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In cement production, it is essential to add gypsum and originally, natural gypsum has been used for producing cement. Our country has no natural gypsum resource, so from beginning of operation of chemical fertilizer factory in 1960, they produced phosphate resources gypsum from main ingredient.
With these phosphate resources, gypsum industries altered cement material with domestic product instead of importing and also applied to many different fields. Like this, Ulsan Gypsum Factory manufactures refined phosphate gypsum and gypsum plaster, calcined gypsum and gypsum resin mortar etc to supply to many cement manufacturers and construction material demanded places. |
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 Refined Phosphate Gypsum (CaSO4 ? 2H2O+XH2O) |
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1. Chemistry Component |
| Classification |
K-S Standard |
Actual Value |
¨ç SO3 |
Over 38% |
Over 40% |
¨è H2O |
Over 16% |
Over 16% |
¨é P2O5 |
Less than 1.5% |
Less than 1.0% |
¨ê Water Soluble P2O5 |
Less than 0.1% |
Tr |
¨ë H2SO4 |
Less than 0.1% |
Tr |
¨ì CaO |
Less than 40% |
Less than 35% |
¨í PH |
Over 16% |
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| 2. Granularity (2~32mm): over 80% |
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| 3. Role of gypsum in cement |
| 1) Control coagulation of cement (delays coagulation) |
| 2) Promote hardening (Improves strength at the beginning state) |
| 3) Improves resistance to sulphate |
| 4) Decrease of expand, contraction |
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| Use: Cement coagulate delayer |
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| Gypsum Resin Mortar (Plaster) |
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¨ç Size: 20 kg/ sack
¨è Water Mix amount: about 10~11
¨é Construction Able area: 1.8§¸/§® §³(Standard thickness1mm
¨ê Compression strength 7day Mpa (kgf/§²) :over 10(100)
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Characteristic: Superior operation ability, excellent adhesive strength, no shrinking, hear insulation, sound proof and economical
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| Use: all kinds of construction material (hotel, hospital, theaters etc) for interior wall and ceilings and basement |
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Gypsum Resin Mortar (dew condensation prevent)
¨ç Size: 20 kg/ sack
¨è Water Mix amount: about 10~11§¤
¨é Construction Able area: 5.48§¸/§® §³(Standard thickness3mm)
¨ê Compression strength 7day Mpa (kgf/§²) :over 10(100)
¨ëharacteristic: Prevent the moisture penetration
Prevent and control dew condensation with insulation effect (prevent inner temperature drops)
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| Use: Any construction area where possibilities of dew condensation |
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Gypsum Plaster (CaSO4): III type Anhydrite ( ¥âtype
1. Chemical Components
¨ç H2O : Less than 3%
¨è PH : over 10
2. oagulation time: 1~2 hours
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| Use : Building material, fireproof coating |
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Calcined Gypsum (CsSO4): III type Anhydrite ( ¥â type)
1. Chemical Components
¨ç H2O : Less than 3%
¨è PH : less than 6
2. Fineness (100mesh): Pass through over 95%
3. Coagulation time: Within 15 minutes
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| Uses : Fertilizer, special cement additive, other building material |
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