Rosin derivative

Pentalyn FC

Pentalyn FC resin is the pentaerythritol ester of maleic-modified wood rosin. It is a pale, high softening point, high acid number, thermoplastic resin.

Key properties

Pentalyn FC is highly soluble in typical organic solvents as well as in dilute aqueous solutions of alkalies, including ammonia.

It is particularly suitable for modifying compositions based on alcohol-soluble and water-soluble film formers, to which it contributes high gloss, block resistance, fast solvent release, and good adhesion.


Pentalyn FC modified rosin ester, an improved solubility version of Pentalyn 856 resin, meets the US FDA regulation for coatings on fresh citrus fruit.

  • Component of post-harvest coatings for fresh fruit
  • Gloss and adhesion promoter in flexographic printing ink vehicles
  • Used in formulations of water based inks
  • Used in formulations of paper coatings, adhesives, wax emulsions, and water-reducible paints
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  • High softening point
  • High acid functionality
  • Alcohol and aqueous alkali soluble
  • Promotes high gloss and hardness

  • Fast solvent release
  • Good adhesion
  • Nonblocking characteristics to inks and coatings

Softening point, Pinova drop method, °C


Color, USDA rosin scale, maximum


Acid number


Softening point, Pinova drop method, °C


Color, USDA rosin scale


Acid number


Density at 25 °C, lbs (kg/l)

9.1 (1,09)


Bag, multiwall, kraft



Net weight

50 lbs, 22.68 kg




Not regulated


21 CFR 172.210

21 CFR 176.210


21 CFR 175.105
21 CFR 175.125
21 CFR 175.300
21 CFR 175.320
21 CFR 175.390
21 CFR 176.170
21 CFR 176.180
21 CFR 176.200

21 CFR 177.1200
21 CFR 177.1210
21 CFR 177.1400
21 CFR 177.2600
21 CFR 178.3120
21 CFR 178.3800
21 CFR 178.3850
21 CFR 178.3870

Pastillated or flaked resins may fuse, block, or lump during hot weather months, if stored near sources of heat, if double or triple stacked, or if stored for prolonged periods of time.

These forms of resins are prone to gradual oxidation, some more so than others. This could result in darkening and/or could have an adverse effect on solubility in organic solvents.

Care should be taken to minimize opportunities for product oxidation throughout processing.

Accordingly, it is strongly recommended that proper storage conditions and strict control of inventory be observed at all times, taking care that the oldest material is used first.