PSI Isolating Sleeves
Isolating sleeves are available in the following materials:
Mylar
Polyethylene
Phenolic
Nomex®
G-7 Silicon Glass
G-10 Epoxy Glass
G-11 Epoxy Glass
Designed to easily fit over standard size flange bolts and studs within standard size bolt holes, PSI isolating sleeves have a wall thickness of 1/32" (0.79 mm) and are used with separate isolating and steel washers. They are available for standard American bolt sizes from 1/2" (12.7 mm) to 3-1/2" (88.9 mm) as well as metric bolt sizes from 12 mm and larger.
PSI Isolating Washers
Isolating washers have a standard thickness of 18" and are available in the following materials:
High Strength Glass Clad Phenolic
G-3 High Temp. Phenolic
G-7 Silicon Glass
G-10 Epoxy Glass
G-11 Epoxy Glass
Designed to provide tough, positive isolation. PSI isolating washers are available for bolt sizes from 1/2" (12.7 mm) through 3-1/2" (88.9 mm) and are made to fit over the isolating sleeves.
PSI One-piece Sleeves & Washers
Molded from acetal resin and available for bolt diameters from 1/2" to 1-1/2" (12.7 to 38.1 mm), one-piece sleeves and washers are structurally tough but limited to applications where the flange temperature does not exceed +180°F (+80°C) and compressive loads do not exceed 18,000 psi. They are generally used as single washer sets because they're molded to specific lengths and, in many instances, are longer than the thickness of a single flange. A washer centering ring positions the steel washer on the unit properly to avoid uneven pressures on the washers. G-10 one-piece sleeve / washer assemblies are available for additional strength and convenience.
PSI Steel Washers
Steel washers are designed to fit over the isolating sleeve or the retainer ring on the one-piece sleeves and washers. The outside diameter is sized to fit within the bolt facing on ANSI standard flanges. They are made of 1/8" (3.2mm) thick plated hot-rolled steel.
Sleeve Material Physical Properties
ASTM Test |
Property |
Polye- thylene |
Mylar |
Nomex |
Phenolic |
Silicone Glass G-7* |
Epoxy Glass G-10 |
Epoxy Glass G-11 |
1-piece sleeve & washer |
D149 |
Volts/mil |
400 |
4000 |
400 |
400 |
350 |
400 |
400 |
1,200 |
D695 |
Compressive strength psi |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
18,000 |
D229 |
% water absorption |
0.01 |
0.8 |
N/A |
1.6 |
0.10 |
0.10 |
0.10 |
0.22 |
Operating temp ºF |
-30 to +180 |
-75 to +300 |
-65 to +450 |
-20 to +225 |
Cryogenic to +450 |
Cryogenic to +280 |
Cryogenic to +320 |
-30 to +180 |
Operating temp ºC |
-34 to +82 |
-59 to +149 |
-54 to +232 |
-29 to +107 |
Cryogenic to +232 |
Cryogenic to +138 |
Cryogenic to +160 |
-34 to +82 |
D790 |
Flexural strength psi |
7,000 |
13,000 |
20,000 |
16,000 |
20,000 |
55,000 |
55,000 |
1,400 |
Cut-thru resis- tance ft-lbs |
1,800 |
3,500 |
4,000 |
No test |
No test |
16,000 |
No test |
3,400 |
ASTM Test |
Property |
Glass clad phenolic |
Hi-temp Phenolic G-3 |
Silicone Glass G-7* |
Epoxy Glass G-10 |
Epoxy Glass G-11 |
1-piece sleeve & washer |
D149 |
Volts/mil |
500 |
550 |
350-400 |
550 |
550 |
1,200 |
D695 |
Compressive strength psi |
33,000 |
50,000 |
40,000 |
50,000 |
50,000- 80,000 |
18,000 |
D229 |
% water absorption |
1.6 |
0.7 |
0.07 |
0.10 |
0.10 |
0.22 |
Operating temp ºF |
-65 to +300ºFº |
-65 to +392ºF |
Cryogenic to +450ºF |
Cryogenic to +280ºF |
Cryogenic to +350ºF |
-30 to +180ºF |
Operating temp ºC |
-54 to +149ºC |
-54 to +200ºC |
-Cryogenic to +232ºC |
Cryogenic to +138ºC |
Cryogenic to +177ºC |
-34 to +82ºC |
G-7 material should not be used with hydrocarbons, not even trace amounts.