UFORES 201 P

                                       Urea Formaldehyde Powder Resin

Ufores 201 P is a powder Urea Formaldehyde resin, which must be dissolved in water prior to use. When used with the hardener, it provides an excellent adhesive for plywood gluing.

Specifications (Typical) :

Dissolving the Resin :
Prior to use, the resin is mixed with water to convert into solution. A mechanical stirrer may be used for this purpose. With high speed mixer all the water may be placed first and then resin may be added, while mixer is running.

If low speed mixer is used, it is better to make a homogenous mix of the resin with about 2/3 of water, and rest of the water may be added later.

The temperature  of the water may be 20-30° C, because with lower water temperature, mixing is more time consuming. Reconstitution can be carried out in simple mixing equipment as follows:

1.   Take all the water in the mixer. The water temperature should not be below 20° C.

2.   Add required amount of Ufores 201 P and mix until a homogenous solution is obtained.

3.   Once a homogenous solution has been obtained, other additives and hardener are added.

Choice of Reactivity :
The choice of reactivity would normally depend upon the local conditions. The reactivity of the glue can be adjusted over a wide range by varying the composition and amount of hardener. The reactivity of the glue is expressed in terms of gelation time at 100° C.

1. Typical Glue Formulations:

a.

The pot life of the glue mix at 30° is about 8 hours and gel time at 100° C would be about 2 minutes.

The above formulation would meet with the requirements of B.S. 6566 for MR grade.

b.

The gel time of the above glue mix at 100° C would be 40 seconds. While, pot life can be adjusted to the desired level by addition of retarders like Ammonia or Hexamine.

The glue mix would meet with the requirements of B.S. 6566 for INT grade.

Pressing Conditions:
The pressing time would depend upon the press temperature, glue mix reactivity, wood density, veneer thickness and moisture content of the veneers. The temperature for good glue setting normally varies between 90 - 120° C. Pressure would depend upon the wood quality, being higher for hard wood species as compared to soft wood.

Glue Consumption:
The glue is spread to one surface. The veneer surface should be clean and free from dust and other contamination. The consumption of glue generally would be 140 - 200 gms per square meter.

Cleaning:
The equipment can be cleaned with warm water and this should be done before the glue has completely cured.

Handling:
Like any formaldehyde product, Ufores 201 P contains free formaldehyde. This may cause dermatitis, when it comes into contact with skin of sensitive persons. Skin contact with powder or liquid resin should be avoided. Hands should be thoroughly washed with soap and hot water at the end of the working day and before meals. A dust mask should be worn, while emptying the bags.

Storage:
The powdered resign should be stored in the original bags in a cool place protected from heat. Care should be taken that powder does not absorb moisture and water. The bags, which have been opened, should be carefully closed before storage. When stored in original bags at 20°C, shelf life would not be less than one year.

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