MOS

Troubleshooting

NITRILE RUBBER PACKING

Case	Status	Reason	Response
Deterioration (劣化)	Entire operation surface is hardened. Sheenful surface is already cracked or cracked by pressing with a finger.	Heat generation because of high speed or excessive internal pressure	In the case of piston, change to SPG and SPGW. In the case of load, use back up ring.
	Entire packing is hardened. There is a huge lip dent. Cracked if bent with a finger	Oil temperature is high.	Lower oil temperature or change to heat-resistive material(fluorine rubber ).
		Effect of oil -Inconsistence between oil and rubber material -Oil deterioration	Change to a rubber material with strong oil-resistance. Change to new oil.
	Small cracks across the whole packing surface	Ozone crack by leaving packing in the atmosphere for a long time	Do not open the packing unnecessarily. Keep it sealed in a cool and dark place.
	Small cracks across the whole packing surface	Ozone crack by leaving while being mounted in piston	Do not leave in piston. Assemble into cylinder as soon as possible.
Swelling	Softened generally	Inconsistence between oil and rubber material	Change to a rubber material with strong oil-resistance.
Swelling	Softened generally	Effect of cleaning liquid	Change cleaning liquid. Remove cleaning liquid.
Abrasion	Operation surface is sheenful and abraded on the mirror side.	Operating with small stroke causes insufficient lubrication oil film.	In the case of piston, change to SPG and SPGW. In the case of load, transform back up ring.
		Operation surface illumination is inappropriate (too high)	Change to a recommended thickness.
	Operation width size is circumferentially different on the consecutive base. min width and max width are almost in symmetrical locations.	Offcenter between load cylinder bed, cylinder and piston bed	Control attachment offcenter within the allowable packing limit.
	Circumferential part of operation lip is seriously worn out. abrasion (in line with lateral load)	Excessive lateral load causing abnormal abrasion in wearing( piston), and bearing(load)	Change to more load-enduring wearing and bearing materials.
Scratch	Partial dinge at lip end	Damage by hanging on to nails, wires, etc. for storage or by external force causing local transformation	Improve storage method.
		Insufficient chamfering on the opposite side during assembly	Enlarge chamfering on the opposite side and smoothen to prevent flip over.
		Caused by driver, etc, during assembly	Use assembly fixture.
	Scratch on operation part	Scratch on the opposite operation surface	Inspect sufficiently before assembly.
		Caused by the flip over of the opposite chamfering part during assembly	Perform chamfering according to standard table and soften to prevent flip over.
		Foreign substance embedded	Clean well.
Dinge	Small dinge hole on operation surface	Poor cleaning to leave dust, cutting residue embedded	Remove the foreign substances left on the machine.
Dinge	Small dinge hole on operation surface	Foreign substance gets inside oil or oil oxidation porduct is embedded.	Change to new oil.
Damage	Packing operation lip is damaged in circular form. (piston seal)	Excessive back pressure	Change to OUHR. Change to SPG(SPGW).
	Crack from packing groove	Fatigue failure by frequent impulse pressure	In the case of load, transform buffer ring. In the case of piston, change to SPG(SPGW).
	Crack from packing groove	Operation at lower temperature to be destroyed	Change to a rubber material packing with good cold-resistance.
	Overall operation lip damage	Packing material deterioration	Change to a rubber material with good heat/oil-resistance.
	Overall operation lip damage	Oil deterioration	Change to new oil.
	Damage in 1~2 parts of packing circumference	Packing was installed while being twisted. Assembly in inappropriate state of installation.	Improve installation method and installation fixture.
Burn damage (燒損)	Local burning of lip & groove parts to become carbonized or melted.	Burning damage by insulation compression by residual air	Deflate hydraulic cylinder sufficiently before operation. Do not move to full stroke rapidly. In using Upacking, fill the pocket with grease and make air accumulation smaller.
Stick out	Operation heel is torn.	Excessive gap of leak	Smaller the gap. Transform back up ring.
		Bearing abrasion is huge and Bearing gap increased.	Change the bearing material to an appropriate material.
		Excessive pressure	Transform back up ring and re-select packing. Transform back up ring.
	Fixation heel is torn.	Inappropriate equipment groove structure	Modify chamfering part.
		Gap creation due to the insufficient pressure plate strength	Improve pressure plate strength.
		back up ring is inappropriate	Modify back up ring dimensions. Change back up ring material to a more precise one.
	Packing operation heal and back up ring sticks out.	Excessive gap of leak	Smaller the gap size.
	Packing operation heal and back up ring sticks out.		Back up ring is inappropriate

