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EPDM metal core gasket

Implementation of FRP/Thermoplast lines

Padideh Sadrab Paya company has reverse engineered the G-ST-P/S gasket of German company KROLL&ZILLER in different sizes. These gaskets are used in various industries and have very diverse applications. Non-standard design can be done based on the customer’s sample or specific design.

These gaskets are produced with various thermoplastic materials such as SR, VITON, NBR, Chloroprene, EPDM and are used in various industries.

The structure of gaskets

The structure of this type of gasket is a combination of metal and plastic or any other thermoplastic material, in which a metal with a thickness of about 1.5 mm is embedded in its central core. The inner part (inner diameter) is in the form of O-Ring, and the continuation of the gasket is in the form of a cube, which is produced integrally.

Technical advantages of gaskets

1. Due to having a core, these gaskets are not deformed even under high pressure and maintain their stability, while other rubber gaskets get wrinkled and shrink under pressure.

2 . This type of gasket is the best choice for connecting fiberglass flanges to fiberglass and metal flanges.

3. The built-in O-ring at the end of the gasket works great even in the absence of grooves on the flange bottom. The amount of high pressure of the flange bottom (caused by fluid force and test pressure) is absorbed by the metal core and the rigid part of the gasket. The built-in O-ring is compressed and provides a proper seal even with the lowest surface pressure.

4. The ring inside the gasket even compensates for misalignments, flange bottom angle deviations, grooves, elevations, and flange bottom defects.

5. Due to the fact that the knowledge of making this type of gasket has become local, they are not limited in size and shape. The surfaces involved with the flange surface easily find their place on the flange surface and create good sealing.

6. For inch sizes and above with pressure greater than PSI 100, it is recommended to use this type of gasket.

7. Due to the use of a different structure of this type of gasket, it does not require a lot of torque and provides proper sealing with a lower torque, so it minimizes the stress on the R flange part and reduces the possibility of cracks in this area. This point is important for GRP and polyethylene flanges that have a brittle structure.

8.The curve below compares the minimum torque required for three different types of flat gaskets, gaskets with a metal core, and gaskets with a metal core and O-ring. As can be seen, at a pressure of 10 bar, the flat gasket needs more than 110Nm and the gasket with a metal core needs 85Nm of torque, while the gasket with a metal core and ring edge provides proper sealing with only 18Nm. As mentioned in paragraph 7, the ring edge designed in these gaskets is pressed with low pressure and does not require excessive tightening of the screws. While in the case of other gaskets, sometimes due to the lack of proper sealing in the test pressures, it is clearly observed that the screws need to be re-tightened, which causes excessive tension and cracks in the R part of the flange.

Standard	Tolerable pressure (Bar) (Psi)		class	gasket name
ADME B16.21	40	150	150	PSP-G-KAS
ADME B16.22	60	300	300	PSP-G-KAS

Dimensions

Nominal pipe size (inch)	Dimension in mm Pressure class 150 Lbs (d1) (d2) (s1/s2)			Weight (Kg)
3/4	27	54	3/4	0.0125
1	33	64	3/4	0.0175
1 1/2	48	83	3/4	0.040
2	60	102	4/5	0.035
3	89	133	4/5
4	115	171	5/6	0.065
6	160	218	6/8	0.125
8	219	273	6/8	0.190
10	273	337	6/8	0.260
12	325	406	6/8	0.415
14	356	448	7/10	0.815
16	406	512	7/10	1.155
18	457	574	7/10	0.94
20	508	604	7/10	1.325

Nominal pipe size (inch)	Dimension in mm Pressure class 150 Lbs (d1) (d2) (s1/s2)			Weight (Kg)
24	610	715	7/10	1.390
28	720	829	8/11	1.712
30	770	880	8/11	2.150
32	820	937	8/11	2.555
36	920	1045	8/11	3.760
40	1020	1159	8/11	5.135
42	1070	1216	8/11	3.375
44	1120	1273	8/11	3.350
48	1220	1381	8/11	3.665
50	1270	1432	8/11	***
52	1320	1489	8/11	***
54	1370	1546	8/11	***

Table 1: dimensions and size of class 150 gasket

Outer diameter tolerance from size 3/4 inch to 12 inch: 1/5 ± Mm
Outer diameter tolerance from size 14 and larger than 54 inches: 3 ± Mm
Inner diameter tolerance of size from 3/4 to 12 inches: 1/5 ± Mm
Inner diameter tolerance of size 14 and larger than 54 inches: 3 ± Mm
The dimensions of the gasket weight can be changed according to the customer's request.
The weight of the gaskets varies according to the thickness of the gasket.

