UFORES 301 P
UREA FORMALDEHYDE POWDER RESIN

Powder adhesives for wood products

For Manufacturing Chip / MDF Boards

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Dissolving the Resin:

The resin is mixed with water to convert into solution. A mechanical stirrer may be needed for this purpose. With low speed mixer, it is better to make a homogenous mix of the resin with about 1/2 the amount of water, the rest may be added later under agitation.

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Reactivity:

The choice of reactivity would normally depend upon the local conditions. Important parameters are platen temperature, moisture content of the mat, pressing cycle etc. The reactivity of the glue can be adjusted over a wide range by varying the composition and amount of hardener system. The reactivity of the glue is expressed in terms of gelation time at 100^oC. A commonly used method for determining the reactivity is to measure gel time of resin at 100^oC with addition of Ammonium Salt such as Ammonium Chloride or Ammonium Sulphate.

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Glue Mix Preparation (Typical):

For outer layers of three-layer particleboard, the amount of hardener may be reduced or its addition totally avoided. The risk of pre curing can be reduced by retarding the reactivity of glue by addition of Ammonia or
Hexamine

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Paraffin Emulsion:

Wax emulsion is generally used at a dosage level of 0.5 - 1% solids on dry wood weight, separately or in combination with resin solution. This is needed to reduce the thickness swelling of the finished board.

Resin Consumption:

The quantity of resin to be used is expressed as weight of solid resin calculated on dry chips or fiber. The normal consumption of resin generally varies between 9 - 12%. The consumption of resin would depend on the quality of feed stock also, the important parameters, being porosity, bark and dust content.

Pressing Conditions:

For pressing boards using ufores 301 P, the press temperature varies between 150 - 200^oC. The pressing time would depend on pressing temperature, glue reactivity and moisture content. The usual pressing time may be 12 - 18 sec/mm of board thickness.

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Cleaning:

The equipment can be cleaned with warm water and this should be done before the glue is fully set. Once the glue is hardened, It is insoluble and must be scraped off..

Handling:

Like any formaldehyde product, Ufores 301 P contains free formaldehyde. This may cause dermatitis, when it comes into contact with skin of sensitive persons. Skin contact with solid 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 resin 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^oC, shelf life would not be less than one year.

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© Saudi Formaldehyde Chemical Company Ltd. 1999

Information on this site is of the best of our knowledge. However, since conditions under which our products may be used are beyond our control, recommendations are made without warranty or guarantee.