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.
Product description
Desmodur® VKS 20 is a mixture of diphenylmethane-4,4'-diisocyanate (MDI) with isomers and higher functional homologues (PMDI).Desmodur® VKS 20 is a mixture of monomeric polyisocyanates that is suitable for combination with Baycoll® in the formulation of adhesives.
Applications
Desmodur® VKS 20 can be combined with Baycoll in the formulation of adhesives for bonding many materials, e.g. wood, metal and plastics. Desmodur® VKS 20 is particularly suitable for combining with Baycoll in the formulation of reactive two-component adhesives and moisture-curing one-component adhesives.On account of the vapor pressure of MDI, especially at elevated temperatures, adhesives with free isocyanate groups can only be handled in work areas with adequate extraction.
Form supplied
Solvent-free, dark brown liquid of low viscosity at temperatures above 10 °C that may partially crystallize at lower temperatures.
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| NCO | 31,5 ± 1,0 | % | MDI-01-01 | |
| Viscosity | (25 °C) | 200 ± 40 | mPa*s | MDI-01-02 |
| Acidity | (HCl) | max. 200 | mg/kg | MDI-01-03 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Density | at 20 °C | approx. 1,2 | g/cm3 | DIN 51 757 |
| Vapor pressure | at 20 °C (MDI) | < 10^5 | hPa | |
| Phenyl isocyanate content | max. 50 | mg/kg | MDI-01-08 |
Storage
- Storage in original sealed Covestro container. - Recommended storage temperature: 10 - 30 °C. - Protect from moisture, heat and foreign material. General information: The product is sensitive to moisture and should therefore be stored in its sealed original containers.
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.
Processing
Desmodur® VKS 20 may partially crystallize at temperatures below 10 °C. However, this may by reversed. The crystalline deposits can be reliquefied by careful heating to 70 °C for as briefly as possible, although this may cause an increase in the solids content.It must be ensured that the containers - including those that are empty - are kept sealed. Above all, contact with water must be prevented as it reacts with Desmodur® VKS 20 to form polyureas and carbon dioxide. During storage, sample withdrawal, transfer and processing of Desmodur® VKS 20, the ingress of water in any form (damp containers, anhydrous solvents, moist air) must be prevented as otherwise the formation of carbon dioxide may cause a dangerous increase in pressure in the tanks and containers. Furthermore, the formation of polyureas in Desmodur® VKS 20 may cause turbidity and possibly solid deposits which may then block filters, pumps and pipelines.
Health and Safety Information
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
Please use our contact form or contact us directly by sending an e-mail to technical-datasheets@cx.covestro.com .
