Feature: Hot-box process to make core is a process that add sand, liquid thermoset hot-box furan resin and catalyst together to make core, then shoot into a hot box which is heated to a certain temperature to heated the sand adhered on the surface of hot box. The hot box furan resin cans harden in a short time via polycondensation. What’s more, once the surface of sand core has several millimeters hardening, the operator can take it out of the hot box as the core part can self harden by the waste heat and the heat produced by hardening. The hot box process offer a effective methods to produce small and medium size sand core (the sand core wall thickness always is 50-75mm), especially for car and familiar industry.

Hot-box furan resin compare with other shell core making:

    1. The hot-box furan resin has higher productivity that the speed of making sand core can from several seconds to tens of seconds;
    2. The cost of hot-box furan resin is lower than other resin;
    3. The machine for mixing sand is sample that just needs small investment;
    4. The hot-box furan resin is a environment friendly product has less smell;
    5. The hot-box furan resin also has strength high-temperature resistance.

Common type and main technical index of hot-box furan resin:

Index       Model	Nitrogen content（%）	Free formaldehyde (%)	PH	Viscosity（25°C mpa. s）	Specific gravity (g/cm3)	Recommend applications
HFR602	16.8-17.8	≤1.5	7.0-8.0	300-400	1.20-1.30	Non-ferrous metal castings, brass faucet casting
HFR502	5.0-8.0	≤1.5	7.0-8.0	100-200	1.20-1.30	grey iron and ductile iron metal castings
HFR302	0-1.0	≤1.5	7.0-8.0	40-100	1.20-1.30	small steel casting, high class ductile iron castings

Use parameters:

Sand: resin: curing agent = 100 (1.5-2.0): (0.25-0.3) (weight ratio)
Considerations:
    1. You had better add curing agent first, then adding hot-box furan resin when Mixing sand.
    2. To harden hot box furan resin by using matching with the special curing agent produced by our company can get better effect.
    3. The hot box furan resin should be stored in a cool place, preventing heat and exposure
    4. Sand mixing place should maintain good ventilation.
    5. Mixing sand to prevent air dried and consumed as soon as possible, generally not more than 4 hours.
Quality guarantee period: 12 months
Sand mixing technology reference:
    1）Batch sand mixer: join the measured base sand first, addition of curing agent mix for 1 minutes, then mix with hot-box furan resin mix for 2 minutes, resin sand mixed in a certain amount of air pressure into the core-box
    2）Roll wheel sand mixer: join the measured base sand first, addition of curing agent mix for 2 minutes, then mix with resin mix for 2 minutes, hot-box furan resin sand mixed in a certain amount of air pressure into the core-box
    3）Core making, core shooting air pressure: 2-5kg/cm².
    4）Hardening temperature and time: temperature ：220~280℃. Time (depending on the size of sand cores)

Package: