Non-Metallic Gaskets - Arabian BrozNon-Metallic Gaskets A “Soft Gasket” material is a term used...

Non-Metallic Gaskets

A “Soft Gasket” material is a term used when referring to a gasket material that is

easily compressed under a low bolt load. This term has been used to distinguish the

difference from a metallic gasket. A soft gasket material can be selected from a large

variety of elastomers, compressed non-asbestos, PTFE, flexible graphite and high

temperature sheet products. Soft gaskets are used in a wide range of applications such

as for pipe flanges, heat exchangers, compressors and bonnet valves, to name just a

few. Soft gasket material can be purchased in a variety of cut shapes or be provided in

sheet or rolls

Types

1- Compressed Non-Asbestos Sheet

2- Tanged Graphite Sheet

3- Rubber Sheet

4- PTFE Sheet

5- Envelope Gasket (PTFE with Nin-Asbestos)

Compressed Non-Asbestos Sheet

Most manufacturers of non-asbestos sheet materials use synthetic fibers, like aramid

or Kevlar, in conjunction with an elastomeric binder. The elastomeric binder makes

up a larger percentage of this sheet and thereby becomes a more important

consideration when determining applications

.

1- NON ASBESTOS GASKET JOINTING SHEET STYLE 01

Suitable for water/oil resistant gasket material for light to medium loading. Suitable

for low operating pressure, e.g. transformers, compressors and also used for

easily deformable components with low surface pressure like valve covers and

pans in internal combustion engines.

General Data

Material Composition(Type of fiber ) Aramid Fiber,

Mineral Fiber

Binders NBR

Operating Condition:

Max.Peak Temp 300°C

Max. Continuous Temp 220°C

Max.Continuous Temp. with steam160°C

Max. Operating Pressure 80 Kg/cm2

Specified Value Unit Test Method Properties S.NO

1.70 - 2.00 gm/cm3 DENSITY 1

TENSILE STRENGTH 2

> 8 N/mm2 (a) ACC to ASTM F152(ACROSS

GRAIN)

> 5 N/mm2 (b) ACC to DIN52910 (ACROSS

GRAIN)

5 – 15 % ASTM F36A COMPRESSIBILITY 3

> 50 % ASTM F36A RECOVERY 4

ASTM F 146 FLUID ABSORPTION 5

(a) IN ASTM OIL NO. 3

< 15 % NCREASE IN MASS

< 10 % INCREASE IN THICKNESS

ASTM F 146 (b) IN FUEL B

< 10 % INCREASE IN MASS


ASTM F 146 (c) IN WATER/ANTIFREEZE



< 35 % DIN 52911 IGNITION LOSS 6

< 1.0 cm /min. DIN 3535 SEALABILITY AGAINST Nitrogen 7

STRESS RESISTANCE 8

N/mm2 DIN 52913 16h 300 C

N/mm2 DIN 52913 16h 175 C

From 1.5 to 6 mm Thickness < 1mm = ± 0.10 mm

> 1mm = ± 10% Thickness Tolerance

± 50 mm Length

± 50 mm Width

2- STEEL NON ASBESTOS GASKET JOINTING SHEET STYLE 02

Suitable for oil resistant gasket material for light to medium loading. Suitable for

low operating pressure, e.g. transformers, compressors and also used for easily

deformable components with low surface pressure like valve covers and oil pans in

internal combustion engines.

General Data

Material Composition (Type of fiber) Aramid Fiber . Mineral Fiber

with metal gauge center

Binders NBR




Max.Continuous Temp.with steam 160°C



1.70 - 2.00 gm/cm3 DENSITY 1

TENSILE STRENGTH 2

> 8 N/mm2 (a) ACC to ASTM F152(ACROSS

GRAIN)

> 5 N/mm2 (b) ACC to DIN52910 (ACROSS

GRAIN)





< 15 % NCREASE IN MASS








< 32 % DIN 52911 IGNITION LOSS 6

< 1.0 cm /min. DIN 3535 SEALABILITY AGAINST Nitrogen 7

STRESS RESISTANCE 8

N/mm2 DIN 52913 16h 300 C

N/mm2 DIN 52913 16h 175 C



± 50 mm Length

± 50 mm Width

3- NON ASBESTOS GASKET JOINTING SHEET STYLE 03

Suitable for high performance, oil resistant gasket material with excellent thermal,

chemical & mechanical properties. Suitable for compressors, pipelines,

transmission, gas meters and internal combustion engines, pipe unions & pumps

etc.

General Data

Material Composition (Type of fiber) Aramid Fiber, Mineral

Fiber

Binders High quality NBR




Max.Continuous Temp.with steam 240°C



1.70 - 2.00 gm/cm3 DENSITY 1

TENSILE STRENGTH 2

>14 N/mm2 (a) ACC to ASTM F152(ACROSS

GRAIN)

>11 N/mm2 (b) ACC to DIN52910 (ACROSS

GRAIN)





<10 % NCREASE IN MASS

<8 % INCREASE IN THICKNESS







<30 % DIN 52911 IGNITION LOSS 6

<0.5 cm /min. DIN 3535 SEALABILITY AGAINST Nitrogen 7

STRESS RESISTANCE 8

~ 20 N/mm2 DIN 52913 16h 300 C

~ 30 N/mm2 DIN 52913 16h 175 C



± 50 mm Length ± 50 mm Width

Tanged Graphite Sheet

Tanged graphite gaskets range of graphite sheet sealing materials are manufactured

from highly pure exfoliated graphite flake, with/without a reinforcing metallic core

316L with the standard product offering graphite with a carbon content of 98% whiles

for nuclear purposes its 99.85%.

Tanged graphite gasket laminates by Arabian Broz Gasket are suitable for moderately

high temperature/high pressure gasket applications with a wide range of media. Using

mechanical means or certain adhesives, graphite foils can be attached to the

reinforcing core.

Dimensions of standard sheets: Thickness: 1.5, 2.0 and 3.0mm (2mm available on request)

Tolerances: Thickness: <1mm = ± 0.1mm, 1mm = ± 10%, Length: ± 50mm, Width: ± 50mm

Compressibility ASTM F36 30%

Recovery ASTM F36 23%

Tensile Strength ASTM F152 34.5

N/mm2

Creep Relaxation ASTM F38B 10%

Gas Permeability DIN 3535/4 0.4 ml/min

Maximum Operating Conditions

Peak Temperature 500°C (650°C in steam)

Minimum Temperature -200°C

Pressure

140 bar

P x T, Max 25000

Rubber Sheet

Rubber is a soft gasket material. A wide range of elastomers can be used, such

as neoprene, nitrile, EPDM and natural rubber. Rubber gaskets are used in a wide range of

applications such as pipe gaskets, heat exchangers, and many ways.

EPDM, (Ethylene Propylene-Diene Monomer):

This polymer has superior resistance to ozone, heat and sunlight applications. It

has good resistance to water and steam EPDM is available in black, white (FDA) and

purple. It is sulphur and peroxide curable

Resistant to: Animal and vegetable oils, ozone, strong and oxidizing chemicals.

Poor resistance to petroleum based fluids

Attacked by: Mineral oils and solvents, aromatic hydrocarbons

Color Black

Size 1mm,3mm,5mm

Hardness 75 ± 5Shore A

Tensile Strength / Elongation Min, 3MPA, Min 200%

Temperature Range -45ºC to 120 ºC

Surface Smooth

Natural Rubber, (NR) (Pure Gum Amber):

It is a natural product extracted from tropical plants. It has excellent flexibility,

tensile elongation & abrasion resistant.

Resistant to: Most moderate chemicals, wet or dry, organic acids, alcohols, ketones,

aldehydes

Poor resistance to petroleum based fluids.

Attacked by: Ozone, strong acids, fats, oils, greases, most hydrocarbons

Color Black

Size 1mm,3mm,5mm




Surface Smooth

Neoprene®

(Chloroprene) (CR):

is a synthetic polymer that offers Good weathering resistance. Flame retarding.

