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Isolating sleeves fit over standard size flange bolts. Isolating washers fit over isolating sleeves. Also available: one-piece sleeves & washers.
GPT 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, GPT 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.
GPT 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. GPT 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.
GPT 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
* = G-7 material should not be used with hydrocarbons, not even trace amounts.
1/8" Washer Material Physical Properties
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.
GPT 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, GPT 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.
GPT 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. GPT 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.
GPT 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
* = G-7 material should not be used with hydrocarbons, not even trace amounts.
1/8" Washer Material Physical Properties
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.
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