Covestro represents that the product will meet the specifications or values set forth in section "specifications or typical value" above, whatever is applicable, until the expiry date mentioned on the Certificate of Analysis provided that the product is stored in full compliance with the storage conditions set forth in and referenced under section "storage" above and is otherwise handled appropriately. The expiry date is typically 6 months (180 days) after last quality control unless specified otherwise on the Certificate of Analysis. If the expiry date is met it does not necessarily mean that the product no longer meets specifications or the set values. However, prior to using said product, Covestro recommends testing such a product if it still meets the specifications or the set values. Covestro does not make any representation regarding the product after the expiry date is met and Covestro shall not be responsible or liable in any way for the product failing to meet specifications or the set values after the expiry date is met.
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 on its risks, proper use, and handling. Information is available in several forms, e.g., in particular in the currently valid safety data sheets and product labels. For further information contact your Covestro representative.
Disclaimer
General
The manner in which you use our products, technical assistance and information (whether verbal, written or by way of production evaluations), including any suggested formulations and recommendations, are beyond our control. Therefore, it is imperative that you test our products to determine suitability for your processing and intended uses. Your analysis must at least include testing to determine suitability from a technical, health, safety, and environmental and regulatory standpoint. Such testing has not necessarily been done by Covestro, and Covestro has not obtained any approvals or licenses for a particular use or application of the product.
Unless we otherwise agree in writing, all products are sold strictly pursuant to the terms of our standard conditions of sale which are available upon request.
All information and including technical assistance is given without warranty or guarantee and is subject to change without notice. It is expressly understood and agreed by you that you assume and hereby expressly release indemnify us and hold us harmless from all liability, in tort, contract or otherwise, incurred in connection with the use of our products, technical assistance, and information. Any statement or recommendation not contained herein is unauthorized and shall not bind us. Nothing herein shall be construed as a recommendation to use any product in conflict with any claim of any patent relative to any material or its use. No license is implied or in fact granted under the claims of any patent.
Non Medical and non Food Contact
This product is not designated for the manufacture of a medical device or of intermediate products for medical devices (1). This product is also not designated for other specifically regulated applications (e.g. including cosmetics, plant protection, fertilisers, plant strengtheners, food processing, food contact and others). If the intended use of the product is for the manufacture of a medical device or of intermediate products for medical devices or for other specifically regulated applications Covestro must be contacted in advance to provide its agreement to sell such product for such purpose. Nonetheless, any determination as to whether a product is appropriate for use in a medical device or intermediate products for medical devices, for Food Contact products or cosmetic applications must be made solely by the purchaser of the product without relying upon any representations by Covestro.
1) Please see the Guidance on Use of Covestro Products in a Medical Application document.
Sample
Any samples provided by Covestro are for testing purposes only and not for commercial use.
Typical value
These values are typical values only. Unless explicitly agreed in written form, they do not constitute a binding material specification or warranted values
Contact Information
Please use our contact form or contact us directly by sending an e-mail to technical-datasheets@cx.covestro.com .
