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LRBG Chemicals USA MF 829

LRBG Chemicals USA MF 829 is a melamine formaldehyde resin in powder form designed specifically for the production of NEMA Grade G-9 glass fiber laminates. It is a slightly plasticized resin that does not contain any reaction catalyst ions to carry electrical charges. This resin is used in glass fabric laminates that require NEMA Grade 9 electrical performance.

Polymer Name: Melamine Formaldehyde (MF)

Knowde Enhanced TDS

Identification & Functionality

Composite Materials Functions

Features & Benefits

Materials Features

Applications & Uses

Processing Information

MF829 is specifically designed for industrial applications such as NEMA G-9 grade glass fabric laminates. Typical laminate properties are listed on the next page. MF829 has been developed to provide a melamine laminating resin with excellent solution stability at high concentrations of resin solids. This lends itself to treating applications requiring solutions solids of over 60% in order to obtain resin pick-up in the range of 40% in one pass. Based upon field experience with fabrics having an sI516 and 616 finishes, the following recommendations are offered as a guide.

  • Treating solution: Optimum resin pick-up and wetting of glass fabric may be obtained with a 66% solids solution by weight of 829 in a solvent system of about 93/7 water/butanol. MF829 is readily solvated in a mixture of tepid water and butanol with 20 - 30 minutes vigorous agitation. Equipment clean up is facilitated by using a solution of approximately one gallon butanol to ten gallons tepid water. Following a wash down with this mixture, a tepid water flush should complete the clean-up.
  • Treating specifications: A resin content in the range of 39 - 42% with a volatile content of 1.3 - 1.8% (ten minutes at 160°C) is recommended. Flow values obtained on 8 ply of 4” X 4” squares pressed at 300°F and 1,000psi for 5 minutes should fall in the range of 8 - 12%.
  • Cure conditions: The cure cycle will be governed by the laminate thickness. For laminates of 1/16” and 1/8” thickness, a cure time of 15 - 18 minutes at 320°F and 1,000-2,0000 psi is recommended. For laminates of ½” thickness, a cure of 18-20 minutes at 310°-315°F and 1,000-2,0000 psi is recommended. Temperatures recommended are laminated temperatures.


Physical Form
White free flowing powder
Typical Properties
ValueUnitsTest Method / Conditions
Particle Size (Retained on 40 Mesh)Trace%BTM-610B
Water Titer5 - 11mlTM-633
Dilutability24 - 33%TM-633
pH9.0 - 9.9-TM-600
Laminate properties
ValueUnitsTest Method / Conditions
Flexural (Cond. A, MD)75000.0psi-
Flexural (Cond. A, CD)59000.0psi-
Impact (MD)19.0ft. lbs./ in.-
Impact (CD)15.0ft. lbs./ in.-
Bond Strength (1/2”)2000.0lbs.-
Water Absorption0.22%-
Dielectric Breakdown65.0KVD336/50
Dielectric Constant6.3-D48/50
Powder Factor0.018--
Volume Resistivity5 x 10⁶MΩ.cmC96/35/90
Surface Resistance1 x 10⁶MegohmsC96/35/90
Arc Resistance (D48/50)184.0sec-

Regulatory & Compliance

Quality Standards

Packaging & Availability

Packaging Type
Standard Packaging

The standard package for MF829 is a multi-wall paper bag having a net content of 50 lbs. or packaged in a large tote bags at 500 lbs.

Storage & Handling

Storage Conditions

MF829 is a stable material which is not inclined to change provided it is stored in closed containers in a cool, dry area. Avoid direct contact with concrete floors and walls. Optimum storage conditions are below 75°F and 60% relative humidity.