Phenol Formaldehyde Resin Powder with Medium Flow for Grinding Wheels

Product description

Phenol Formaldehyde Resin F3620-2 is produced by condensing a molar excess of phenol to formaldehyde  in the presence of an acid catalyst. This produces a thermoplastic resin. To cure this resin, a hardening agent is used, HMTA (or hexa). Under heat and pressure, it yields ammonia and formaldehyde as methylene groups to cure the resin, hence the term “two-step,” because of the two formaldehyde additions. A novolak phenolic resin has an infinite shelf life under normal storage conditions.Cured phenolic resin provides the rigidity necessary to maintain structural integrity and dimensional stability even under severe conditions.

Characteristics

1. Bonding Strength

The primary use of phenolic resin is as a bonding agent. Phenolic resin effortlessly penetrates and adheres to the structure of many organic and inorganic fillers and reinforcements, which makes it an ideal candidate for various end uses.

2. High Temperature Performance

A key characteristic of thermoset phenolic resin is its ability to withstand high temperature under mechanical load with minimal deformation or creep. In other words, cured phenolic resin provides the rigidity necessary to maintain structural integrity and dimensional stability even under severe conditions.

3. Chemical Resistance

Phenolic resins accommodate the harsh exposure of severe chemical environments. The inherent nature of

phenolic resin provides an impervious shield to protect a variety of substrates from the corrosive effects of

chemicals. Laboratory tests confirm minimal degradation from many chemicals after prolonged exposure,

often at elevated temperatures.

4. Low Smoke and Toxicity

Burning phenolic resin typically generates hydrogen, hydrocarbons, water vapor, and carbon dioxide. Phenolic resin produces a relatively low amount of smoke at a relatively low level of toxicity.

5 .High Carbon and Char Yield

Phenolic resins demonstrate higher char yields than other plastic materials when exposed to temperatures

above their point of decomposition. In an inert atmosphere at high temperatures (600° - 2,000°F, 300 -

1,000°C), phenolic resin will convert to a structural carbon known as vitreous carbon. In many ways, this

material behaves similar to ceramic and may actually contribute to structural integrity when exposed to fire

situations.

Application

Phenol Formaldehyde Resin F3620-2 is recommended for Grinding Wheels.

Powdered resin is used as the principal resin binder for grinding wheels.Powdered phenolic resin affects the degree of wetting during mixing, the strength after molding, the flow and the degree of cross-link density at curing, and helps determine abrasive properties, strength, and heat resistance.The performance of powdered phenolic resin is roughly determined by the molecular weight, which directly influences flow, hexamine content, and particlesize . The wide range of powdered phenolic resins available can produce an equally wide range of grinding wheels and customer needs.

Specification:

Packing&Storage

the package is paper-plastics bag in 25KGS each one
The storage life of this product is several months in a cool and dry place in original closed bags