Moderate resistance to petroleum based fluids

Resistant to: Moderate chemicals and acids, ozone, oils, fats, grease, many oils, and

solvents

Moderate resistance to petroleum based fluids

Attacked by: Ozone, strong acids, fats, oils, greases, most hydrocarbons

Color Black

Size 1mm,3mm,5mm




Surface Smooth

Silicone(SI)(Polysiloxane):

has high temperature properties as well as excellent tensile strength, compression set

and is a fungus resistance material. It has good resistance against many chemicals,

including acids, oxidizing chemicals & ammonia. Available in red, grey, white(FDA)

orblack.excellent high and low temperature properties

Resistant to: Moderate or oxidizing chemicals, ozone, concentrated sodium

hydroxide

Attacked by: Many solvents, oils, concentrated acids, dilute sodium hydroxide

Color Black

Size 1mm,3mm,5mm




Surface Smooth

Nitrile (Buna-N) (NBR):

is an elastomer that has superior resistance to petroleum based hydraulic fluids,

alkalis, acids, aliphatic and aromatic hydro carbonates, animal & vegetable oils

Resistant to: Many hydrocarbons, fats, oils, greases, hydraulic fluids, chemicals

Attacked by: Ozone (except PVC blends), ketones, esters, aldehydes, chlorinated and

nitro hydrocarbons

Color Black

Size 1mm,3mm,5mm




Surface Smooth

Cloth Inserted Rubber

Composition: Neoprene or SBR

General Properties: Excellent physical properties

Temperature Range: Neoprene -20°F to +180°F; SBR -20°F to +170°F

Cloth Inserted (CI) Rubber is a rubber sheet material that has been reinforced with

one or more plies of cloth or duck such as polyester, nylon, cotton or fiberglass fabric.

This reinforcement gives added stability in flanged gasket applications requiring

mechanical fastening and reduces creep when there are high compression loads. Our

gasket material inventory includes cloth inserted Neoprene and SBR Red Rubber and

Nitrile (Buna-N) Sheet.

A-Cloth Inserted Neoprene Rubber Sheet is suitable in applications requiring

minimal oil resistance and where hot and/or cold water and gases are being

transferred. Such applications might include meters, control devices, regulators,

pumps and diaphragms.

Polymer: Chloroprene reinforced with 3.4 oz/sq. yd. nylon fabric

hardness 60 ± 5 Shore A

Temperature Range

-20°F to +180 °F

Tensile Strength 1100 PSI

Finish Plate

Gauge (thickness) 1.5mm, 3mm, 5mm,6mm

Oil Resistance Medium

Grades commercial black neoprene rubber

B-Cloth Inserted SBR Red Rubber Sheetis suitable for use in hydraulics and where

air, water or low pressure steam will be passed.

Polymer: Styrene-Butadiene rubber reinforced with 3.4 oz/sq. yd. nylon fabric

hardness 60 ± 5 Shore A

Temperature Range

-20°F to +170 °F


Finish Plate


Oil Resistance Medium

Grades commercial black SBR rubber

C-Cloth Inserted NBR Nitrile (Buna-N)is suitable for applications needing

resistance to oil, caustics, and aliphatic hydrocarbons.

Polymer: Butadiene and Acrylonitrile

hardness 60± 5 Shore A

Temperature Range

-20°F to +170 °F


Finish Plate


oil resistance High

Grades Commercial

PTFE SHEET

PTFE is totally unique. It has excellent resistance to most mineral and organic

chemicals such as acids, bases, and solvents, and can be used up to approximately

260⁰C.

PTFE is generally used in the presence of aggressive chemicals. It can be supplied as

a bore liner to shield pipe gaskets from chemical attack: these are supplied to fit

specific bore sizes, and are known as PTFE envelopes.

PTFE has the same co-efficient friction as ice on ice, so it is an exceptionally non-

stick material. More information about PTFE can be found in the following guide to

PTFE.

FEATURES AND BENEFITS

Tight seal

Improved performance over conventional PTFE

Reduced product loss and emissions

Reduced creep relaxation

Unique manufacturing process minimizes cold flow problems typical of

skived and expanded PTFE sheets

Excellent bolt torque retention

Withstands a wide range of chemicals for extended service life in a wide

variety of applications

Offers some of the largest sheet sizes in the industry

Improved material utilization reduces waste

Branding and color coding reduces misapplication

Will not burn

Will not support bacterial growth

PTFE TYPES :

Expanded PTFE sheet

is much softer and more flexible than regular PTFE and thus conforms easily to irregular

and rough surfaces. The material is easier to compress and minimizes creep and cold

flow. Conforms to FDA regulations..

