broad global distribution. Pigment Red 48:1 provides comparable barium-lake performance with established supply-chain availability.
vs. PR48:2 (calcium lake)
PR48:2 (calcium salt) is bluer (ruby) and more lightfast (Blue Scale 4-5 vs 3-4), but inferior in soap and sterilization fastness. PR48:1 (barium salt) is preferred for offset inks and LDPE where cost and soap fastness matter.
Frequently Asked Questions
What is Pigment Red 48:1 and its chemical composition?
Pigment Red 48:1 (C.I. 15865:1) is the barium salt of a BONA monoazo red pigment. It is made by diazotizing 2B acid (2-amino-4-chloro-5-methylbenzenesulfonic acid), coupling onto 2,3-acid, and converting to the barium lake. The parent acid has the formula C18H15ClN2O6S and molecular weight 422.84; the CAS number of the barium lake is 7585-41-3.
What is the difference between Pigment Red 48:1 and Pigment Red 48:2?
The two differ by metal. PR48:1 is the barium salt and gives light yellowish to medium red shades; PR48:2 is the calcium salt and gives bluish-red (ruby) shades. PR48:2 is distinctly more lightfast (Blue Scale 4-5 vs 3-4 in letterpress proofs), but PR48:1 has better soap and sterilization fastness.
Is Pigment Red 48:1 suitable for offset printing inks?
Yes, printing inks are the main application field for PR48:1. It affords yellowish-red shades with high tinctorial strength, and resinated grades are supplied to enhance print transparency and reduce bronzing. Note that some prints may lack resistance to the DIN 16524 solvent mixture and to clear lacquer coatings.
What is the lightfastness and heat resistance of Pigment Red 48:1?
In plastics, full-shade lightfastness is Blue Scale step 3, dropping to step 1-2 in 1/3 SD. In full-shade paint, lightfastness is Blue Scale step 5-6. Heat resistance is 200-240°C for 5 minutes in 1/3 SD PE with 1% TiO2, and paints withstand 180°C for 10 minutes or 160°C for 30 minutes (Industrial Organic Pigments, 3rd ed.).
Can Pigment Red 48:1 be used in plastic and rubber coloring?
Yes. PR48:1 is recommended especially for LDPE and also colors PE with medium tinctorial strength (0.34% for a 1/3 SD coloration with 1% TiO2). It shows good migration fastness and is stable to blooming in plasticized PVC. Avoid open-steam vulcanization, where the pigment can bleed into the wrapper.
Handling & Storage
Store Pigment Red 48:1 in a cool, dry location away from direct sunlight. Keep containers sealed to prevent moisture absorption. Under proper storage conditions (below 35°C, relative humidity < 70%), shelf life is minimum 3 years from manufacture date. Avoid contact with strong oxidizing agents.
Packaging
Available in 25 kg multi-ply paper bags with polyethylene liner, or 500 kg bulk bags upon request.
Related Products
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- Pigment Red 48:3 HP RED 2348 (strontium-lake PR48:3 red)
- Pigment Red family overview
- Pigment Red 48:2 HP RED 2347 (BBC-type toluidine red)
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