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CYMEL® 325 Resin

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CYMEL® 325 resin is a methylated high imino melamine crosslinker supplied in iso-butanol. It is highly reactive and has a high tendency towards self-condensation providing films with very good hardness, gloss, chemical resistance and outdoor durability. It is suitable for a wide range of solventborne or waterborne baking applications, such as coil and can coating formulations, automotive primers and topcoats, and general industrial coatings.
End Uses: Top Coat, Waterborne Coating, Solventborne Coating, Primer
Compatible Polymers & Resins: Epoxies (EP), Acrylics, Polyesters, Alkyds
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Identification & Functionality

CYMEL® 325 Resin Features & Benefits

Product Highlights


  • Very fast cure response
  • Medium to high solids
  • Low formaldehyde release


  • General industrial coatings
  • Automotive coatings
  • Coil and container coatings

Applications & Uses


Compatible Polymers & Resins
Compatible Substrates & Surfaces
Physical Form
Clear Liquid
Insoluble in
Aliphatic Hydrocarbons
Typical Properties
ValueUnitsTest Method / Conditions
Colormax. 70APHA-
Non-Volatile Content78-82%wt-
Free Formaldehyde Contentmax. 0.75%-
Viscosity (23°C)2500-4500mPa.s-
Solubility & Compatibility


Alcohol Complete
Esters Complete
Ketones Complete
Aromatic hydrocarbons Partial
Aliphatic hydrocarbons Insoluble
Water Partial



Acrylic resins Very good
Alkyd resins Very good
Polyester resins Very good
Epoxy resins Very good

Technical Details & Test Data

Backbone Polymer Selection

CYMEL 325 resin is an effective crosslinker for backbone polymer resins containing hydroxyl, carboxyl, and amide functional groups, such as those found on alkyd, polyester or acrylic resins. Although the optimum level of CYMEL 325 resin should be determined experimentally, ratios of 25 to 35% based on resin solids are typically most effectiveb


CYMEL 325 resin may not require the addition of an acid catalyst to the formulation to obtain effective cure. In many instances, the acidity of the backbone polymer in the formulation is sufficient to catalyze the reaction under normal baking conditions (15-20 minutes at 120-150°C). If catalyst addition is required, then 0.5-1.0% of CYCAT® 296-9 catalyst based on total resin solids is recommended.



The stability of solvent-borne systems containing CYMEL 325 resin can be enhanced by the addition of primary alcohols, amines, or a combination of these. Low molecular weight primary alcohols such as ethanol or n-butanol are most effective. Recommended amines are TEA or DMEA at a concentration of 0.5-1.0% on total binder solids. For best stability in waterborne systems, a pH of 7.5-8.5 should be maintained using tertiary amines only.


CYMEL 325 resin has a shelf life of 720 days from the date of manufacture when stored at temperatures below 32°C. Although low temperatures are not detrimental to stability, its viscosity will increase, possibly making the resin difficult to pump or pour. The viscosity will reduce again on warming, but care should be taken to avoid excessive local heat as this can cause an irreversible increase in viscosity.

Storage & Handling

Shelf Life
720 Days

Most Viewed Documents

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CYMEL® 325 Resin Technical Data Sheet - EN
Technical Data Sheet
CYMEL® 325 Resin
Technical Data Sheet
Products: CYMEL® 325 Resin
CYMEL® 325 Resin Technical Data Sheet - RU
Technical Data Sheet
CYMEL® 325 Resin
Technical Data Sheet
Products: CYMEL® 325 Resin
CYMEL® 325 Resin Technical Data Sheet - ZH
Technical Data Sheet
CYMEL® 325 Resin
Technical Data Sheet
Products: CYMEL® 325 Resin