Garlock GYLON Style 3530 PTFE Gasket Sheet

Name: Garlock GYLON Style 3530 PTFE Gasket Sheet – Datasheet & Quote
Brand: Garlock
SKU: Style 3530

Graphite-filled PTFE for hydrofluoric acid and low-emission joints

GYLON Style 3530 is the black graphite-filled PTFE sheet in the GYLON range. Garlock describes the graphite filling as giving extremely low void content for minimal emissions, with effective, long-lasting service against volatile hazardous pollutants (VHAP and VOC), and says it withstands high concentrations of hydrofluoric acid and other glass-dissolving media.

Media listed are monomer service, cryogenics, highly concentrated hydrofluoric acid and VHAP. The sheet is supplied unbranded, will not support flame or bacterial growth, and serves the same range of industries as the other GYLON styles, from chemical processing and oil and gas to nuclear and water.

Technical specifications

Parameter	Specification
Manufacturer / style	Garlock, GYLON Style 3530
Composition	PTFE with graphite
Colour	Black
Fluid services	Monomer service, cryogenics, highly concentrated hydrofluoric acid and volatile hazardous air pollutants (VHAP), per the Garlock product listing
Temperature, minimum / ideal operating limit / maximum	-450 °F (-268 °C) / 400 °F (204 °C) / 500 °F (260 °C)
Pressure, minimum / ideal operating limit / maximum	Full vacuum / 750 psig (52 bar) / 1200 psig (83 bar)
P x T maximum	350,000 psig x °F (12,000 bar x °C) for 1/32 and 1/16 in; 250,000 (8,600) for 1/8 in
Specifications printed	Will not support flame or bacterial growth; REACH, RoHS and ADI/TSE-free statements listed by Garlock
Compressibility, ASTM F36	7 to 17 %
Recovery, ASTM F36	40 %
Creep relaxation, ASTM F38	29 %
Tensile strength across grain	3000 psi (21 N/mm2)
Specific gravity / density	2.16
Design factors, ASTM F586 (m; y)	1/16 in and under: m 2.8, y 1650 psi (11.4 N/mm2); 1/8 in: m 2.0, y 1650 psi (11.4 N/mm2)
Sealing characteristics	ASTM F37B Fuel A at 1000 psi (7 N/mm2) gasket load and 9.8 psig (0.7 bar): 0.02 ml/hr; DIN 3535 nitrogen at 4640 psi (32 N/mm2) and 580 psig (40 bar): less than 0.015 cc/min
Catalogue example on garlock.com	0.063 in x 40 x 40 in sheet (1.6 x 1016 x 1016 mm), black, unbranded

Values are the typical properties printed in the Garlock spec sheet (August 2023). Garlock marks them as a general guide.

Why choose Style 3530 over the silica and barium grades

Silica-filled sheets such as Style 3500 are not listed for hydrofluoric acid because silica is attacked by it; the graphite filler of Style 3530 is what moves the sheet into that duty. The datasheet leakage figure of 0.02 ml/hr with Fuel A is the lowest in the GYLON group (against 0.04 to 0.33 ml/hr for the others), consistent with the low-void claim.

The mechanical data are moderate: compressibility 7 to 17 %, recovery 40 %, creep relaxation 29 %, tensile strength 3000 psi (21 N/mm2) and specific gravity 2.16. Design factors are m 2.8 with y 1650 psi (11.4 N/mm2) up to 1/16 in, and m 2.0 at 1/8 in. Unlike the other GYLON datasheets this one does not print an FDA or ABS entry, so use another style where those are required.

Related Garlock gasket sheets

The GYLON styles that cover neighbouring chemistries are compared below.

Garlock style	Composition	Colour	Media and use printed by Garlock
GYLON Style 3500	PTFE with silica	Fawn	Strong acids (except hydrofluoric), solvents, hydrocarbons, water, steam, chlorine, cryogenics
GYLON Style 3510	PTFE with barium sulfate	Off-white	Strong caustics, moderate acids, chlorine, gases, steam, hydrocarbons, cryogenics
GYLON Style 3504	PTFE with aluminosilicate microspheres	Blue	Many acids, some caustics, hydrocarbons, solvents, hydrogen peroxide, refrigerants, cryogenics
GYLON Style 3545	Microcellular PTFE with rigid PTFE core	White	Low bolt load and glass-lined equipment, strong acids and caustics, hydrocarbons

Documents, ordering details and quotation

State the HF concentration and temperature when you request Style 3530. Send the fluid, its concentration, working and hydrotest pressure, temperature range, flange class and face finish, bolt material and the thickness and format (sheet or cut gasket) that you want. Garlock states that its figures are based on ANSI raised-face flanges at its preferred torque and that cases near the pressure, temperature or P x T limits should be referred to its engineers, so please allow time for that check. See also gaskets, seals and pipe fittings.

GYLON and BLUE-GARD gasket sheets

The sheets listed here come from two families. GYLON is the PTFE based range for chemical, food and pharmaceutical duties, and BLUE-GARD is the aramid fibre range for water, oils, steam and gases. Each official spec sheet shows the style, service limits, typical properties and the approvals that are printed on it.

Seven Star LLC links the manufacturer document on every product page, so buyers can verify the figures and approvals themselves before they send an inquiry.

Choosing the right style

The correct style depends on the medium and concentration, temperature, pressure, flange facing and bolt load. Send these details with your request for quotation and we compare them with the published Garlock data before we quote, referring critical duties back to the manufacturer. Sheets can be quoted as whole sheets or as gaskets cut to size.

Frequently Asked Questions