Top Grade Material Vacuum Casting TPU

Short Description:

Hei-Cast 8400 and 8400N are 3 component type polyurethane elastomers used for vacuum molding applications which have the following characteristics:

(1) Through the use of “C component” in the formulation, any hardness in the range of Type A10~90 can be obtained/selected.
(2) Hei-Cast 8400 and 8400N are low in viscosity and show excellent flow property.
(3) Hei-Cast 8400 and 8400N cure very well and exhibit excellent rebound elasticity.


Product Detail

Product Tags

Basic Properties

Item Value Remarks
Product 8400 8400N
Appearance A Comp. Black Clear,colorless Polyol(Freezes below 15°C)
B Comp. Clear, pale yellow Isocyanate
C Comp. Clear, pale yellow Polyol
Color of article Black Milky white Standard color is black
Viscosity    (mPa.s 25°C) A Comp. 630 600 Viscometer Type BM
B Comp. 40
C Comp. 1100
Specific gravity(25°C) A Comp. 1.11 Standard Hydrometer
B Comp. 1.17
C Comp. 0.98
Pot life 25°C 6min. Resin 100g
6min. Resin 300g
35°C 3min. Resin 100g

Remarks:A component freezes at temperatures below 15°C. Melt by heating and use after shaking it well.

3.Basic physical properties  ≪A90 A80 A70 A60≫

Mixing ratio A:B:C 100:100:0 100:100:50 100:100:100 100:100:150
Hardness Type A 90 80 70 60
Tensile strength MPa 18 14 8.0 7.0
Elongation % 200 240 260 280
Tear strength N/mm 70 60 40 30
Rebound Elasticity % 50 52 56 56
Shrinkage % 0.6 0.5 0.5 0.4
Density of final product g/cm3 1.13 1.10 1.08 1.07

4.Basic physical properties  ≪A50 A40 A30 A20≫

Mixing ratio A:B:C 100:100:200 100:100:300 100:100:400 100:100:500
Hardness Type A 50 40 30 20
Tensile strength MPa 5.0 2.5 2.0 1.5
Elongation % 300 310 370 490
Tear strength N/mm 20 13 10 7.0
Rebound Elasticity % 60 63 58 55
Shrinkage % 0.4 0.4 0.4 0.4
Density of final product g/cm3 1.06 1.05 1.04 1.03

5.Basic physical properties  ≪A10≫

Mixing ratio A:B:C 100:100:650
Hardness Type A 10
Tensile strength MPa 0.9
Elongation % 430
Tear strength N/mm 4.6
Shrinkage % 0.4
Density of final product g/cm3 1.02

Remarks: Mechanical properties:JIS K-7213.   Shrinkage:Inhouse specification.
Curing condition: Mold temperature:600C   600C x 60 min.+ 60°C x 24hrs. + 250C x 24 hrs.
Physical  properties listed above are typical values measured  in our laboratory and not the values for specification. When using our product, it must be noted that physical properties of final product may differ depending on the contour of article and the molding condition.

6. Resistance against heat, hot water and oil ≪A90 ・ A50 ・ A30≫

(1) Heat resistance【kept in 80°C thermostatic oven with circulating warm air

 

 

 

A90

Item Unit Blank 100 hrs 200 hrs 500 hrs
Hardness Type A 88 86 87 86
Tensile strength MPa 18 21 14 12
Elongation % 220 240 200 110
Tear resistance N/mm 75 82 68 52
Surface condition     No change

 

 

 

 

A60

Item Unit Blank 100 hrs 200 hrs 500 hrs
Hardness Type A 58 58 56 57
Tensile strength MPa 7.6 6.1 6.1 4.7
Elongation % 230 270 290 310
Tear resistance N/mm 29 24 20 13
Surface condition     No change

 

 

 

 

A30

Item Unit Blank 100 hrs 200 hrs 500 hrs
Hardness Type A 27 30 22 22
Tensile strength MPa 1.9 1.5 1.4 1.3
Elongation % 360 350 380 420
Tear resistance N/mm 9.2 10 6.7 6.0
Surface condition     No change

Remarks:Curing condition: Mold temperature:600C   600C x 60 min.+ 60°C x 24hrs. + 250C x 24 hrs.          
Physical properties are measured after leaving exposed samples at 250C for 24 hrs. Hardness, tensile strength and tear Strength are tested according to JIS K-6253, JIS K-7312 and JIS K-7312 respectively.

