Optical Brighteners OB-1 & FP-127

Product Overview

Premium Optical Brighteners

We offer two industry-leading optical brighteners: OB-1 (C.I. 393) - the highest melting point brightener with exceptional heat stability, and FP-127 (C.I. 378) - superior whiteness for PVC applications. Both deliver outstanding fluorescent whitening performance across multiple substrates.

UV Active

Absorbs UV and emits visible blue light

High Solubility

Excellent dispersion in various media

Heat Stable

Withstands high processing temperatures

Multi-Substrate

Works on plastics, textiles, paper & more

Optical Brightener OB-1

C.I. 393 | CAS No. 1533-45-5 | The most widely applicable and highest selling optical brightener globally

Also Known As

Fluorescent Brightener OB-1

Optical Brightener OB-1 has the highest melting point among all optical brighteners (357-359°C), making it ideal for high-temperature plastic processing. It is the most widely applicable and most sold brightener worldwide, produced exclusively in China and used globally in plastics and masterbatch production.

Chemical Name	2,2'-(4,4'-diphenol vinyl) dibenzoxazol
CAS No.	1533-45-5
C.I. No.	393
Molecular Formula	C28H18N2O2
Molecular Weight	414
Appearance	Yellowish green powder
Melting Point	357-359°C
Purity	≥98.5%

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Recommended Dosage

Standard: 200-500g per 1000kg material

Transparent Plastic: 0.0001%-0.001%

White Plastic: 0.05%-0.1%

Paint & Ink: 0.02%-0.05%

Key Applications

PVC Products Polyester Fiber Plastic Woven Bags Recycled PET Refrigerator Parts PVC Profiles Masterbatches Compound Plastics

Category 02

Optical Brightener FP-127

C.I. 378 | CAS No. 40470-68-6 | Superior whiteness for PVC applications

Also Known As

Fluorescent Brightener FP-127

Optical Brightener FP-127 (also called CBS-127, Uvitex FP, Hostalux FP-127) is specifically designed for white PVC products. While OB-1 offers better weather resistance, FP-127 provides superior whiteness, making it the preferred choice for PVC foam boards, sheets, pipes, profiles, and cast films.

CAS No.	40470-68-6
C.I. No.	378
Other Names	Uvitex FP, OBA 378, FBA378, Hostalux FP-127, CBS-127
Primary Use	White PVC Products
Key Advantage	Better whiteness than OB-1
Weather Resistance	Good (OB-1 is superior)

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Primary PVC Applications

PVC Foam Board PVC Sheets PVC Pipe PVC Profile PVC Cast Film PVC Flooring PVC Ceiling PVC Wall Panels

Applications

Industry Applications

Our optical brighteners serve diverse industries worldwide

PVC Industry

Foam boards, sheets, pipes, profiles, cast films

Plastics

PP, PE, PET, ABS, PS, engineering plastics

Recycled Materials

Recycled PET, recycled plastics enhancement

Textiles

Polyester fibers, synthetic fabrics

Coatings

Paints, inks, varnishes, coatings

Paper

Paper manufacturing, paper coatings

Packaging

Plastic bags, woven bags, packaging films

Appliances

Refrigerator parts, home appliances

FAQ

Product Questions

Common questions about our optical brighteners OB-1 and FP-127

What is the difference between OB-1 and FP-127?

OB-1 (C.I. 393) has the highest melting point (357-359°C) and better weather resistance, making it ideal for high-temperature processing and outdoor applications. FP-127 (C.I. 378) provides superior whiteness and is specifically designed for white PVC products. Choose OB-1 for general plastics and polyester; choose FP-127 for maximum whiteness in PVC applications.

Which grade should I use for PVC products?

For white PVC products like foam boards, sheets, pipes, and profiles, we recommend FP-127 for superior whiteness. However, if your PVC product requires outdoor use or needs better weather resistance, OB-1 would be the better choice despite slightly lower whiteness.

What is the recommended dosage for plastics?

For transparent plastics, use 0.0001%-0.001%. For white plastics, use 0.05%-0.1%. The standard recommendation is 200-500g per 1000kg of material. However, we strongly recommend testing samples to determine the optimal dosage for your specific application.

Can OB-1 be used for recycled PET?

Yes, OB-1 is excellent for recycled PET applications. Its high heat stability (357-359°C melting point) makes it perfect for the high-temperature processing required for recycled PET. It's widely used in Korea, Pakistan, and other markets for recycled PET enhancement.

What packaging options are available?

Both OB-1 and FP-127 are available in 10kg and 25kg fiber drums. We offer palletized shipping with 450kg, 500kg, or 675kg per pallet for efficient bulk transportation.

Do you provide samples for testing?

Yes, we provide samples for testing before bulk orders. This allows you to determine the optimal dosage and achieve your desired whitening effect. Contact us via WhatsApp or email to request samples.

Which markets do you supply to?

We supply globally including East Asia (South Korea), Southeast Asia (Vietnam, Thailand, Philippines, Indonesia), South Asia (India, Pakistan, Bangladesh), Central Asia, West Asia (UAE, Saudi Arabia, Turkey), Europe (Germany, Italy, Russia), Africa (South Africa, Egypt, Algeria), and Americas (USA, Brazil, Mexico, Canada).