Temperature Minimum : -450 °F

Maximum : 500 °F

Color White

Tensile strength 2900 psi 2900 psi

PH 0-14

Density 0.9 g/cm3

Thickness 1.5 – 6 mm

PTFE Film (virgin solid sheet)

https://www.ramgaskets.com/all-about-ptfe/

https://www.ramgaskets.com/all-about-ptfe/

Virgin PTFE contains no fillers and has almost universal chemical

resistance. It has excellent insulating capabilities and high dielectric

properties. Its high temperature stability allows for continuous use at 260°C. Virgin

PTFE has excellent low friction, non-stick and releaseproperties.

Temperature Minimum : -328 °F

Maximum : 500 °F

Color White

Tensile strength 1500-2400psi

PH 0-14

Density 2.15 g/cm3

Thickness 1.5 – 6 mm

Reinforced PTFE with silica filler

resistant to: Strong acids (except hydrofluoric), solvents, hydrocarbons, water, steam, chlorine, and cryogenics. Conforms to FDA regulations.

Reinforced PTFE with glass microspheres filler

resistant to: Moderate concentrations of acids and some caustics, hydrocarbons, solvents,

water, refrigerants, and cryogenics. Conforms to FDA regulations. Glass has little effect on most of the electrical properties of PTFE.

Reinforced PTFE with barium sulfate filler

resistant to: Strong caustics, moderate acids, chlorine, gases, water, steam, hydrocarbons, and aluminum fluoride Conforms to FDA regulations.

.

PTFE ENVELOPE GASKET

A PTFE envelope gasket is a composed gasket. The product consists of an envelope of

PTFE with an inlay. The envelope gasket is mainly applied as a flange gasket in

applications where a high chemicaland high pressure resistance is required.

PROPERTIES OF A PTFE ENVELOPE GASKET

Envelope gaskets have the chemical resistance of PTFE, but the strength and resilience of the

inlay material. PTFE envelope gaskets combine the benefits of different materials:

Good chemical resistance.

Wide temperature range. This depends both on the envelope as the inlay material.

Good pressure resistance, depending on the choice of the inlay material.

APPLICATIONS OF THE PTFE ENVELOPE GASKET

In a chemical aggressive environment, where pollution of the medium is not allowed, it is

complicated to apply a standard gasket. Here PTFE envelope gaskets are applied as flange

gaskets. For example, in the (petro) chemical industry and in the process industry.

The envelope gaskets are also ideal for application in the food industry. PTFE is

physiologically inert and may be used in direct contact with food (FDA).

MATERIAL POSSIBILITIES

The composition of the PTFE envelope gasket depends on the application. Non-asbestos

gasket sheets (high-pressure) and various rubber grades are amongst others applied as inlay

material. For applications where a high mechanical strength at elevated temperatures is

required

.Specification

Temperature: -100~260oC

Max. Pressure: 50bar

https://www.ridderflex.com/cat/non-asbestos-gasket-material/

https://www.ridderflex.com/cat/non-asbestos-gasket-material/

https://www.ridderflex.com/cat/rubber/

Dimensions for Cut Gaskets

Dimensions to suit ANSI Standard Flanges

ASME B16.21 Class 150



ASME B16.47 A Class 150

ASME B16.47 B Class 150

ASME B16.47 B Class 300

ASME B16.47 B Class 600 (continued)

Dimensions to suit DIN Standard Flanges

PN10

PN25

PN25 (continued)

PN40

PN40 (continued)

Gaskets for use with BS10 Flanges

Table A

Table D

BS10 Table E

BS10 Table E (continued)

BS10 Table F

BS10 Table F (continued)

BS10 Table H

BS10 Table J

BS10 Table J (continued)

BS10 Table K

Non-Metallic Gaskets - Arabian BrozNon-Metallic Gaskets A “Soft Gasket” material is a term used...

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Transcript of Non-Metallic Gaskets - Arabian BrozNon-Metallic Gaskets A “Soft Gasket” material is a term used...