row	Gender	product code	Appropriateness	Inappropriateness	working temperature wrench	Shore-A hardness
1	EPDM	PSP-G-KAS-EP	Strong acids, alkalis, salts and chlorine	petroleum, solvents or aromatic hydrocarbons	-30°C and 120°C	70±5
2	CR-Chloroprene	PSP-G-KAS-CR	acids with medium pH, alkalis, salts, oil and fossil fuels	oxidizing acids, aromatic compounds, hydrocarbon chloride	-51°C and 121°C	63±5
3	NBR	PSP-G-KAS-NB	oil, gas, fossil fuels, scratch and abrasion resistance	strong oxidizers, chlorinated hydrocarbons, esters and ketones	-51°C and 120°C	30-90
4	SBR	PSP-G-KAS-SB	Weak natural acids, alcohols and common chemicals, ketones	Ozone, strong acids, all kinds of grease and oil and most hydrocarbons	-54°C and 121°C	30-95
5	VITON	PSP-G-KAS-VN	petroleum and fuel, chlorinated solvents, aromatic and fatty hydrocarbons and strong acids	amines, esters, ketones and water vapor	-26°C and 232°C	70
6	NR	PSP-G-KAS-NR	Resistant to solvents and petroleum substances	Ozone, oxygen, sunlight and heat	-55°C and 82°C	25-99

Comparison table of the chemical resistance of the thermoplastic part of the gasket against different fluids

Characteristic	NR	NBR	CR	SBR	EPDM	VITON
A Hard Shore	25~99	25~95	20~95	30~90	25~95	60~90
weather resistance	Weak	Unacceptable	OK	Weak	Great	Great
Resistance to Ozone	Unacceptable	Unacceptable	OK	Unacceptable	Great	Great
Thermal resistance	Unacceptable	Weak	OK	Weak	Great	Great
Low temperature resistance	OK	Weak	OK	Weak	Great	Great
Acid resistance	suitable	OK	OK	OK	Great	Great
alkali resistance	suitable	OK	OK	Weak	Great	Great
Resistance to mineral oil	Unable	OK	OK	Unable	Unable	Great
Resistance to vegetable oil	Weak	Great	OK	Weak	OK	Great
abrasion resistance	Great	Great	OK	Great	OK	Weak
tear resistance	Great	OK	OK	Weak	Weak	Weak
power specification	Great	OK	OK	suitable	OK	Unacceptable
Compression	Great	OK	OK	OK	OK	OK
Impact resistance	Great	OK	OK	Great	OK	Weak
characteristic of being gas tight	Weak	Weak	OK	Weak	Weak	Unacceptable
Flame resistance	Unacceptable	Weak	OK	Unacceptable	Unacceptable	Great
electrical characteristic	OK	Unacceptable	Unacceptable	Weak	Great	Great
color constancy	OK	suitable	Unacceptable	OK	Great	OK
color constancy	OK	suitable	Unacceptable	OK	Great	OK
sticky	Great	OK	OK	Weak	Weak	Great
function	Great	OK	Weak	OK	OK	OK
Water resistance	Great	OK	OK	OK	Great	Great

کاربردهای گسکت ها

Storage and maintenance conditions

Gaskets should always be stored without tension and pressure, avoid hanging big gaskets on hooks.
Gaskets should be placed at least 1.5 meters away from heating devices such as radiators, heaters, heaters and direct flames.
Strictly do not use wire, hard and sharp objects for packaging or transportation and use tarpaulin straps.
Oxygen and ozone are two gases that harden elastomers and weaken their chemical resistance. The warehouse environment should be protected from these two gases as much as possible. Also, the activity of some devices produces ozone and oxygen, so these devices should not be placed in the gasket warehouse. It is better to store the gaskets in opaque or anti-UV packages.
Gaskets must have a date of entry into the warehouse, and old gaskets must always be removed from the warehouse before they can be used.

Reducing the amount of torque required to create proper sealing
Reducing the pressure on the flange and reducing the possibility of cracking
High pressure tolerance
Non-separation of the core from the thermoplastic part
Longer durability of plastic flange connections

The gaskets of this collection are specially made with pay attention to Needs are designed for different industries and Can be used in pipelines with different materials (metal, polyethylene, composite, etc.).

Quality comparison with similar products

row	Gasket size (inches)	product	Send	Quantity in each package
1	from 3/4 to 10	plastic package	Cartoon pack	4
2	12 to 30	Plastic tape around the gaskets	wooden box	4
3	32 and up	Plastic tape around the gaskets	wooden box	2

Padideh Sadrab Paya Company is the first knowledge-based company in the field of implementing composite pipelines, anti-corrosion coatings, strength of concrete and metal structures, tanks and live line leakage. The engineering and industrial network of the country and focusing on the development of knowledge-based business with the support of more than 12 years of capable personnel experience, operates in the fields of water, oil and gas, petrochemical industries, refineries, heavy metal and mining industries.