H&K Ltd. TECHNICAL INFORMATIONISSUE 20210308-WI-10-8571A/8570B-20210407-P1/4***** Hei-Cast 8571A/8570B *****

1. Overview
Hei-Cast 8571A/8570B is a polyurethane resin material developed for prototype production of PE andPP.
(1) It is highly curable and can be demolding at 60°C for 30 minutes even in thin-walled products.
(2) It does less damage to silicone mold.
2. Basic characteristics
Item

Appearance

ValuesA Component

8571A C

Colorless

8571A BLACKBlackB Component 8570B
Product ColorPale yellow turbid

Polyols
IsocyanatesMilky white/black

Viscosity(mPa･s,25℃)

A Component

800

B Component

300

Specific gravity(25℃)

A Component

1.12

B Component

1.18

Mixing ratio

A:B

100:200

25℃

5 min 45 sec

35℃

4 min.

P o tNotesl i f eBM
type viscometerStandard pycnometer
By weight
Resin 100 g

Product specific gravity

1.21

JIS K 7112

Demolding Time

30 min.

Mold temperature 60°C
or higher(0.5-1mm thickness)

3. Basic physical properties
Item

30 minutes cure

60 minutes cureNotesHardness

Type D8284

Tensile strengthMPa4951

Elongation%

4030

Flexural strength

MPa

5859

Bending modulus

MPa

1490

1400

Impact value

kJ/㎡

1415

JIS K 7110 Izod V Notch

Shrinkage rate%

0.4

0.4

In-house standards

Deflection temperature
under load℃

78

83

JIS K 7191(1.80 MPa)

83

92

JIS K 7191(0.45 MPa)

H&K Ltd.

JIS K-7215
JIS K 7113

JIS K 7171

2-19-6 Yanagibashi Taito-ku Tokyo Japan 111-0052 TEL 03-3865-3690 URL: http://www.heisengp.co.jp/

H&K Ltd. TECHNICAL INFORMATIONISSUE 20210308-WI-10-8571A/8570B-20210407-P2/4

NOTE) Test specimen curing conditions: Mold temperature 60°C 60°C x 30 min + 25°C x 24 h
Mold temperature 60°C 60°C x 60 min + 25°C x 24 hThis physical property value is representative of our measurements and is not a specification value.
The physical properties of the product vary depending on the shape and molding conditions. Please use
the product after thoroughly checking it.

4. Vacuum casting method(1) Pre-degassing
Perform preliminary degassing in the degassing chamber for about 5 minutes.
Be sure to degas only the amount used.
It is recommended to be degassed at 40°C to 50°C of the liquid temperature.
(2) Resin temperature
Keep the component temperature at about 35°C to 45°C for both A component and B component
during casting.
If the liquid temperature is high, the pot life will be shortened, and if it is low, it will be longer.
Extremely low liquid temperatures can lead to poor mixing or poor curing.
(3) Mold temperature
Keep the silicone mold temperature between 60 and 70°C in advance.
If the mold temperature is low, curing failure may occur, resulting in deterioration of physicalproperties.
Also, the mold temperature affects the dimensions of the product, so please manage it thoroughly.
(4) CastingSet the container so that A component is added to B component.
Stir and defoam the B component occasionally for about 5 to 10 minutes while the working room
is evacuated.
Add A component to B component, stir for 40-60 seconds, and quickly pour into the silicone moldand do the leak.
Do the leak in 1 minute to 1 minute 30 sec after starting mixing.
(5) Curing conditions
Place it in a thermostatic chamber of 60-70°C, and then demolding it after 30-60 minutes of curing.
If necessary, perform secondary curing at 70°C to 80°C for 2 to 3 hours.

H&K Ltd.

2-19-6 Yanagibashi Taito-ku Tokyo Japan 111-0052 TEL 03-3865-3690 URL: http://www.heisengp.co.jp/

H&K Ltd. TECHNICAL INFORMATIONISSUE 20210308-WI-10-8571A/8570B-20210407-P3/4

5. Vacuum casting flow chart
A Liquid
Resin temperature: 40°C to50°C

B Liquid
Resin temperature: 40°C to50°C

Weighing
A:B=100:200

Weighing
A:B=100:200

Pre-degassing
About 5 minutes

Pre-degassing
About 5 minutes

Silicone mold
Mold temperature: 60-70°C

Set on the vacuum casting unit resin temperature : 35 to 45°C
Vacuum degassing for 5 to 10 minutes

Mixing40～60 sec.

casting/leak
1 min to 1 min 30 sec.

Curing60-70 °C × 30-60 min.

De-molding

6. Handling precautions(1) Both A component and B component dislike moisture. Avoid not only water mixture but also longcontact with moisture. Always seal them after use.
(2) If moisture gets into A component, many bubbles will be generated in the cured product.
(3) B component may react with moisture and become cloudy or hardened. Do not use such material
that is spoiling transparency extremely or hardened, as they may cause deterioration in physicalproperties.
(4) If B component is stored at 5°C or below for a long period of time, some or all of it may freeze andsolidify. Warm the material and dissolve at 60°C to 70°C for 1 to 2 hours. Mix evenly before use.
(5) If B component is heated at 50°C or above for a long period of time, it may deteriorate and thecontainer may swell by internal pressure. When the material which freezes is stored at room
temperature, the deterioration will be accelerated. Fully melt and store at 20 to 25°C.
7. Safety and health precautions(1) B component contains 1% or more of 4,4'-diphenylmethane diisocyanate. Provide a local exhaust
ventilation system in the work area and be careful of ventilation.
(2) Be careful not to touch the ingredients directly with your hands or skin. In case of contact, wash
H&K Ltd.

2-19-6 Yanagibashi Taito-ku Tokyo Japan 111-0052 TEL 03-3865-3690 URL: http://www.heisengp.co.jp/

H&K Ltd. TECHNICAL INFORMATIONISSUE 20210308-WI-10-8571A/8570B-20210407-P4/4

them off immediately with soapy water. Leaving it in contact for a long time may cause rash.
(3) If the ingredients get into the eyes, immediately wash the eyes with running water for 15 minutes
and consult an ophthalmologist.
(4) Provide a duct so that exhaust air from the vacuum pump is discharged outdoors without fail.
8. Fire Defense Law Hazardous Materials Classification
A component : Dangerous Substances, Group 4, Class 4 Petroleum
B component : Dangerous Substances, Group 4, Class 4 Petroleum

H&K Ltd.

2-19-6 Yanagibashi Taito-ku Tokyo Japan 111-0052 TEL 03-3865-3690 URL: http://www.heisengp.co.jp/