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SPIRAL BUR 120,65X133,35X3,73 WHITE FDA PTFE (BS427-R55)
Family: PTFE BUR
Dimensions : 120.65 x 133.35 x 3.73
Material: PTFE
Color:
WHITE
Part number: BUR427PT17301
Weight : 0.0130 gr.
Customs tariff code: 39269097
Country of origin: CN
Approvals:
HOMOL-1935/2004
HOMOL-FDA
Quality :
SPIRAL BUR 123,83X136,52X3,73 WHITE FDA PTFE (BS428-R56)
Family: PTFE BUR
Dimensions : 123.83 x 136.52 x 3.73
Material: PTFE
Color:
WHITE
Part number: BUR428PT17301
Weight : 0.0130 gr.
Customs tariff code: 39269097
Country of origin: CN
Approvals:
HOMOL-1935/2004
HOMOL-FDA
Quality :
SPIRAL BUR 127,00X137,01X2,55 WHITE PTFE (BS353) (FDA-Compliant)
Family: PTFE BUR
Dimensions : 127.00 x 137.01 x 2.55
Material: -
Color:
WHITE
Part number: BUR353PTFEXWH
Weight : 6.0000 gr.
Customs tariff code: 39269097
Country of origin: GB
SPIRAL BUR 127,00X139,70X3,73 WHITE PTFE (BS429-R57) (FDA-Compliant)
Family: PTFE BUR
Dimensions : 127.00 x 139.70 x 3.73
Material: PTFE
Color:
WHITE
Part number: BUR429PT17301
Weight : 0.0140 gr.
Customs tariff code: 39269097
Country of origin: CN
Approvals:
HOMOL-1935/2004
HOMOL-FDA
Quality :
SPIRAL BUR 133,35X139,70X2,05 WHITE PTFE (BS252) (FDA-Compliant)
Family: PTFE BUR
Dimensions : 133.35 x 139.70 x 2.05
Material: -
Color:
WHITE
Part number: BUR252PTFESWH
Weight : 3.6000 gr.
Customs tariff code: 39269097
Country of origin: GB
SPIRAL BUR 146,05X156,06X2,55 WHITE PTFE (BS359) (FDA-Compliant)
Family: PTFE BUR
Dimensions : 146.05 x 156.06 x 2.55
Material: -
Color:
WHITE
Part number: BUR359PTFEXWH
Weight : 8.0000 gr.
Customs tariff code: 39269097
Country of origin: GB
SPIRAL BUR 149,23X159,23X2,55 WHITE PTFE (BS360) (FDA-Compliant)
Family: PTFE BUR
Dimensions : 149.23 x 159.23 x 2.55
Material: -
Color:
WHITE
Part number: BUR360PTFEXWH
Weight : 8.0000 gr.
Customs tariff code: 39269097
Country of origin: GB
SPIRAL BUR 158,75X165,10X2,05 WHITE PTFE (BS259) (FDA-Compliant)
Family: PTFE BUR
Dimensions : 158.75 x 165.10 x 2.05
Material: -
Color:
WHITE
Part number: BUR259PTFESWH
Weight : 4.3000 gr.
Customs tariff code: 39269097
Country of origin: GB
SPIRAL BUR 171,45X184,15X3,73 WHITE PTFE (BS440) (FDA-Compliant)
Family: PTFE BUR
Dimensions : 171.45 x 184.15 x 3.73
Material: -
Color:
WHITE
Part number: BUR440PTFESWH
Weight : 18.0000 gr.
Customs tariff code: 39269097
Country of origin: GB
SPIRAL BUR 177,80X187,81X2,55 WHITE PTFE (BS365) (FDA-Compliant)
Family: PTFE BUR
Dimensions : 177.80 x 187.81 x 2.55
Material: -
Color:
WHITE
Part number: BUR365PTFEXWH
Weight : 10.0000 gr.
Customs tariff code: 39269097
Country of origin: GB
SPIRAL BUR 203,20X215,90X3,73 WHITE PTFE (BS445) (FDA-Compliant)
Family: PTFE BUR
Dimensions : 203.20 x 215.90 x 3.73
Material: -
Color:
WHITE
Part number: BUR445PTFESWH
Weight : 22.0000 gr.
Customs tariff code: 39269097
Country of origin: GB
SPIRAL BUR 317,50X330,20X3,73 WHITE FDA PTFE (BS454)
Family: PTFE BUR
Dimensions : 317.50 x 330.20 x 3.73
Material: PTFE
Color:
WHITE
Part number: BUR454PT17301
Weight : 34.0000 gr.
Customs tariff code: 39269097
Country of origin: CN
Approvals:
HOMOL-1935/2004
HOMOL-FDA
Quality :
technical data
Back-Up Rings | Profile | Material | Hardness | Temperature |
BUR | NBR | 90 SH A | -20 to +100/+120 ºC | |
SPIRAL BUR | PTFE VIRGEN | -150 to +260 ºC |
QUICK LINKS
Rings that improve O-Rings performance
Back-up Rings are parts fitted together with an O-Ring. They do not properly have a sealing function but are rather dedicated to improving the performance of said O-Ring. Depending on the application and the housing, one or two BUR can be fitted around the OR allowing its use in static or dynamic systems, in reciprocating or rotating movements and achieving the use of a wide range of OR hardnesses.
Its profile is pretty basic since its most simple version is a rectangular section washer. However, the most standard profile is the concave cross-section washer that allows the O-Ring to be seated, improving the anti-extrusion effect.
The standard material that we usually stock is NBR90 although it can also be manufactured in FPM, PTFE, POM, PU,… on request.
Another very efficient profile in reciprocating applications is the spiral BUR made of virgin PTFE. These are two spiral windings cut at an angle at the end that can be fitted with an FPM OR when the working temperature requires it. Finally, we can highlight that BUR can be cut with different angles, which allows their assembly in closed housings.
To facilitate their identification, although obviously both the concave section rings in NBR90 and the spiral PTFE rings have very standard sizes in their respective ranges, the BS number of the AS-568 range is usually the easiest way to tie in a BUR with an OR. For example, instead of ordering a BUR which sizes are 32.16 × 3.00 × 1.00 / 1.27, it is easier to refer to the BUR218 as it will be fitted with a BS218 O-Ring (31,34×3.53).
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What are Backup Rings (BUR)?
Published : 07/08/2022 | Categories : Back-Up RingsBUR, the O-ring's protector BURs are special rings that provide extra support for O-rings with which they are fitted. Their main purpose is to provide increased extrusion resistance and [...]
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