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.

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.