Covestro certifies that the product meets its specifications until the expiry date stated on the Certificate of Analysis, provided it has been stored and handled in accordance with Covestro’s specified conditions. Unless otherwise indicated, the expiry date is 6 months after quality control release. After expiry, product performance is not assured; customers are responsible for retesting material before use. Covestro makes no representations and assumes no liability for the product after the expiry date.
Product description
Baydur 726 IBS is a high-density polyurethane structural foam system used in the reaction injection molding (RIM) process.
Applications
Baydur 726 IBS is a high-density polyurethane structural foam system used in the reaction injection molding (RIM) process. This system incorporates a specially engineered interactive blowing system (IBS) and is supplied as two reactive liquid components. Component A is a modified polymeric diphenylmethane diisocyanate (PMDI) prepolymer blend, and Component B is a formulated polyol system containing no CFC- or HCFC-blowing additives. Baydur 726 IBS system is used in applications requiring a UL94 flammability rating* of V-0 and/or 5VA for use in electronic, equipment housing, and appliance markets. The applications typically take advantage of the material's strength, excellent surface finish, and large-part capability. As with any product, use of the Baydur 726 IBS system in a given application must be tested (including field testing, etc.) in advance by the user to determine suitability.
Typical Values
| Typical Properties* of the Components | |||||
| Property | Isocyanate (Component A) |
Polyol (Component B) |
UOM | ||
| Appearance | Dark brown liquid | Pale amber liquid | |||
| Specific gravity at 25°C | 1.24 | 1.108 | |||
| Dinamic viscosity at 25°C | 240 - 395 | 1000 | mPa•s | ||
| Flash point, PMCC | 213 | 161 | °C | ||
| Water | -- | 0.32 - 0.46 | %Wt | ||
| Hidroxyl number | -- | 482 - 512 | mg KOH/g | ||
| NCO | 26.6 - 27.4 | -- | %Wt | ||
| * These values provide general information and are not part of the product specification. | |||||
| Typical Physical Properties* of System | ||||||
| Property | ASTM Test Method (Other) |
Density (40 pcf) |
Density (45 pcf) |
Density (50 pcf) |
Density (55 pcf) |
Unit |
| Specific Gravity | D 792 | 0.64 | 0.72 | 0.8 | 0.88 | |
| Thickness | 0.25 | 0.25 | 0.25 | 0.25 | in | |
| Hardness | D 2240 | 66 | 70 | 74 | 81 | D Scale |
| Mold Shrinkage | Covestro | 0.7 - 0.9 | 0.7 - 0.9 | 0.7 - 0.9 | 0.7 - 0.9 | % |
| Tensile Strength at Break |
D 638 | 3100 | 3300 | 4600 | 4800 | lb/in2 |
| Elongation at Break | D 638 | 8 | 8 | 8 | 8 | % |
| Flexural Modulus | D 790 | 160000 | 190000 | 220000 | 240000 | lb/in2 |
| Flexural Strength | D 790 | 5600 | 7000 | 8200 | 9000 | lb/in2 |
| Charpy Impact | Covestro | 8 | 10 | 12 | 15 | ft • lb/in2 |
| Deflection Temperature Under Load: 66 psi | D 648 | 83 (181) | 93 (199) | 96 (205) | 100 (212) | °C (°F) |
| UL94 Flame Class | UL 94 | V-0/5VA | V-0/5VA | V-0/5VA | V-0/5VA | Rating |
| Flammability** FMVSS 302 |
FMVSS 302 | Pass | Pass | Pass | Pass | |
| *These items are provided as general information only. They are approximate values and are not part of the product specifications. ** Flammability results are based on small-scale laboratory tests for purposes of relative comparison and are not intended to reflect the hazards presented by this or any other material under actual fire conditons. |
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Storage
Component A (PMDI isocyanate blend) will react with moisture and must be stored in tightly closed containers and protected from contamination with moisture and other foreign materials, which can adversely affect processing. It will react slowly with water to form polyureas and carbon dioxide gas, which may cause sealed containers to expand and rupture. Storage temperatures should be maintained between 17° and 30°C (62° and 86°F). Component B (polyol system) is hygroscopic and may absorb water. Containers must be kept closed and protected from moisture and foreign materials which can adversely affect processing. Recommended storage temperature is between 4° and 38°C (39° and 100°F). Note: Component B phase separates upon standing and must be mixed thoroughly via mechanical means prior to use.