(2) Heat resistance【kept in 120°C thermostatic oven with circulating warm air】

 

 

 

A90

Item Unit Blank 100 hrs 200 hrs 500 hrs
Hardness Type A 88 82 83 83
Tensile strength MPa 18 15 15 7.0
Elongation % 220 210 320 120
Tear resistance N/mm 75 52 39 26
Surface condition     No change

 

 

 

 

A60

Item Unit Blank 100 hrs 200 hrs 500 hrs
Hardness Type A 58 55 40 38
Tensile strength MPa 7.6 7.7 2.8 1.8
Elongation % 230 240 380 190
Tear resistance N/mm 29 15 5.2 Not measurable
Surface condition     No change Melt and tack

 

 

 

 

A30

Item Unit Blank 100 hrs 200 hrs 500 hrs
Hardness Type A 27 9 6 6
Tensile strength MPa 1.9 0.6 0.4 0.2
Elongation % 360 220 380 330
Tear resistance N/mm 9.2 2.7 0.8 Not measurable
Surface condition     Tack Melt and tack

(3) Hot water resistance【immersed in 80°C tap water】

 

 

 

A90

Item Unit Blank 100 hrs 200 hrs 500 hrs
Hardness Type A 88 85 83 84
Tensile strength MPa 18 18 16 17
Elongation % 220 210 170 220
Tear resistance N/mm 75 69 62 66
Surface condition     No change

 

 

 

 

A60

Item Unit Blank 100 hrs 200 hrs 500 hrs
Hardness Type A 58 55 52 46
Tensile strength MPa 7.6 7.8 6.8 6.8
Elongation % 230 250 260 490
Tear resistance N/mm 29 32 29 27
Surface condition     No change

 

 

 

 

A30

Item Unit Blank 100 hrs 200 hrs 500 hrs
Hardness Type A 27 24 22 15
Tensile strength MPa 1.9 0.9 0.9 0.8
Elongation % 360 320 360 530
Tear resistance N/mm 9.2 5.4 4.9 4.2
Surface condition     Tack

(4) Oil resistance【Immersed in 80°C engine oil】

 

 

 

A90

Item Unit Blank 100 hrs 200 hrs 500 hrs
Hardness Type A 88 88 89 86
Tensile strength MPa 18 25 26 28
Elongation % 220 240 330 390
Tear resistance N/mm 75 99 105 100
Surface condition     No change

 

 

 

 

A60

Item Unit Blank 100 hrs 200 hrs 500 hrs
Hardness Type A 58 58 57 54
Tensile strength MPa 7.6 7.9 6.6 8.0
Elongation % 230 300 360 420
Tear resistance N/mm 29 30 32 40
Surface condition     No change

 

 

 

 

A30

Item Unit Blank 100 hrs 200 hrs 500 hrs
Hardness Type A 27 28 18 18
Tensile strength MPa 1.9 1.4 1.6 0.3
Elongation % 360 350 490 650
Tear resistance N/mm 9.2 12 9.5 2.4
Surface condition     Swelling

 (5) Oil resistance【Immersed in gasoline】

 

 

 

A90

Item Unit Blank 100 hrs 200 hrs 500 hrs
Hardness Type A 88 86 85 84
Tensile strength MPa 18 14 15 13
Elongation % 220 190 200 260
Tear resistance N/mm 75 60 55 41
Surface condition     Swelling

 

 

 

 

A60

Item Unit Blank 100 hrs 200 hrs 500 hrs
Hardness Type A 58 58 55 53
Tensile strength MPa 7.6 5.7 5.1 6.0
Elongation % 230 270 290 390
Tear resistance N/mm 29 28 24 24
Surface condition     Swelling

 

 

 

 

A30

Item Unit Blank 100 hrs 200 hrs 500 hrs
Hardness Type A 27 30 28 21
Tensile strength MPa 1.9 1.4 1.4 0.2
Elongation % 360 350 380 460
Tear resistance N/mm 9.2 6.8 7.3 2.8
Surface condition     Swelling

