Depth Limit

Temperature Range

U

(m)

(^oC)

(W/m²/K)

Anti-corrosion

Polyethylene

>1,000 m

60-80

Polypropylene

>1,000 m

110-135

Polychloroprene

>1,000 m

90-100

EPDM

>1,000 m

135-150

Insulation (High U)

Polypropylene (thick)

>1,000 m

110-135

U < 10

Polychloroprene (thick)

>1,000 m

90-100

U < 10

EPDM (thick)

>1,000 m

135-150

U < 10

Solid polyurethane

>1,000 m

100-115

U < 8

Insulation (Medium U.)

Foamed polypropylene

<600 m

50-120

4 <U<10

Syntactic polypropylene

>1,000 m

110

5 <U<10

Syntactic polyurethane Conventional

<300 m

100-115

2.5 <U<10

Glass beads

>1,000 m

~100

2 <U<4

Insulation (Low U)

Glass syntactic epoxies

>1,000 m

~100

2 <U<4

Pipe in pipe / jacket

various

100-150

U <1