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
Low-functionality isocyanate based on hexamethylene diisocyanate (HDI).To improve the storage stability of pigmented moisture-curing one-component polyurethane coatings with good lightfastness and weather stability.
Applications
Beginning at 50 °C, Desmodur® LD reacts with water, releasing carbon dioxide and acting as a dewatering agent to ensure the storage stability of pigmented moisture-curing one-component polyurethane coatings.The stoichiometric conversion of 1 g water requires approx. 40 g Desmodur® LD. However, trials and actual use have shown that the best results are achieved using double to three times this quantity of Desmodur® LD.The reactivity of Desmodur® LD with water is comparable with that of the aliphatic Desmodur® E products. Drying of the pigments, extenders and solvents with Desmodur® LD must therefore be carried out before addition of the main binder to prevent undesired reactions and an increase in viscosity.In the ready-to-use formulation, the content of Desmodur® LD in the total binder should not exceed 30 %, calculated on the solvent-free resin.
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| NCO content | 12,1 ± 0,4 | % | M105-ISO 11909 | |
| Viscosity at 23 °C | 75 ± 15 | mPa*s | M014-ISO 3219/A.3 | |
| Color value (Hazen) | ≤ 50 | M017-EN 1557 | ||
| Monomeric HDI | ≤ 0,44 | % | M106-ISO 10283 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Equivalent weight | approx. 347 | |||
| Flash point | approx. 225 | °C | DIN EN ISO 2719 | |
| Density at 20 °C | approx. 1,0 | g/ml | DIN EN ISO 2811 |
Solubility / thinnability
Generally speaking, Desmodur® LD has good compatibility with the solvents listed. However, the solutions formed must be tested for their storage stability. Desmodur® LD can be dissolved in esters such as ethyl acetate, butyl acetate and 1-methoxypropylacetate-2. It has only limited solubility in aromatic hydrocarbons such as toluene, xylene, Solvesso® 100 and Shellsol® A. Above all, prolonged storage of solutions with a low binder content may result in turbidity and sedimentation. The product cannot be dissolved in white spirit.Alcohols react with Desmodur® LD and can therefore not be used.Only PU grade solvents (< 0.05 % water) should be used. The solvent should not contain reactive groups.
Compatibility
Generally speaking, Desmodur® LD has good compatibility with aliphatic polyisocyanate prepolymers such as Desmodur® E 3265 and Desmodur® ultra E 3370.
Storage
- Storage in original sealed Covestro container. - Recommended storage temperature: 0 - 30 °C. - Protect from moisture, heat and foreign material. General information: The product is sensitive to moisture. Storage at higher temperatures will result in increase of color and viscosity.
Storage time
Covestro represents that, for a period of nine 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 nine 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 nine 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 nine 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 .
