Furan resins are usually used in heat curing thermosets, either in combination with urea-formaldehyde resin and phenol formaldehyde resins or with furfuryl alcohol.
Application
The principal applications for furan resins are in chemical plants. Specific uses include the
lining of tanks and vats and piping and for alkali-resistant tile cements. The property of
moisture resistance is used when paper honeycomb structures are treated with furan resins
and subsequently retain a good compression strength even after exposure to damp
conditions.
Laminates have been prepared for the manufacture of chemical plants. They have better
heat and chemical resistance than the polyester- epoxy- phenolic- or amino plastic-based
laminates but because of the low viscosity of the resins were not easy to handle. Becausethey were also somewhat brittle, furan-based laminates have been limited in their
applications.
This situation may be expected to change somewhat with the advent of new polymers of
greater viscosity (375–475 cP) (37.5–47.5 N s/m2) and generally easier handling qualities.
Whilst patents (e.g. Ger. Pat. 1927 776) describe polymeric blends of UF and furan resins as
being suitable for such laminating it has been stated that the commercially available
polymers (e.g. Quacorr RP100A—Quaker Oats Co.) are basically furfuryl alcohol polymers
not modified by PF or UF resins. They are cured by modified acid catalysts, giving a rather
more gentle cure than the earlier catalyst systems.
Specifications
| Sr. No. | VIFURAN Resin | Appearance | Gel Time | Viscosity | Solid content | PH | Furfuryal Alcohol | Free Phenol | Free Formaldehyde | Nitrogen Content | Shelf Life | Application |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | VIFURAN 250 | Reddish Purple liquid | > 1800 secs. | 30 - 35 secs. | 50 - 58 % | 6 - 7 | 50% | Nil | < 0.2 % | < 1.5 % | 365 Days | Linning Additive for carbon and Graphite Brick |
| 2 | VIFURAN 252 | Reddish Purple liquid | > 1800 secs. | 16 - 24 secs. | 45 - 62 % | 6.5 - 7.5 | 50% | 0.3 - 0.5 % | 0.7 - 1 % | Nil | 180 Days | Foundry Industries for core making |
| 3 | VIFURAN 254 | Reddish Purple liquid | > 1800 secs. | 15 - 25 secs. | 45 - 60 % | 6 - 7 | 90% | 0.2 - 0.5 % | 0.50% | 0.60% | 180 Days | Foundry Industries for core making |
| 4 | VIFURAN 256 | Reddish Purple liquid | > 1800 secs. | 15 - 20 Secs. | 45 - 60 % | 6 - 7 | 50% | Nil | < 0.5 % | 1% | 180 Days | Foundry Industries for core making |
| 5 | VIFURAN 258 | Reddish Purple liquid | > 1800 secs. | 16 - 22 secs. | 45 - 58 % | 6.5 - 7.5 | 75% | 0.10% | < 0.4 % | 0.10% | 180 Days | Foundry Industries for core making |
| 6 | VIFURAN 260 | Reddish Purple liquid | > 1800 secs. | 15 - 20 secs. | 45 - 54 % | 6 - 7 | 70% | 0.3 - 0.5 % | < 0.4 % | 0.50% | 180 Days | Foundry Industries for core making |
| 7 | VIFURAN 262 | Reddish Purple liquid | > 1800 secs. | 15 - 23 secs. | 45 - 55 % | 6 - 7 | 75% | 0.2 - 0.4 % | < 0.5 % | Nil | 180 Days | Foundry Industries for core making |
| 8 | VIFURAN 264 | Reddish Purple liquid | > 1800 secs. | 15 - 25 secs. | 45 - 56 % | 6.5 - 7.5 | 50% | 0.3 - 0.4 % | < 0.4 % | 1% | 180 Days | Foundry Industries for core making |
| 9 | VIFURAN 266 | Reddish Purple liquid | > 1800 secs. | 16 - 25 secs. | 45 - 55 % | 6 - 7 | 75% | 0.2 - 0.5 % | < 0.3 % | 0.30% | 180 Days | Foundry Industries for core making |
| 10 | VIFURAN 268 | Reddish Purple liquid | > 1800 secs. | 15 - 24 secs. | 45 - 60 % | 6.5 - 7.5 | 70% | 0.3 - 0.5 % | < 0.4 % | 3.50% | 180 Days | Foundry Industries for core making |
| 11 | VIFURAN 270 | Reddish Purple liquid | > 1800 secs. | 16 - 25 secs. | 45 - 58 % | 6 - 7 | 40% | 0.2 - 0.5 % | < 0.5 % | Nil | 180 Days | Foundry Industries for core making |
| 12 | VIFURAN 272 | Reddish Purple liquid | > 1800 secs. | 15 - 25 secs. | 45 - 56 % | 6 - 7 | 50% | 0.2 - 0.5 % | < 0.4 % | 0.30% | 180 Days | Foundry Industries for core making |
| VICATLYST | ||
|---|---|---|
| Sr. No. | Grade | Characteristic |
| 1 | VICATLYST 401 | Fast Setting |
| 2 | VICATLYST 403 | Medium setting |
| 3 | VICATLYST 405 | Slow Setting |