PDF《Hytrel》

6 compares the melt viscosity versus temperature relationships for polymers of Hytrel with various other thermoplastic polymers. Processing Type Temperature, °C (°F) Hytrel G3548W

190 (374) Hytrel G4074

200 (392) Hytrel G4774

230 (446) Hytrel G5544

230 (446) Hytrel

3078 190 (374) Hytrel

4056 190 (374) Hytrel

4069 230 (446) Hytrel

4556 230 (446) Hytrel

5526 230 (446) Hytrel

5556 230 (446) Hytrel

6356 230 (446) Hytrel

7246 240 (464) HTR4275BK

230 (446) HTR5612BK

230 (446) HTR6108

190 (374) HTR8068

190 (374) HTR8171

190 (374) Figure 1. Melt Viscosity at Processing Temperature

1 103

102 10

10 102

103 104

104 Hytrel

4056 HTR6108 Hytrel

5526 Hytrel G4074 Hytrel G4774 Hytrel G5544 HTR8171 Hytrel

3078 Hytrel

4069 Hytrel

4556 Hytrel

5556 Hytrel

6356 Hytrel

7246 Apparent Viscosity, Pa・sec Shear Rate, secC1 { { { Hytrel G3548W HTR8068 HTR5612BK HTR4275BK}

3 Figure 3. Shear Melt Viscosity versus Temperature at a Shear Rate of

1000 secC1 Figure 4. Snake Flow at Processing Temperature Figure 5. Snake Flow at Processing Temperature

700 600

500 400

300 200 5,000 10,000 15,000 20,000

25 20

15 10 Channel Cross-section 12.7 mm x 2.54 mm (0.5 in x 0.10 in) Hytrel

5526 at 230?C Hytrel G4074 at 200?C Hytrel G3548W at 190?C Hytrel

4056 at 190?C Hytrel

5556 at 230?C Hytrel

6356 at 230?C Hytrel

7246 at 240?C Hytrel G4774 at 230?C Hytrel G5544 at 230?C Flow, mm Flow, in { { Injection Pressure, psi

200 100

0 10

5 0 5,000 10,000 15,000 20,000 Hytrel

4056 at 190?C Hytrel

5556 at 230?C Hytrel

6356 at 230?C Hytrel

7246 at 240?C Hytrel G4774 at 230?C Hytrel G5544 at 230?C Channel Cross-section 12.7 mm x 1.02 mm (0.5 in x 0.04 in) Hytrel G3548W at 190?C Hytrel G4074 at 200?C Hytrel

5526 at 230?C Injection Pressure, psi Flow, mm { { Flow, in Figure 2. Shear Melt Viscosity versus Temperature at a Shear Rate of

100 secC1

104 103

102 190 (374)

200 (392)

210 (410)

220 (428)

230 (446)

240 (464)

250 (482)

260 (500) HTR4275BK HTR5612BK Hytrel

5526 Hytrel G3548W Hytrel G4774 Hytrel G5544 Hytrel

4556 Hytrel

5556 Hytrel

6356 Hytrel

7246 Melt Temperature, ?C (?F) Apparent Viscosity, Pa・sec { { HTR8171 Hytrel

3078 { Hytrel

4069 HTR8068 Hytrel G4074 Hytrel

4056 HTR6108

104 103

102 190 (374)

200 (392)

210 (410)

220 (428)

230 (446)

240 (464)

250 (482)

260 (500) HTR4275BK HTR5612BK Hytrel

5526 Hytrel G4074 Hytrel G3548W Hytrel

4556 Hytrel

5556 Hytrel

6356 Hytrel

7246 Hytrel G4774 Hytrel G5544 Melt Temperature, ?C (?F) Apparent Viscosity, Pa・sec } { { { HTR8171 HTR8068 Hytrel

4056 HTR6108 Hytrel

4069 4 Figure 6. Apparent Melt Viscosity versus Temperature at a Shear Rate of

1000 secC1

360 400

440 480

520 560

180 200

220 240

260 280

300 103

104 8

6 4

2 8

6 4

2 103

102 8

6 4

2 8

6 4

2 102

10 Delrin

500 (acetal) Apparent Viscosity, P Apparent Viscosity, Pa・sec Melt Temperature, °C Delrin?

100 (acetal) Hytrel?

4056 Hytrel G3548W Hytrel G4074 Hytrel

5526 Zytel?

42 (nylon) Zytel

101 (nylon) Alathon

2005 (polyethylene) Alathon?

7240 (polyethylene) Hytrel

5556 Hytrel

6356 Hytrel

7246 { Melt Temperature, °F Hytrel G4774 Hytrel G5544 {

5 Handling Precautions All safety practices normally followed in the han- dling and processing of thermoplastic polymers should be followed for Hytrel polyester elastomer. The polymer is not hazardous under normal ship- ping and storage conditions. During processing, particularly if recommended temperatures and holdup times are exceeded to any great degree, Hytrel may degrade and decompose with evolution of gaseous products. Potential hazards from these gaseous decomposition products include blow- back through the hopper, fire, and exposure to toxic vapors (principally tetrahydrofuran). As with all thermoplastics, thermal burns from contact with molten polymer are a potential hazard. Before processing Hytrel, read bulletin Handling and Processing Precautions for Hytrel, and observe the precautions recommended therein. Compounding ingredients or additives may present hazards during handling and use. Before proceeding with any compounding or processing work, consult and follow label directions and handling precau- tions from suppliers of all ingredients, as per MSD sheets. For specific processing recommendations, please refer to the following publications: Bulletin Title HYT-201 Handling &