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Flaretek® Tube Fitting Flare and Assembly Procedures
for 1/4", 3/8", 1/2", 3/4" and 1" sizes
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The flaring process provides a permanent expansion (flare) of the tubing end, allowing insertion of the Flaretek® fitting body. Proper tube flaring and Flaretek® fitting assembly results in a secure tubing connection. |
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Entegris recommends these procedures for flaring standard wall Entegris PFA tubing only (.062" wall thickness for 3/8", 1/2", 3/4" and 1" O.D., .047" wall thickness for 1/4"). |
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Note: The tubing cools rapidly so please read and understand all instructions before flaring your tubing. |
Tubing Preparation
| 1. |
Cut the tubing end squarely (.070" maximum squareness tolerance) using a Galtek® tubing cutter. |
| 2. |
Insert the cut end of the tubing through the non threaded end of the nut. |
Warning: If you do not put the nut on the tube now you will not be able to put it on after you complete the flare.
 Flaretek® fittings are specifically designed, tested and characterized to work together with specific Flaretek® fitting components manufactured by Entegris. Customer assumes the risk of connection integrity if Flaretek® fittings, body and/or nut components are attached to components manufactured by third parties.
Heat Flaring Instructions
| 1. |
If using an Entegris hot air gun, set the hot air gun (see Figure 1) on “high”. Hold the PFA tubing end flush with the heater edge and 1/2" to 3/4" above the heater and slowly rotate the tubing 360° for the approximate time specified in Table 1 or until a fine, clear line appears around the tubing. |
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Note: It is very important to fully rotate the tubing over the heat source so all surface areas receive an equal amount of heat. Uniform heating is essential to making a good flare. |
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If using an Entegris infrared heating tool, turn on heating tool (see Figure 2). Center 1/2" to 3/4" of the PFA tubing between the heat rings. While slowly rotating the PFA tubing back and forth between your forefinger and thumb, heat for the approximate time specified in Table 1 or until a fine, clear line appears around the tubing. |
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Note: To flare 1" tubing with an Entegris infrared heating tool, a larger heat ring (part number 213-91 or 213-92) is needed. |
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Note: It is very important to rotate the tubing through the heat source so all surface areas receive an equal amount of heat. Uniform heating is essential to making a good flare. |
| 2. |
Remove the PFA tubing from the heat source. Immediately push the flaring mandrel (see Figure 3) into the tubing until the end of the tubing reaches the tube stop. Click here for available mandrel configurations. |
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Note: Flaring 1/4" tubing is the most challenging because of its small size. To get a firm grip on the small tube diameter, we recommend using the grip pad that is included in the mandrel kit (for additional grip pad, part number 213-73). |
| 3. |
Firmly hold the tubing onto the mandrel for the time specified in Table 1. |
| 4. |
Let the flared tubing continue to cool on the mandrel the time specified in Table 1. |
| 5. |
The flaring process is now complete and the mandrel may be removed from the tube. |
Room Temperature Flaring Instructions
Reference Room Temperature Flaring Tool instructions that accompany each Room Temperature Flaring Tool Kit (part number 213-112).
Flaretek® Fitting Assembly Instructions
| 1. |
Push the flared tubing end onto the Flaretek® fitting body until the end of the fitting body contacts the flare shoulder of the tube (see Figure 4). The maximum gap between the tube end and end of threads should be .08 -.15". |
| 2. |
Tighten the nut onto the fitting body until handtight (see Table 1 for recommended minimum torque values). |
Table 1
| Tubing and Fitting Size |
1/4" |
3/8" |
1/2" |
3/4" |
1" |
| Heating time for PFA (sec.) |
|
|
|
|
|
| |
Air gun |
15 |
25 |
25 |
25 |
25 |
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Infrared heater |
40 |
50 |
50 |
50 |
60 |
| Hold tubing on flare mandrel (sec.) |
20 |
20 |
20 |
20 |
25 |
| Minimum cooling time on mandrel (min. ) |
2 |
2 |
3 |
3 |
3 |
| Minimum nut torque (inch•lbs. (N•m)) |
|
|
|
|
|
| PFA fitting/PVDF nut |
5 |
8 |
11 |
14 |
30 |
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(.57) |
(.90) |
(1.24) |
(1.58) |
(3.39) |
| PFA fitting/PFA nut |
5 |
8 |
11 |
14 |
30 |
| |
(.57) |
(.90) |
(1.24) |
(1.58) |
(3.39) |
| PFA fitting/CPFA nut |
5 |
8 |
11 |
14 |
30 |
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(.57) |
(.90) |
(1.24) |
(1.58) |
(3.39) |
| PVDF fitting/PVDF nut |
5 |
8 |
11 |
19 |
40 |
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(.57) |
(.90) |
(1.24) |
(2.14) |
(4.51) |
|
|
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Figure 1
Click to enlarge
Figure 2
Click to enlarge
Figure 3
Click to enlarge
Figure 4
Click to enlarge |
Retightening
| All fitting connections assembled using the Room Temperature flaring technique should be retightened to the minimum nut torque values identified in Table 1. |
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| All “SpaceSaver” fitting connections exposed to temperatures >165°F should be retightened to the minimum nut torque values identified in Table 1 (fitting must be returned to room temperature before retightening). |
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