CRA® 21 is an extremely efficient controlled release additive for adjusting the release force of solvent-based DEHESIVE® systems.
- high release levels
- good release stability
Specific features of CRA® 21
- Controlled Release Agent
All the information provided is in accordance with the present state of our knowledge. Nonetheless, we disclaim any warranty or liability whatsoever and reserve the right, at any time, to effect technical alterations. The information provided, as well as the product's fitness for an intended application, should be checked by the buyer in preliminary trials. Contractual terms and conditions always take precedence. This disclaimer of warranty and liability also applies particularly in foreign countries with respect to third parties' rights.
Comprehensive instructions are given in the corresponding Material Safety Data Sheets. They are available on request from WACKER subsidiaries or may be downloaded via WACKER web site http://www.wacker.com.
CRA® 21 can be processed together with nearly all solvent-based DEHESIVE® products. It is miscible with them in all proportions.
Mixtures of CRA® 21 and DEHESIVE® are ideal for the production of release paper and PSA-laminates. Suitable substrates include PE-laminated paper, polyester films (PET) and papers.
Because of the high efficiency and stable release characteristics of CRA® 21, the product is ideal for the production of double-sided release liners.
Batches of coating compound must be prepared in the
order given below.
1. First pour in solvent-based DEHESIVE® polymer
2. Add solvent and stir slowly until the mixture is
3. Add CRA® 21 release modifier and stir
slowly until the mixture is homogeneous
4. Thoroughly stir in Crosslinker to this mixture
5. Slowly stir in catalyst.
Local over-concentrations must be avoided.
To obtain exceptionally high release forces, CRA® 21 can also be processed without DEHESIVE®. In this case, the amounts of catalyst and crosslinker required for efficient curing may vary from DEHESIVE® containing formulations. However, we recommend the adjustment of specific formulations to optimize final coating properties for the intended use.
The 'Best use before end' date of each batch is shown on the product label.
Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons.
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