Envelope Gasket with Inserts

Polytetrafluoroethylene (PTFE) envelope gaskets provide excellent sealing in corrosive environments. PTFE envelope gaskets are available in standard sizes and configurations, as well as custom sizes upon request. PTFE envelope gaskets are available in slit (v-type) or milled (square cut) with a variety of materials available for fillers. 3G can manufacture the envelope gaskets required for your unique situation.

Uses of PTFE envelope gaskets:

– General Purpose Glass Lined Equipment

– Pharmaceutical High Purity

– Piping Service

– Food and Chemical Industries

– Sizes: 1/2″ to 72″

Style GSE is our normal service style envelope gasket that is the standard for glass lined vessels and piping. PTFE slit type and mill type envelope with non-asbestos filler and a SS316 corrugated metal ring as filler.

PTFE envelope gaskets combine the low friction and chemical stability of PTFE with the mechanical strength of the gasket material. This provides the user with a gasket that can be used confidently with aggressive media which would attack many other materials. 3G can supply PTFE envelope gaskets to suit all flange types and sizes.

Temperature: up to +250ºC (depending on the gasket material used).
Applications: Glass lined pipe systems, distillation columns and reactor vessels where non contamination is essential.

Availability:

ASME B16.21 Class 150

	IBC Gasket	Full Face Gasket
Nominal Bore (in)	OD x ID (mm)	OD x ID (mm)	Number of Bolt Holes	Hole Diameter(mm)	Bolt P.C.D.(mm)
½	48 x 21	89 x 21	4	16	60
3/4	57 x 27	95 x 27	4	16	70
1	67 x 33	108 x 33	4	16	79
1 ¼	76 x 42	117 x 42	4	16	89
1 ½	86 x 48	127 x 48	4	16	98
2	105 x 60	152 x 60	4	19	121
2 ½	124 x 73	178 x 73	4	19	140
3	137 x 89	191 x 89	4	19	152
3 ½	162 x 102	216 x 102	8	19	178
4	175 x 114	229 x 114	8	19	191
5	197 x 141	254 x 141	8	22	216
6	222 x 168	279 x 168	8	22	241
8	279 x 219	343 x 219	8	25	298
10	340 x 273	406 x 273	12	25	362
12	410 x 324	483 x 324	12	29	432
14	451 x 356	533 x 356	14	29	476
16	514 x 406	597 x 406	16	32	540
18	549 x 457	635 x 457	16	32	578
20	606 x 508	699 x 508	20	32	635
24	718 x 610	813 x 610	20	35	749

ASME B16.21 Class 300

	IBC Gasket	Full Face Gasket
Nominal Bore (in)	OD x ID (mm)	OD x ID (mm)	Number of Bolt Holes	Hole Diameter(mm)	Bolt P.C.D.(mm)
½	54 x 21	95 x 21	4	16	67
3/4	67 x 27	117 x 27	4	19	83
1	77 x 33	124 x 33	4	19	89
1 ¼	83 x 42	133 x 42	4	19	98
1 ½	95 x 48	156 x 48	4	22	114
2	111 x 60	165 x 60	8	19	127
2 ½	130 x 73	191 x 73	8	22	149
3	149 x 89	210 x 89	8	22	168
3 ½	165 x 102	229 x 102	8	22	184
4	181 x 114	254 x 114	8	22	200
5	216 x 141	279 x 141	8	22	235
6	251 x 168	318 x 168	12	22	270
8	308 x 219	381 x 219	12	29	330
10	362 x 273	445 x 273	16	29	387
12	422 x 324	521 x 324	16	25	451
14	486 x 356	584 x 356	20	32	514
16	540 x 406	648 x 406	20	35	572
18	597 x 457	711 x 457	24	35	629
20	654 x 508	775 x 508	24	35	686
24	775 x 610	914 x 610	24	41	813

ASME B16.21 Class 600

	IBC Gasket	Full Face Gasket
Nominal Bore (in)	OD x ID (mm)	OD x ID (mm)	Number of Bolt Holes	Hole Diameter(mm)	Bolt P.C.D.(mm)
½	54 x 21	95 x 21	4	16	67
3/4	67 x 27	117 x 27	4	19	83
1	77 x 33	124 x 33	4	19	89
1 ¼	83 x 42	133 x 42	4	19	98
1 ½	95 x 48	156 x 48	4	22	114
2	111 x 60	165 x 60	8	19	127
2 ½	130 x 73	191 x 73	8	22	149
3	149 x 89	210 x 89	8	22	168
3 ½	162 x 102	229 x 102	8	25	184
4	194 x 114	273 x 114	8	25	216
5	241 x 141	330 x 141	8	29	267
6	267 x 168	356 x 168	12	29	292
8	321 x 219	419 x 219	12	32	349
10	508 x 273	445 x 273	16	35	432
12	559 x 324	521 x 324	20	35	489
14	603 x 356	584 x 356	20	38	527
16	686 x 406	648 x 406	20	41	603
18	743 x 457	711 x 457	20	44	654
20	813 x 508	775 x 508	24	44	724
24	791 x 610	940 x 610	24	51	838

Gaskets for table A, D, E, F, H, J, K, PN6, PN10, PN16, PN25, PN40 are available on request.

ePTFE Joint Sealants – Universal Gasketing materials

Restructured PTFE Sheet with Glass Micro-Sphere