Fine cut Granular PTFE

Updated on: 27.02.2020 Page 1 of 8

PROCESSING GUIDE

®

®

® ® ®

®

INTRODUCTION

BASICS

PROPERTIES

50

Properties

%

%

UnitTest Method

450

610

350

630

4

350

640

460

50

655

Fine cut Granular PTFE

Updated on: 27.02.2020 Page 2 of 8

Figure 1- Schematic diagram of preforming and sintering sequence with PTFE

1. Compression

2. Cohesive strength

3. Elastic recovery

4. Delayed recovery

5. Thermal expansion

6. Coalescence (major void elimination)

7. Fusion

8. Minor void elimination

9. Crystallization

10.Thermal contraction

Pressure

Updated on: 27.02.2020 Page 3 of 8

Fine cut Granular PTFE

Figure 2- Transition of PTFE Molecule

®

®

PREFORMING

Below 19°C

13 CF2 per 180°

Below 19°C

15 CF2 per 180°

Updated on: 27.02.2020 Page 4 of 8

Fine cut Granular PTFE

610

640 & 655

630

610

630 & 655

640

INOFLON® Fine cut Grades

45

40

35

30

25

20

15

10

Preforming Pressure (MPa)

10 15 20 25 30

® Fine cut granular PTFE grades

INOFLON® Fine cut Grades

450

400

350

300

250

200

150

100

50

0

Preforming Pressure (MPa)

10 15 20 25 30

Updated on: 27.02.2020 Page 5 of 8

Fine cut Granular PTFE

SINTERING

Table 2- Recommended preforming pressure

610

630

640

655

INOFLON® Grades Recommended preforming pressure (MPa)

Updated on: 27.02.2020 Page 6 of 8

Fine cut Granular PTFE® Fine cut granular PTFE, Solid billets (Ref. - Table 3)

Typical Sintering Cycle

Table 3-Typical sintering cycle for INOFLON® Fine cut granular PTFE, Solid billets:

450

400

350

300

250

200

150

100

50

0

300300

375 375

330

290

2525

Sintering Steps

1 2 3 4 5 6 7

A

B

C

F

50

100

150

Cycle

Sintering Steps

Diameter (mm)

1

3

4

4

2

1

4

3

1

3

4

3

4

5

6

5

1

5

6

6

1

5

6

7

3

4

4

Time Duration (Hours)

Time (hrs)

13

33

40

Total

Updated on: 27.02.2020 Page 7 of 8

Fine cut Granular PTFE® Fine cut granular PTFE, Annular billets (Ref. - Table 4)

Table 4 -Typical sintering cycle for INOFLON® Fine cut granular PTFE, Annular billets:

A

B

C

F

50

100

150

Cycle

Sintering Steps

Wall Thickness (mm)

1

3

2

1

3

4

6

10

3

1

3

4

4

1

1

5

1

3

6

3

6

11

14

7

11

8

1

3

9

4

6

10

10

3

Time Duration (Hours)

Time (hrs)

54

Total

Typical Sintering Cycle

450

400

350

300

250

200

150

100

50

0

300300

340

340 330

290

2525

Sintering Steps

1 2 3 4 5 6 7 8 9 10

330

375 375

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Americas1212 Corporate Dr., Suite-540,Irving, TX 75038, USA +1 512 446 7700

The information provided in the bulletin is furnished at no cost to the recipient and is based on information and technical data that Gujarat Fluorochemicals Limited believes is correct and sound. Those who

any loss or damage caused directly or indirectly due to use of any information provided in this bulletin. Nothing contained herein can be taken or construed as a grant of license by GFL to operate under or a recommendation to infringe any patents.NOTE warning: Do not use any of INOFLON® PTFE resins in medical devices that are designed for permanent implantation in the human body. For other medical uses, prior permission of GFL may be sought.

SALES AND TECHNICAL SUPPORT

Updated on: 27.02.2020 Page 8 of 8

HANDLING AND STORAGE

SAFTEY PRECAUTIONS

Fine cut Granular PTFE