Engineering plastic help required

PTFE fits the bill in everything other than the SG 2.2g.cm3.

I don't know it's specific gravity but thermosetting polyester is compression molded

to make plates and bowls that are dishwasher safe and microwaveable.

Polycarbonate resin such as CALIBRE 300 series should fit your needs.

How about Polyethylene?

It could be a little close on temperature, but perhaps a HDPE could work?

Suggest you check "Polymers for Engineering Applications"; by Raymond B. Seymour; ASM International. ISBN: 0-87170-247-9. UHMWPE, 38,000 kPa tensile only has a max heat resistance to continuous heat of 80 C. Polypropylene at 34,500 kPa tensile, 48,000 kPa flexural only has a 70 C max resistance to continuous heat. A polyester TPE with 39,000 kPa tensile has 1.25 SpG and a Vicat softening point of 166 C. However, Nylon 66, for example, has a 1.2 SpG and 120 C resistance to continuous heat, with a tensile of 82,750 kPa. Polyimides are even better, but fail the SpG test (1.4). Polyetherimide, for example, has a 1.27 SpG but a 170 C Max resistance to continuous heat. Polyarylates = 150 C max continuous heat resistance and a 1.2 SpG. Unfilled PEEK has a 125 C max continuous heat resiance value at 1.3 SpG. Don't forget one can make polymer blends also.

Thanks guys!!