Textile Chemical Auxiliary Optical Brightener 4bk Agent for Cotton

1. It has high-efficiency fluorescent whitening effect, strongwhiteness enhancement, bright and bright color (slightlypurple and blue light)2. Not sensitive to light and stable in chemical properties.

1. It has high-efficiency fluorescent whitening effect, strong
whiteness enhancement, bright and bright color (slightly
purple and blue light)
2. Not sensitive to light and stable in chemical properties.
3. It is resistant to weak acids, alkalis, hydrogen peroxide
and perborate, suitable for alkaline oxygen-bath processing
technology, and also suitable for pad dyeing process
4. Excellent washing resistanc


  Optical Brightening agent / Optical Brightener 4BK  
 Optical Brightener 4BK   C.I. 113Structure: Stilbene bistriazine derivativeMoisture: 5%max
Appearance: Slight yellow uniform  powderShade:Slight bluish
Strength: 100±3%Fineness(120 meshes residue): 5%max
ApplicationMainly be used in whitening of cotton fabric and polyester /cotton blends.T/C whitening in one bath.
Porperty1.With strong fluorescence, excellent whitening effect and slight bluish shade
2.With high light resistance and chemical stability.
3.Good acid resistance, stable in perborate and hydrogen peroxide.
PrecautionThe information of our products is for reference only. We are not responsible for any unexpected results or patent dispute caused by it

For whitening of cotton and cotton/polyester fabrics.

Exhaust dyeing method 
Rate of use: 0.1-0.8%(o.w.f), bath ratio: 1:10-30
Process: 90-100°C×30-40min→wash→bake.
One-bath method 
Rate of use: 0.2-0.8%(o.w.f), hydrogen peroxide: 5-15g/L
Bleaching assistant: 0.5-2g/L, NaOH: 1-5g/L
Scouring agent:0.5-1g/L, bath ratio: 1:10-30
Process: 90-100°C×30-40min→wash→bake.

1. One-stop service, track logistics information 18 hours a day.

2. Short delivery time: 3-7 days after delivery.

3. Payment : T/T, Paypal, Western Union,Alibaba Credit Insurance Order

4. Transportation mode: shipping, air transportation, express delivery and other ways you can choose. The professional team recommends the most cost-effective transportation mode for you.

5. Provide free samples, you can take the sample first and then make the purchase decision.

6. Low MOQ

1.It's our first business, how do I ensure your quality ?
1st confirmation: Credit will send you free samples and good quality speaks for itself!

2nd confirmation: Before the bulk order, we can provide pre-production samples according to your demands. During production, you are welcome to check by video at any time, or a third-party inspection agency to inspect the goods before shipment.

3rd confirmation : If there is indeed a normal defective rate of product after our successful cooperation, we will arrange the same amount of high quality products to try our best to reduce your money loss and deadline risk.

2.Is there a MOQ?
No moq, but In order to save your precious time and energy, and considering the opportunity cost of our factory, we do not
recommend the small batch cooperation model, but we will provide you with the most suitable solutions with the right number according to your actual requirements and our factory real situation. The Win-Win Cooperation is the ultimate goal of Credit!

3.Can I get free samples?
We can send free samples.

4.How long will I receive the quotation?
For most items, once we know the size ,the material,the package way and quantity, we will provide you with a quotation within 8 hours.

5.Can I customize the design?
It is highly appreciated that you can provide us with detailed designs and your business ideas. We design and build each project according to the needs of individual customers, so as to establish a Long-Term Cooperative partnership. We focus on creating high-quality innovative and environmentally responsible designs for you to highlight the advantages of your products.

6.Can I send an inquiry and get the solution today?
If you send email, WhatsApp, WeChat to contact us, we promise to reply to you within 8 hours! WhatsApp is the best because we all 18 hours online :)