IW-200 Urea Formaldehyde Resin

IW-200 Urea Formaldehyde Resin is a liquid-state thermosetting Urea Formaldehyde Resin (UFR) which meets all the requirements of a Type II Adhesive. The resin is best suited for manufacturers capable of storing and handling bulk type shipments.

This product is recommended for manufacture of plywood, particle board, Medium Density Fiberboard (MDF), and other wood works especially products for interior use. This resin produces a glue bond which is stronger than the wood strength itself.

TECHNICAL SPECIFICATIONS

   *Note: Specifications can also be adjusted upon customer request. 


 

STANDARDS

IW-200 Urea Formaldehyde Resin complies to the following international standards;

 UK standard
 : BS-1455 types MR and INT 
 USA standard
 : C-35-36 types II and III
 German standard 
 : DIN 1-74 PS 51-71 INT GRD 
 Japan standard
 : JPIC types II and III

 

SUITABLE HARDENER

For hardener we recommend using IWH-200, a hot bonding hardener suitable for IW-200 Urea Formaldehyde Resin usage. It is yellow powder packed in 25 kg bags. If stored in a cool and dry place, the IWH-200 hardener can last for a minimum of one year.

 

RECOMMENDED MIXING FORMULATION

The following mixing formulation is recommended so the IW-200 Urea Formaldehyde Resin achieve its best performance.

 IW-200 Urea Formaldehyde Resin 
 : 100 parts by weight 
 Industrial grade wheat flour as filler 
 : 10-20 parts by weight 
 IWH-200 hardener
 : 0.5-1.0 part by weight 
 Water : 2-6 parts by weight
 

MIXING PROCEDURE

Mixing procedure for IW-200 Urea Formaldehyde Resin differ on the speed of the stirrer:

For High Speed Stirrer

Pour in all of the IW-200 Urea Formaldehyde Resin and wheat flour, and mix them for about 5 minutes. Next, add the IWH-200 hardener, followed by water. Prior to use, stir for a further 10-15 minutes to ensure the mixture is well-mixed.

For Low Speed Stirrer

Pour in half of the IW-200 Urea Formaldehyde Resin and all of the wheat flour, and mix them for about 5 minutes. Next, pour the remaining IW-200 Urea Formaldehyde Resin and all of the IWH-200 hardener, and finally add water. Before usage, stir for 10-15 minutes more to mix it better.

 

POT LIFE OF THE RECOMMENDED GLUE MIX

The above recommended formulation will have a pot life varying according to environment or room temperature, as follows;

 Room temperature 
 20°C  25°C  30°C 
 35°C 
 Gel time / pot life (hours) 
 14 10 8 4

 

VENEER PREPARATION

Before assembly, veneer faces must be cleaned to be smooth and free of dust, glue stains, etc. The veneers must be uniform in thickness. Moisture content of the veneers must be maintained at about 8-12% for face and back veneers, and at about 8-16% for inner cores. High moisture content will increase the risk of getting punks (rejects) because it will need higher pressing temperature.

 

GLUE SPREAD

Glue spreading should use double glue line, using about 30-36 g/sqft of glue mix, to be adjusted according to veneer quality. Thicker veneers require more glue spread amount due to having rough faces. "High density wood" must have about 10% increased glue spread amount than "low density wood" (meranti wood).

 

PRE-PRESSURE

Lay up time is required in pre-press to transfer glue mix from spread core to veneer for suitable penetration. It is important to avoid early curing, for example too low glue spread for low moisture content, especially in hot and dry climate condition. The pressure on cold press must be lower than that of hot press. Suitable pressure is thus determined by working conditions, although good results are usually obtained at about 9-10 kg/cm2. Cold press time also depends on operating conditions, normally 15-25 minutes.

 

PANEL ASSEMBLY TIME

The assembly time must generally be as short as possible, and the glue mix must still be viscous when pressing is performed. Although the glue is rather dry, when it is bonded at 110oC, it can achieve good adhesion if the pressure and pressing time are increased.

 

HOT PRESS TIME

Basic setting time for the above recommended glue mix formulation varies depending on the press temperature, as follows;

 Press temperature
 90°C 
 100°C 
 110°C 
 115°C 
 Basic setting time 
 1.75 minutes
 1.50 minutes
 1.00 minutes
 0.85 minutes

To have enough time for heat transfer, it becomes necessary to add additional time to the basic setting time above. The amount of additional time varies depending on the distance from the press plate to the Farthest Glue Line (FGL). That additional time (minutes/mm) according to the FGL is as follows;

 Distance to FGL 
 Press plate temperature 
 30°C 
 30°C 
 30°C 
 30°C 
 Below 5 mm
 1.1 1.0 0.9 0.85
 5-10 mm
 1.3 1.2 1.1 1.0
 Over 10 mm
 1.5 1.4
 1.3 1.2

Example 1: a 3-ply panel of 2.5 mm core and 1.0 mm face and back veneers. The required press time at 110°C is as follows;

 Heat transfer time 
= 1.0 mm x 0.9 minute/mm =
 0.9 minute
 Basic setting time
 = 1.0 minute +
 Total pressing time 
 = 1.9 minutes

Example 2 : a 7-ply panel of 2.5 mm inner cores and 1.0 mm face and back veneers. The required press time at 110°C is as follows;

 Distance to FGL 
 =(1.0 + 2.5 + 2.5) mm =
 6.0 mm
 In that case,
   
 Heat transfer time 
 = 6.0 mm x 1.1 minute/mm =
 6.6 minutes
 Basic setting time
 =
 1.0 minute +
 Total pressing time 
 =
 7.6 minutes 

Note: Heat transfer speed will depend also on the wood species and moisture content. Therefore the table above is only a general indication for the required additional time.

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