Storage time
Processing
| Processing Conditions* | ||||
| Hand mix Reactivity at 25 °C: | Value | Unit | ||
| Cream Time | 13 - 23 | sec | ||
| Gel Time | 27 - 37 | sec | ||
| Tack Free Time | 26 - 36 | sec | ||
| Free Rise Density | 15 - 19 | lb/ft³ | ||
| Machine Reactivity at 30°C: | Value | Unit | ||
| Cream Time | 6 - 12 | sec | ||
| Gel Time | 15 - 19 | sec | ||
| Tack Free Time | 19 - 22 | sec | ||
| Free Rise Density | 15 - 20 | lb/ft³ | ||
| Polyol Nucleation: Specific Gravity | 0.80 - 0.85 | |||
| Maximum Shot Time | 7 | sec | ||
| Recommended Demold Time, 0.250 inch thickness | 3 - 4 | min | ||
| Molding Parameters | Value | Unidad | ||
| Material Temperature | 32 - 35 (90 - 95) | °C (°F) | ||
| Mold Temperature | 66 - 76 (150 - 170) | °C (°F) | ||
| Mix Ratio, 110 Index | Isocyanate (Component A) |
Polyol (Component B) |
||
| By Weight | 155 | 100 | ||
| By Volume | 140 | 100 | ||
| * These values provide general information and are not part of the product specification. | ||||
Health and Safety Information
Before working with this product, you must read and become familiar with the available information regarding its risks, proper use, and safe handling. This information is provided in various formats, including the current Safety Data Sheet (SDS) and product label. SDS can be accessed via the following link:
Safety Data Sheets (SDS) for Covestro products | Covestro
For further questions, please use the contact information provided on this technical data sheet.
Disclaimer
Responsibility and Liability
The use of Covestro products, technical assistance, and information (regardless of how provided) is outside Covestro’s control and is solely the responsibility of the customer. The customer must conduct adequate testing to determine the suitability of products for its intended use, including but not limited to technical, health, safety, and environmental aspects. Unless otherwise agreed in writing, all products are sold exclusively under Covestro’s standard conditions of sale, which prevail in case of conflict and are available upon request.
The terms and conditions of sale and delivery are available via the following link:
https://order.covestro.com/covestrostorefront/saleConditions
All information is provided “as is” without warranties, express or implied, including merchantability or fitness for a particular purpose, and is subject to change without notice. To the maximum extent permitted by law, Covestro disclaims, and the customer assumes all liability for losses, damages, or claims arising out of use of Covestro products, technical assistance, or information. Any statement or recommendation not expressly contained in Covestro documentation is unauthorized and shall not bind Covestro. Nothing herein shall be construed as encouraging or recommending the use of any product in conflict with any claim of any patent. No license is implied or in fact granted under the claims of any patent.
Restrictions on Regulated Applications
This product is not intended for use in regulated applications such as agriculture, cosmetics, drinking water contact, food contact, medical products (e.g., medical devices), toys, or similar uses subject to specific regulatory requirements. Prior written approval from Covestro is required before this product may be used in any regulated application. The customer is solely responsible for ensuring compliance with all applicable laws and determining product suitability. Covestro disclaims all liability and warranties for unauthorized regulated uses.
Typical Value
The values provided are typical only and do not represent binding specifications. Unless expressly confirmed in a written contract, these values are not part of the contractual quality agreement and must not be relied upon as a warranty or guarantee of product performance.
Sample
Samples provided by Covestro are intended solely for evaluation and testing purposes by the customer and may not be used in commercial applications, resold, transferred to third parties (except qualified testing service providers acting on behalf of the customer), reverse engineered, modified, or used in any manner not explicitly authorized in writing by Covestro. Samples are provided ‘as-is’ without any warranties, express or implied, including fitness for a particular purpose. Customers are solely responsible for ensuring safe handling, regulatory compliance, and suitability of the material for their intended evaluations. Covestro disclaims all liability for damages or losses arising from the use of samples.
Contact Information
Please use our contact form or contact us directly by sending an e-mail to technical-datasheets@cx.covestro.com .
