■ Comparison of physical properties ■

Item		High Performance Sheet Gasket								Compressed Fiber Sheet
		No.UF300		No.GF300		No.SF300		No.MF300		No.6500		No.6502		No.6503
Thickness	(mm)	1.5	3.0	1.5	3.0	1.5	3.0	1.5	3.0	1.5	3.0	1.5	3.0	1.5	3.0
Physical Properties
Tensile strength （across grain）	（MPa）	12.0	14.6	12.4	10.9	16	15.8	12	14.1	17	15.3	13.1	12.5	19.2	18.1
Compressibility （34.3MPa）	（％）	4	4	5	4	5	6	5	4	10	10	9	10	9	6
Recovery（34.3MPa）	（％）	49.0	46	53	54	42	50	32	36	57	55	67	64	60	61
Flexibility with grain in multiple to thickness	（kg/m3）	＜2	＜2	＜2	＜2	＜2	＜2	＜2	＜2	9	9	11	12	10	10
Density		2576.0	2557	2315	2262	2319	2280	2910	2839	1810	1813	1761	1759	1803	1857
Oil resistance 〈IRM903 OIL 150℃×5h〉
Tensile strength loss	（％）	0.6	0.2	1.0	7.6	3.8	5.1	1.5	5.9	16.7	6.3	9.2	9.6	13.0	0.0
Thickness increase	（％）	0.0	0.0	0.2	0.1	0.0	0.0	0.2	0.2	2.2	1.2	1.3	1.0	2.1	0.6
Weight increase	（％）	0.4	0.2	0.5	0.6	0.5	0.7	1.1	1.4	3.9	3.2	4.4	3.0	4.2	1.7
Fuel oil resistance 〈JIS fuel oil B RT × 5h〉
Thickness increase	（％）	0.0	0.3	0.4	0.3	0.4	0.1	0.2	0.5	5.6	2.8	4.3	2.6	5.4	2.3
Weight increase	（％）	1.0	1.2	0.9	1.2	0.9	1.3	0.9	1.8	5.6	4.0	6.7	6.0	7.0	3.2
Creep relaxation〈 JIS R 3453 Tightening stress 20.6MPa 〉
100℃×22h		20.3	44.5	16.2	37.0	16.1	42.7	16.9	30.2	27.5	47.0	23.5	37.8	27.3	45.0
200℃×22h		44.7	71.9	35.3	65.8	40.5	68.8	35.8	55.0	52.0	78.8	41.1	65.5	43.6	60.5
Sealability〈JIS 10K50A, Internal pressure 1.0MPa, Tightening stress 25.5MPa, Thickness 1.5mm〉
Without paste	(Pa・m3/s)	1.7×10-4 or below		1.7×10-4 or below		1.7×10-4 or below		1.7×10-4 or below		1.4×10-3		1.9×10-4		1.2×10-3
	(atm・㏄/min. )	0.1 or below		0.1 or below		0.1 or below		0.1 or below		0.83		0.11		0.74
With paste	(Pa・m3/s)	-		-		-		-		1.7×10-4 or below		1.7×10-4 or below		1.7×10-4 or below
	(atm・㏄/min. )	-		-		-		-		0.1or below		0.1or below		0.1or below

Note（1） Flexibility is in accordance with JIS R 3453 6.2.5. Refer to “Comparison of high temperature hardening properties”.
Remark All the above physical properties are measurement examples, and not regulatory values.

The following descriptions summarizes precautions for design, srorage, and installation, in order to properly use Sheet Gasket.

▼ Notes to be observed in design
1．Determine the number and size of bolts and gasket dimensions to provide gaskets with sufficient tightening stress, and also check the flange construction and bolt arrangement to ensure uniform distribution of the tightening stress.
2．Surface finish of the flange shall be about 6.3 Ra (reference: 25 S). Excessive smooth finish may cause slippage on the gasket, leading to crush.
3．Determine the construction, material and dimensions so as to prevent warpage or bowing of the flange at the time of application of internal pressure.
4．Consideration shall be given in design to prevent application　of excessive thermal stress or repetitive bending stress on the joints.
5．Piping design shall not allow accumulation of drain or scale　at the flange sections.
6．Consideration shall be given to prevent transmission of vibration to the joints.

▼ Notes to be observed before installation
1．Ensure perpendicularity of the flange and the pipe.
2．Ensure the shaft alignment of the mating flanges.
3．Check for any deformation of flanges.
4．Check for any deformation of flanges.
5．When changing only gaskets for the existing equipment or at　a piping joint, clean the junctions and check for any damage,　and repair if required.
6．Pay attention not to give damage to the gaskets during storage up to installation, or during installation work.

▼ Notes to be observed before installation
1．When installing gas seals, refer to the following "Counter measures against permeation leakage".
2．Install the gaskets in a clean environment so as to prevent entry of foreign substances between the gaskets and the flanges.
3．Flange bolts shall be gradually tightened each time, and repeat this process 4 to 5 times, so as to finally ensure uniform tightening.
4．When tightening, pay attention to prevent the occurrence of crush.
5．In particular, when using gaskets of 150 Lb, 1B or smaller, or those of smaller gasket width, care shall be given as gasket stress is likely to be excessive.
6．At the time of load up or restarting, check for any loose bolts.
7．If retightening of gaskets that have already once experienced leakage fails in preventing leakage, replace them with new ones.
8．Please note that joint sheet may harden over 100℃. Please refer to precaution of available range per fluid and adequate tightening shall be performed initially to avoid retightening after use at high temperature. If necessary, retightening should be performed within 24 hours after heating operation starts and material hardening is not significant yet.

▼ Notes to be observed in storage
1．Store these joint sheets in a cool and dark place not subject to direct sunshine, fresh air or ozone.
2．Storage selected shall be in a clean environment, free from dust as well as from high temperature & high humidity and corrosive atmosphere.
3．If hanged on nails or the like, gaskets may suffer breakage or permanent deformation, so that, as far as practicable, they should be put in a can or wrapped in a polyethylene bag and stored in a paper box.
4． Large sized gaskets shall be put between larger plates without rolling and placed horizontal for storage.

▼ Precautions for safe use　for PTFE
Please do not use this products in molten alkali metal, high temperature hydrofluoric acid and chlorine trifluoride due to chemical erosion.

Since permeation leakage occurs in High Performance Sheet Gasket, the following points shall be observed for gas seals.

1．Apply gasket paste on the cut surface of the gasket inner diameter side. Application of gasket paste on the contact surface between the gasket and the flange is likely to cause crush, so that attention is required in tightening, and also the amount of gasket paste shall be minimized.
2．Maintain the tightening stress to be around 35 MPa. Also use ring gaskets instead of full-face gaskets, so as to ensure proper tightening stress.
3．Use gaskets with a minimum thickness as far as possible (1.5 mm or less).
4．When using gasket paste, please use "NEW VALFLON Paste". No.6 and No.6M for BLACKHYPER are not recommended.