Green vs black o rings. Is there a difference?

Color does not provide a 100% iron-clad guarantee to ID the material but most likely the green is hydrogenated buna nitrile (HNBR), which is a more durable compounding of the more typical "plain" black Buna-N (NBR). Better, all things being equal...which may not be the case. Obviously a poor quality HNBR can easily be worse than a good NBR.

The wisps and flakes are usually an indication of either extrusion failure (too soft) or the O-ring having been pinched and sheared. Based on the pictures I think it is extrusion. There may also be a snowball effect at play here. If the cylinder has been disassembled and reassembled, some of the loose material can get trapped in the gap, preventing the two halves from threading together fully. The resulting gap will then make extrusion ever more likely.

Anyway assuming the pictured O-ring isn't already 90 durometer, that would be the thing to try. Plain black Buna-N, green HNBR, or Viton will work perfectly well in this application.

For more information, please visit SBT.

Displaying 1 to 5 (of 5 Products)

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Model Product Name Qty. Price Quantity Discounts K200X12GHSN

OSK&#; Automotive A/C 200 Piece HNBR O-Ring Kit

OSK&#; Automotive A/C O-Ring Kit Our Automotive Green A/C HNBR Kit consists of 200 assorted O-Rings in 12 commonly-used sizes. 200pc O-Ring Kit...

In Stock: 9

$44.450

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Quantity Discounts 1-3$44.-11$40.+$33.340 K200X12H70

OSK&#; O-Ring Kit 200 Piece 12 Sizes HNBR 70 Green

Hydrogenated Nitrile Rubber (HNBR) O-Ring Kit Highly Saturated Nitrile Green O-Rings in 70 durometer. Hydrogenation of nitrile rubber removes most of...

In Stock: 1

$44.450

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Quantity Discounts 1-3$44.-11$40.+$33.340 K382X30H70

OSK&#; Standard O-Ring Kit HNBR Green 70 382pc 30 Sizes

Highly Saturated Nitrile Green O-Rings in 70 durometer. Hydrogenation of nitrile rubber removes most of the residual unsaturation in the polymer to...

If you are looking for more details, kindly visit What Are Green O Rings Made Of.

In Stock: 2

$76.670

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Quantity Discounts 1-3$76.-11$69.+$57.510 K436X36H70

OSK&#; Industrial Standard HNBR Duro 70 O-Ring Kit 36-Sizes

OSK&#; O-Ring Service Kits HNBR 70 Industrial O-Ring Kit This kit contains a total of 436 70 Durometer O-Rings in 36 different sizes, providing...

In Stock: 6

$111.120

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Quantity Discounts 1-3$111.-11$100.+$83.340 K450X18H70-000

OSK&#; 450 Piece O-Ring Kit AS568 -003 to -020 in HNBR 70 Green

OSK&#; O-Ring Service Kit is for small inch size applications. AS568 sizes starts at -003 and goes to -020, 1/16" Cross Section 1-16"...

In Stock: 1

$51.120

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If you want to learn more, please visit our website Oil Seal Single Lip Vs Double Lip.

Quantity Discounts 1-3$51.-11$46.+$38.340