IRON RUBBER PACKING

case	status	reason	response
Deterioration (劣化)	Lustrous, cracked on the surface or cracked if pressed with a finger	Excessive oil temperature increase	Lower oil temperature or change to a heat-resistive material(fluorine rubber ).
		Inconsistence between oil and rubber material	Check oil-resistance and change packing material, or operation oil.
		Oil deterioration	Change to new oil.
	Poor rubber elasticity to just fall out	Excessive oil temperature increase	Change to a rubber material with heat-resistance and oil-resistance.
		Inconsistence between oil and rubber material	Check oil-resistance and change packing material or operation oil.
		Oil deterioration	Change to new oil.
	Overall operation lip falls out	Excessive oil temperature increase	Change to a heat-resistive rubber material.
	Overall operation lip falls out	Inconsistence between oil and rubber material oil deterioration	Check oil-resistance and change packing material, or operation oil. Change to new oil.
Abrasion	Operation surface is lustrous and worn on the mirror side.	In operation with small stroke, lubricate oil film formation is insufficient.	In the case of piston, change to SPG. In the case of load, transform back up ring.
	Operation surface is lustrous and worn on the mirror side.	All-time pressure application at least 3MPa	In the case of piston, change to SPG. In the case of load, transform back up ring. Check system resistance and change the system structure to make low-pressure.
	Part of operation lip circumference is seriously worn out (in line with lateral load)	Excessive lateral load to cause wearing( piston), bearing(load) abnormal abrasion	Change the wearing and bearing material to a more load-enduring one.
	Operation surface is worn.	In operation with small stroke, lubricate oil film formation is insufficient. Operation heating is huge and oil film is thin.	In the case of sharp lip, change to R lip type. Change to a seal with excellent self-lubrication. In the case of load packing, add buffer ring.
Scratch	Ip end is partially torn or dented.	Hung on needles, wires, etc. during storage to receive external force	Improve storage method.
			Enlarge the opposite-side chamfering and soften to prevent flip over.
		Tearing/denting by needle, drive, etc. during assembly	Use assembly fixture
	Operation is scratched.	Scratch on the opposite-side operation surface	Inspect sufficiently before assembly.
		Scratch on the opposite-side operation surface	Enlarge the opposite-side chamfering and soften to prevent flip over.
		Scratch by embedded foreign substances	Clean well.
	Lip end is scratched.	Scratch by the flipped over opposite-side chamfering while assembly	Soften the opposite-side surface according to dimension table.
Damage	Packing operation lip is damaged in circular form. ( piston seal)	Excessive back pressure	Change to OUHR. Change to SPG(SPGW).
Damage	Crack from packing groove	Fatigue failure by frequent impulse pressure	In the case of load, transform buffer ring. In the case of piston, change to SPG(SPGW).
Stick out	Operation heel is torn.	Excessive gap of leak	Smaller the gap. Transform back up ring.
		Bearing abrasion is huge and Bearing gap increased.	Change the bearing material to an appropriate material.
		Excessive pressure	Transform back up ring and re-select packing. Transform back up ring.
	Small dent from operation surface heel to ilp end. Thin film-shaped spill part is attached on the heel part.	Excessive gap of leak	Narrow the gap size. Transform back up ring.
		Pressure excessive	Transform back up ring and re-select packing. Transform back up ring.
	Operation heel sticks out and is transformed. The overall color is changed into red.	Excessive gap of leak	Narrow the gap size. Transform back up ring.
		Bearing abrasion is huge and bearing gap increases.	Change the bearing material to an appropriate material.
		Pressure excessive	Transform back up ring and re-select packing. Transform back up ring.
	The outside surface of Pure PTFE back up ring is torn and the packing thereof sticks out and is transformed.	Insufficient back up ring strength & poor abrasion-resistance	Change the back up ring material to19YF or 80NP.
Burn damage (燒損)	Packing groove is locally burned and carbonized.	Burn damage by insulation compression by remaining air	Deflate Hydraulic cylinder sufficiently before start. Do not move to full stroke rapidly. In using Upacking, fill the pocket with grease and make air accumulation smaller.
Transform	Two points on outside surface are transformed and damaged.	Poor installation on groove

Combination SEAL & SEAL-related products

Case	Status	Reason	Response
Deterioration (劣化)	Crack in back ring	Use at high temperature.	Change to a more heat-resistive back ring material.
Abrasion	Part of seal circumference is seriously worn out (in line with lateral load).	Offcenter by abnormal abrasion in wearing and bearing caused by excessive lateral load	Change to a more lateral load-enduring wearing and bearing material.
Abrasion		The opposite-side operation surface is partially rough.	Finish the illumination evenly (recommendate치:0.4~3.2μmRy)
Scratch	Rareflonring Operation is scratched.	Scratch on the opposite-side operation surface	Inspect sufficiently before assembly.
		Burr flip over on the opposite chamfering part while assembly	Do chamfering on the opposite side according to standard table and soften to prevent burr flip over.
		Foreign substances such as metal power are embedded.	Remove foreign substances. Design Contami seal (KZT) on both sides of packing.
Stick out	Seal operation has a film-shaped stick out.	Leak gap is huge. Pressure is high	Narrow a leak gap. Change to a stronger material. Change to a back up ring-attached SPGW.
Dent (embedded Foreign Substance)	Foreign substance is embedded in seal, back up ring.	Foreign substance exists inside oil and system.	Clean well. Design Contami seal KZT) on both sides of packing.
Dent (embedded Foreign Substance)	Foreign substance is embedded in seal, back up ring.	Piston and cylinder are scratched to create metal powder.	Change the wearing and bearing material to a lateral load-enduring one.
Stick out (backup ring)	Back up ring has a stick-out case.	Leak gap is huge. Pressure is high	Narrow a leak gap. Change to a stronger back up ring material.
Burn damage (燒損)	One side of wearing is carbonized.	Burn damage by insulation compression by remaining air	Narrow a leak gap. Change to a stronger back up ring material.

Dear visitors Thank you for coming to the E-mos homepage. The company produces sealing-related rubber products used for semiconductors, LCD-related equipment, industrial devices, etc.