Diisocyanate DI

INV NDI 1,5-naphthalene diisocyanate

chemical components	1,5-naphthalene diisocyanate or naphthalene 1,5-diisocyanate
Molecular Structure
NCO content	40%
molecular weight	210
Theoretical ratio	100g pure polyethylene adipate corresponds to 10.5g NDI (prepolymer-NCO=0)
Exterior	Fine, white or pale yellow to off-white irregular flaky crystals
odor	Special isocyanate smell
purity	≥99.0%
Freezing point	126.5-127℃
Total chlorine content	≤0.1%
Hydrolyzed chlorine content	≤0.03%
density	约0.40g﹒cm^-3
storage	Note that NDI is very sensitive to moisture. Because all diisocyanates can react with water to form insoluble urea derivatives. NDI should be stored tightly closed in cool and dry conditions. After use, it should be sealed immediately to avoid failure. Under suitable external conditions, the product is valid for 6 months.
Package	Standard container: paper drum lined with polyethylene bag, net weight 20kg/drum

Operational safety measures
INV NDI is pure 1,5-naphthalene diisocyanate (NDI), which is a fine, white or pale yellow to off-white irregular flaky crystal. At room temperature, the vapor pressure is below 10-4 mbar. The Federal Republic of Germany stipulates: In the working environment, the NDI content should be less than 0.02ppm (0.18mg/m3) (even if it exceeds the standard for a short time, it is not allowed). Due to the special reactivity, NDI is identified as a dangerous substance and must be handled with care.
The potential hazard of NDI is the formation of dust, vapors and fumes during use.
Operators may be exposed to NDI in the following situations: ① Dust wafted out during weighing or feeding. ②When NDI prepolymer is prepared or poured, steam or smoke generated by excess NDI (smoke will be generated when hot NDI steam condenses).