The recommended use ratio of fluorescent whitening agent is 0.02%-0.05%, that is, 200-500g is added to one ton of material. The proportion and effect of fluorescent whitening agent is sine wave curve. If the proper proportion is reached, the whiteness is the best. If the proportion is too low or too high, the whiteness will be insufficient or darkened and yellowed. Experience is very important with regard to the use ratio of fluorescent whitening agents. The amount of new materials added will be relatively small, and more recycled materials can be added as appropriate. The proportion of different fluorescent whitening agents will be different. Lianda suggests that you can determine it by sample experiment. The key is to find the saturation point. Next, we have collected some usage ratios of conventional whitening agents for your reference.

Use ratio of fluorescent whitening agent OB:

0.01%~0.05% of white PVC and 0.0001%~0.001% of transparent PVC

PS is about 0.001% white and 0.0001%~0.001% transparent.

ABS color: 0.01%~0.05%, white color: 0.01%~0.05%

0.0005%~0.001% for colorless PE and PP 

0.005%~0.05% for white PE and PP.

The above contents are for reference only, and the specific application needs to be tested before deciding. The optimum dosage of fluorescent whitening agent OB depends on its compatibility with polymer. Excessive dosage of whitening agent will cause incompatibility and migration.

Use ratio of fluorescent whitening agent OB-1:

Generally, the amount of white plastic is 0.01%~0.03%, and it can also be made into concentrated color masterbatch with the content of 1%~10%, and then used for product processing according to the addition ratio.

Use ratio of fluorescent whitening agent FP-127:

The white color of PVC is 0.01%~0.05%, and the transparent color is 0.0001%~0.001%

0.001%~0.05% white and 0.0001%~0.001% transparent polystyrene.

When ABS is 0.01%~0.05%, the inherent yellow color of ABS can be eliminated.

Use ratio of fluorescent whitening agent KCB:

In PE, PVC, PS, ABS, EVA foam products, the general dosage is about 0.01%~0.03%, and users can make appropriate adjustments according to product requirements. The dosage of light transparent agricultural film is 0.0005%~0.002%. When any ultraviolet absorber is added to the polymer, the dosage of fluorescent whitening agent should be properly adjusted.

Use ratio of fluorescent whitening agent KSN:

0.002%~0.03% in ordinary plastics; 0.0005-0.002% of transparent plastic; 0.01%~0.02% of polyester resin.