RCT's White R Liquid is a high‑concentration optical brightener specifically formulated for polyester and polyester‑rich blends, delivering a brilliant reddish-white, bluish‑white and neutral-whiteeffect at very low dosages compared to traditional systems. Its fine, nano‑level dispersion allows typical use levels as low as 20–50 grams per 100 kg of goods, versus 200–500 grams for many conventional brighteners, helping to reduce both chemical load and overall process cost.
RCT White R Liquid overview
Appearance: Greenish‑yellow clear to slightly hazy liquid.
Ionic character: Nonionic / slightly anionic (compatible with most polyester auxiliaries).
Solubility: Easily dilutable with water; miscible in all proportions.
pH (1% solution): Approximately 4.5 – 5.5.
Stability: Good resistance to acids, moderate alkali, high temperature (up to typical polyester dyeing conditions) and common dyeing auxiliaries.
Storage: Store in a cool, dry, shaded place; keep containers tightly closed for optimum shelf life.
High‑Temperature (CI 199)
For high‑temperature applications such as HT jet dyeing and other standard polyester processes, the product is supplied based on CI Fluorescent Brightener 199, giving excellent whiteness and fastness at typical polyester dyeing temperatures.
Low‑Temperature (CI 199:1)
For low‑temperature or more sensitive processing conditions, a dedicated variant based on CI Fluorescent Brightener 199:1 is offered, allowing effective brightening where reduced temperature profiles.
Within both families, concentrations can be customised according to your requirement so you can choose a strength level that best balances whiteness, dosage (gm/100 kg goods), and overall cost for your particular machines, recipes, and markets.
Expected performance
Whiteness: High CIE whiteness on well‑prepared polyester fabrics and yarns, suitable for both domestic and export quality requirements.
Light fastness: Good resistance to light under normal use conditions when correctly applied.
Washing fastness: Stable whiteness after domestic and industrial laundering within recommended temperature ranges.
Sublimation fastness: Very good behaviour under typical heat‑setting and thermosol conditions, with minimal shade change.
Process robustness: Designed to perform consistently across different machines and liquor ratios when basic process parameters are controlled.
Knowledge centre
How optical brighteners help polyester look whiter?
Optical brighteners are special fluorescent compounds that absorb invisible ultraviolet light and re‑emit it as visible blue light, making polyester appear brighter and less yellow to the human eye. On well‑prepared polyester fabrics, the right brightener, dosage, pH, and temperature can give a cleaner, cooler white compared to using peroxide bleaching alone.
What affects whiteness on polyester?
Optical brighteners for polyester work by absorbing invisible ultraviolet light and re‑emitting it as visible blue light, shifting the fabric appearance towards a cooler, cleaner white. The final whiteness is influenced by fabric preparation (peroxide bleaching quality), pH (typically 4.5–5.5 is ideal), temperature profile, application time, dosage, and the presence of other auxiliaries in the bath.
Common issues and solutions:
Get the right White R variant for your process
Every dye‑house runs with different machines, liquor ratios, and temperature profiles, so selecting the correct combination of CI 199 or CI 199:1 base and concentration level is critical. Share your fabric type, process (high‑temperature or low‑temperature), and target whiteness, and Riki Chem Tech will help you choose the most suitable White R Liquid variant and concentration.