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.
Product description
Branched hydroxyl-bearing polyester.As a co-reactant for Desmodur® N/ultra N in the formulation of two-component polyurethane coatings with good gloss retention, lightfastness and chalking resistance.Also in combination with Desmodur® L/ultra L and HL in the formulation of fast-drying two-component coatings.
Applications
Desmophen® 680 BA is a hard co-reactant for use with Desmodur® N/ultra N. The drying properties of this combination are comparable with those of the acrylic resin/Desmodur® N/ultra N systems developed specially for automotive repair paints. It is therefore particularly suitable for the formulation of air-drying automotive and industrial coatings. Coatings crosslinked with Desmodur® L/ultra L and HL are particularly fast-drying, making them suitable for applications such as paper finishing.Desmophen® 680 BA/Desmodur® N/ultra N combinations can be formulated with and without the use of catalysts. Non-catalysed formulations are tack-free after approx. 4 hours at room temperature. They can be overcoated after 16 hours and are resistant to premium-grade petrol after 3 days. Overcrosslinking slows drying to the tack-free stage but improves solvent resistance. The cured paint films are hard but flexible, high-gloss and high-bodied and have good weather stability and lightfastness.
Form supplied
approx. 70 % in butyl acetate
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Hazen color value | ≤ 200 | DIN EN 1557 | ||
| Acid value | 16 ± 3 | mg KOH/g | DIN EN ISO 2114 | |
| Viscosity at 23°C | 3,000 ± 500 | mPa*s | DIN EN ISO 3219/A.3 | |
| Non-volatile content | 2 g resin/2 ml toluene/ 1 h 125 °C, convection oven | 70 ± 1 | % | DIN EN ISO 3251 |
| Hydroxyl content | 2,2 ± 0,5 | % | DIN EN ISO 4629-2 | |
| Water content | ≤ 0,1 | % | DIN 51 777/1 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Equivalent weight | approx. 770 | |||
| Density at 20°C | approx. 1,08 | g/ml | DIN EN ISO 2811-2 | |
| Flash point | approx. 32 | °C | DIN EN ISO 2719 | |
| Alternative raw material share | 1) bio-based | approx. 15 | wt.-% | calculated |
| Alternative carbon share | 1) bio-based | approx. 18 | % | calculated |
Solubility / thinnability
Desmophen® 680 BA can be thinned with esters, ketones and aromatic hydrocarbons such as ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, 1-methoxypropylacetate-2, toluene, xylene, solvent naphtha® 100 and mixtures thereof. However, the solutions formed must be tested for their storage stability.Aliphatic hydrocarbons cannot be used as solvents.Only PU grade solvents should be used (< 0.05 % water, free from other reactive impurities).Desmophen® 680 BA should not be thinned to below a solids content of 30 %. Solutions with a lower binder content in some solvents may result in turbidity.
Compatibility
Generally speaking, Desmophen® 680 BA is miscible with the Desmodur® and Desmophen® grades listed. However, the combinations must be tested for their compatibility. Desmophen® 680 BA can be mixed with Desmodur® L/ultra L, HL, N/ultra N and Z 4470, with polyester-based Desmophen® grades such as Desmophen® 670, 690 and 881 X. It is incompatible with Desmophen® 650. Compatibility with Acrylic resins has to be checked.
Storage
- Storage in original sealed Covestro container. - Recommended storage temperature: max. 30 °C. - Protect from moisture, heat and foreign material.
Storage time
Covestro represents that, for a period of six months following the day of shipment as stated in the respective transport documents, the product will meet the specifications or values set forth in section "specifications or characteristic data" above, what ever is applicable, 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 lapse of the six months period does not necessarily mean that the product no longer meets specifications or the set values. However, prior to using said product, Covestro recommends to test such a product if it still meets the specifications or the set values. Covestro does not make any representation regarding the product after the lapse of the six months period and Covestro shall not be responsible or liable in any way for the product failing to meet specifications or the set values after the lapse of the six months period.
Health and Safety Information
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 .