(6)Chemical resistance

Chemicals Hardness Loss of gloss Discolor ation Crack Warpa ge Swell

ing

Degra

dation

Dissolu tion
 

Distilled water

A90
A60
A30
 

10%Sulfuric acid

A90
A60
A30
 

10%Hydrochloric acid

A90
A60
A30
 

10%Sodium

hydroxide

A90
A60
A30
 

10%Ammonia

water

A90
A60
A30
 

Acetone*1

A90
A60 ×
A30 ×
 

Toluene

A90 ×
A60 × ×
A30 × × ×
 

Methylene

chloride*1

A90 ×
A60 ×
A30 ×
 

Ethyl acetate*1

A90
A60 ×
A30 ×
 

Ethanol

A90 ×
A60 ×
A30 × ×

Remarks:Changes after 24 hrs. immersion in each chemicals were observed. Those marked with *1 mark were immersed for 15 min. respectively.

8. Vacuum Molding Process

(1) Weighing
Decide the amount of "C component" according to the hardness you desire and add it to A component.
Weigh the same amount by weight of B component as A component in a separate cup taking into account the amount which may remain in the cup.

(2)  Pre-degassing
Perform pre-degassing in degassing chamber for about 5 minutes.
Degass as much as you need.
We recommend to degass after heating material to a liquid temperature of 25~35°C.

(3) Temperature of resin                                                                                     
Keep temperature of 25~35°C for both A (containing C component) and B  component.
When the temperature of material is high, the pot life of mixture will become short and when the temperature of material is low, the pot life of mixture will become long.

(4)  Mold temperature
Keep temperature of silicone mold pre-heated to 60 ~ 700C.
Too low mold temperatures may cause improper curing to result in lower physical properties.   Mold temperatures should be controlled precisely as they will affect the dimensional accuracy of the article.

(5) Casting
Containers  are  set  in  such  a  way  that  B  component  is  added  to  A component (containing C component).
Apply vacuum to the chamber and de-gass A component for 5 ~ 10 minutes while it is stirred from time to time.                                                                                                 

Add B component to A component (containing C component)   and stir for 30 ~ 40 seconds and then cast the mixture speedily into the silicone mold.
Release vacuum in 1 and half a minute after commencement of the mixing.

(6) Curing condition
Place  filled  mold  in  thermostatic  oven  of 60  ~  700C  for  60  minutes  for  Type  A hardness 90 and for 120 minutes for Type A hardness 20 and demold.
Perform post curing at 600C for 2 ~ 3 hours depending on the requirements.

9. Flow chart of vacuum casting

 

10. Precautions in handling

(1) As all A, B and C component are sensitive to water, never allow water get into the material.  Also  refrain  from  material  coming  long  contact  with  moisture.  Close container tight after each use.

(2)  Penetration of water into A or C component may lead to generation of much air bubbles in the cured product and if this should happen, we recommend to heat A or C component to 80°C and degass under vacuum for about 10 minutes.

(3) A component will freeze at temperatures below  15°C. Heat to 40~50°C and use after shaking it well.

(4) B component will react with moisture to become turbid or to cure into solid material. Do  not use the  material when  it has lost the transparency or it has shown any hardening as these materials will lead to much lower physical properties.

(5)  Prolonged heating of B component at temperatures over 50°C will affect quality of B component and the cans can be inflated by the increased inner pressure. Store at room temperature.

 

11. Precautions in Safety and Hygiene

(1)  B component contains more than 1% of 4,4'-Diphenylmethane diisocyanate. Install local exhaust within the work shop to secure good ventilation of the air.

(2) Take care that hands or skin are not coming in direct contact with raw materials. In case of contact, wash with soap and water immediately.   It may irritate hands or skin if they are left in contact with raw materials for longer period of time.

(3)  If raw materials get into eyes, rinse with flowing water for 15 minutes and call a doctor.

(4)  Install duct for vacuum pump to ensure that air is exhausted to the outside of the work shop.

 

12. Dangerous Materials Classification according to the Fire Services Act           

A Component: Third Petroleum Group, Dangerous Materials Fourth Group.   

B Component: Fourth Petroleum Group, Dangerous Materials Fourth Group.

C Component: Fourth Petroleum Group, Dangerous Materials Fourth Group.

 

13. Delivery Form

A Component: 1 kg Royal can.

B Component: 1 kg Royal can.

C Component: 1 kg Royal can.


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