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LRBG Chemicals USA MUF 400PC

LRBG Chemicals USA MUF 400PC is a light tan, free-flowing melamine-urea resin powder designed as an adhesive for hot-press or high-frequency wood bonding systems. When used correctly, it provides a waterproof bond and meets the requirements of the ANSI/AITC A190.1-1992 Standard for Structural Glued Laminated Timber. This resin is ideal for high-frequency, high-strength gluing of truck flooring, rail decks, and other laminated wood structures due to its fast cure and low arcing. However, LRBG Chemicals USA MUF 400PC is not suitable for cold-cure applications.

Polymer Name: Melamine Urea Formaldehyde

Chemical Family: Melamine Formaldehydes (MF), Melamine Urea Formaldehyde

Compatible Substrates & Surfaces: Wood

Knowde Enhanced TDS

Identification & Functionality

CASE Ingredients Functions
Composite Materials Functions

Features & Benefits

Applications & Uses

Compatible Substrates & Surfaces
General Blend Formula


  • Mechanical Mixer - Medium speed
  • Pail or mixing vessel to blend in
  • Scales to weigh water, catalyst, resin

Ingredients and Proportions by Weight:

MUF-400PC Resin Powder 50 parts 100 lbs.
Water 30 parts 55 - 65 lbs.
  • Weigh up the full water charge. Pour about two thirds of the water into the mixing vessel.
  • Start mixer blade and add all the resin charge to the water in the mixing vessel. Mix until the blend is lump free.
  • Add the last one-third of the water charge to the mixing vessel.
  • Thoroughly mix until lump free.

How much water added depends on the application. In most lamination processes the water used is 55 - 60 lbs to 100 pound resin. The glue solutions’ viscosity and solids give a uniform glue line thickness with proper coverage to avoid glue dry areas on the wood joint. Use of higher amounts of water to thin the glues’ viscosity need to be tested by the user for process efficiency. Water temperature is also important to the glue’s performance. Lower water temperatures will increase the liquid lifetime of the glue but can cause poor glue penetration into the wood and slow cycle curing time. The best temperatures for glue application are 70 - 78°F. Higher temperatures will shorten the glue liquid lifetime and may cause joint failure due to resin precure. Wood temperature also affects the glue’s performance. Cold wood will slow the cure speed and warm wood will make the cure speed faster. Both conditions can lead to glue joint failure. The best conditions are to have the wood at the same room temperature as the glue solution.

Glue spread:

  • For laminated timber, especially truck flooring, enough glue should be applied to give a small bead of squeeze out when the panel is put under pressure. An exception to this would be in radio frequency gluing, where heavier spreads might be needed to raise conductivity and to prevent “dry out” problems.
  • Typically both surfaces of the joint receive a coating of glue. A general rule for the glues’ spread thickness is 12 - 14 mils, using a wet film thickness gage. Excessive glue spreads are wasteful, not very advantageous to the product, and causes addition clean-up problems.

Quality testing instructions:

For the boiling water gel time, viscosity and pot life determinations, in the lab, blend 300 gm. MUF400PC resin powder with 195 gm. water. When the MUF400PC solution is smooth, adjust the solution temperature to 25°C, note time. Then check that the temperature is still 25°C. Start the pot life time. Test the viscosity ten minutes after mixing.


Physical Form
Light tan free flowing powder
Typical Properties
ValueUnitsTest Method / Conditions
Particle Size (Retained on 40 Mesh)max. 1%-
Gel Time (at 100°C)35 - 80sec-
Viscosity (at 25°C)800 - 2500cps-
Pot Life (at 25°C)2.5 - 5.0hours-

Packaging & Availability

Packaging Type
Standard Packaging

The standard package for MUF-400PC fiber drum having a net content of 50 pounds or 25 pounds.

Storage & Handling

Storage Conditions

MUF-400PC is sensitive to heat and humidity and should be stored in a closed container in a cool, dry area. Avoid direct contact with concrete floors. Optimum storage conditions are below 75°F. and below 60% relative humidity.