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Cellulose Derivatives

Weyerhaeuser offers a range of low viscosity Kraft pulps tailored for specific segments of the textile and cellulose derivatives markets. One grade, Peach® 426, is useful in textile applications. Another grade, Pearl® 429, was created with cellulose derivative applications in mind.

Cellulose derivatives are used in various products, including lacquers, paints, inks, and thickening agents. Derivatives such as carboxyl methyl cellulose, methyl cellulose, hydroxylpropyl methyl cellulose, and others can be cost-effectively produced by adding Pearl into the fiber blend.

What is Pearl® 429 Pulp?

Pearl 429 is a reduced-viscosity 100% softwood Kraft pulp. Its increased reactivity (compared to a regular Kraft pulp), cleanliness, and adjustable range of viscosity make this pulp suitable for a wide range of chemical applications.

Typical uses include cellulose esters, carboxyl methyl cellulose, methyl cellulose, hydroxylpropyl methyl cellulose, and hydroxyethyl-cellulose.

View the Material Safety Data Sheets.

The key differences between Pearl 429 and other pulps are:

  • Higher hemicellulose content than dissolving wood pulp (DWP)
  • Slightly lower brightness than DWP
  • Softer sheet than standard Kraft, but harder sheet than DWP

Why is Pearl® 429 valued?

Customers value Pearl 429 because it:

  • Allows them to optimize both their production conditions and product formulations
  • Is offered at a consistent supply quality
  • Can be tailored to suit customer needs; for example, reactivity, viscosity and cleanliness
  • Has controlled low and medium viscosity from elemental chlorine free, bleached Kraft softwood for added flexibility in pulp blending
  • Has higher reactivity for ether formation (compared to standard Kraft paper grade and fluff)
  • Has a better environmental foot print versus DWP
  • Is available in bale or roll form