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BJB Polyurethane WC-781 A/B
| Category: | PUR, Unspecified , Polyurethane |
| Manufacturer: | BJB Enterprises, Inc. |
| Trademark: | BJB Polyurethane |
| Fillers: | - |
| Ports: | Qinzhou, Shekou, Shanghai, Ningbo |
| Delivery Terms | FOB, CIF, DAP, DAT, DDP |
| PDF: | HNgVZS_BJB-Polyurethane-WC-781-A-B.pdf  |
| PRICE: | Order Products email sales@su-jiao.com |
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WC-781 A/B is an impact resistant, rigid, 82 Shore D material that is commonly used to make clear or tinted castings of all kinds. When used at room temperature, castings 1/4" thick or larger can be readily cast. Castings that are less than 1/4" thick generally require a pre-warming of materials, molds, and a mild post-cure. Product Highlights:
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| General Information | |
|---|---|
| Features |
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| RoHS Compliance |
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| Appearance |
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| Forms |
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| Processing Method |
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| Physical | Nominal Value | Unit | Test Method |
|---|---|---|---|
| Specific Gravity | |||
| Part A | 1.057 | g/cm³ | |
| Part B | 1.027 | g/cm³ | |
| Contractility (1.27cm) 1 | 0.40 | % |
| Thermoset | Nominal Value | Unit | |
|---|---|---|---|
| Demold Time (25°C) | 1.0 | day | |
| Work Time (25°C) 2 | 30.0 | min |
| Fill Analysis | Nominal Value | Unit | |
|---|---|---|---|
| Brokfield Viscosity | |||
| Mixed : 25°C | 600 - 700 | mPa·s | |
| Part A : 25°C | 650 | mPa·s | |
| Part B : 25°C | 550 | mPa·s |
| Additional Information | Nominal Value | Unit | |
|---|---|---|---|
| Cure Time (25°C) | 5.0 - 7.0 | day |
| Physical | Nominal Value | Unit | Test Method |
|---|---|---|---|
| Density | 1.05 | g/cm³ | ASTM D792 |
| Hardness | Nominal Value | Unit | Test Method |
|---|---|---|---|
| Durometer Hardness (Shore D) | 80 - 84 | ASTM D2240 |
| Mechanical | Nominal Value | Unit | Test Method |
|---|---|---|---|
| Tensile Modulus | 1790 | MPa | ASTM D638 |
| Tensile Strength (Yield) | 45.9 | MPa | ASTM D638 |
| Tensile Elongation (Yield) | 65 | % | ASTM D638 |
| Flexural Modulus | 2210 | MPa | ASTM D790 |
| Flexural Strength | 75.8 | MPa | ASTM D790 |
| Compressive Modulus | 2410 | MPa | ASTM D695 |
| Compressive Strength | 57.6 | MPa | ASTM D695 |
| Impact | Nominal Value | Unit | Test Method |
|---|---|---|---|
| Notched Izod Impact | 53 | J/m | ASTM D256 |
| Thermal | Nominal Value | Unit | Test Method |
|---|---|---|---|
| Deflection Temperature Under Load (0.45 MPa, Unannealed) | 70.0 | °C | ASTM D648 |
| Thermoset | Nominal Value | Unit | |
|---|---|---|---|
| Thermoset Components | |||
| Component a | Mixing ratio by weight: 100, mixing ratio by capacity: 100 | ||
| Component B | Mixing ratio by weight: 85, mixing ratio by capacity: 88 | ||
| Shelf Life | 26 | wk |
| Additional Information | Nominal Value | Unit | |
|---|---|---|---|
| In order to achieve maximum physical properties, a post cure with heat is required. BJB recommends 24 hours at ambient temperature, 77°F (25°C), followed by 16 hours at 150-180°F (66-82°C). Support of the part may be required to prevent part deformation during the heat curing process. |
| Note Message | |
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| 1 . | 12"x1/2"x1/2" |
| 2 . | 100g mass |
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