Melting point :220 °C
Boiling point :211.9°C (rough estimate)
Density :1.084 g/mL at 25 °C(lit.)
Tg :62.5
refractive index :1.542
form :pellets
Merck :13,6768
Dielectric constant :2.0（Ambient）
Stability :Stable. Incompatible with strong acids.
IARC :3 (Vol. 19, Sup 7) 1987
EPA Substance Registry System :Polycaprolactam (25038-54-4)

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
Precautionary statements:	P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P280 Wear protective gloves/protective clothing/eye protection/face protection. P302+P352 IF ON SKIN: wash with plenty of soap and water. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P321 Specific treatment (see … on this label). P332+P313 IF SKIN irritation occurs: Get medical advice/attention. P362 Take off contaminated clothing and wash before reuse.