Polymer melt density

Hello,

I will be thankful to you if density values of following polymer melt at around 285 deg C are provided. These polymers are used in man made fibers/filaments mfg.

1. Polyester yarns - PET polymer melt at 285 deg C.

2. Polypropelene - PP polymer melt at 280 deg C

3. Nylon6 - polymer melt at 285 deg C.

Density in kg/ cubic meter or equivelent units.

I have searched google, wikipidia and was really lost in the deep woods of web.

Help provided will be greatly appreciated.