Frequently asked questions
Please find below the introductory answers to frequently asked questions about Orverac® product line. Click on a subject heading below to view questions and answers relating to your selection. Should you have any further questions, please contact us.
Which Orevac® grades are recommended for blow moulding coextrusion?
Which Orevac® grades are used for barrier sheets ?
- For transparent sheet barriers (based EVA): Orevac®18211
- For PS sheets barriers with high performances: Orevac®18910
- Thermoformable multilayer sheets, based on:
What are the Orevac® grades that can be used as coupling agent?
Orevac® CA100 shows an appropriate range of properties such as high reactivity and low viscosity useful for chemical coupling agents in:
- Fiber Glass reinforced PP compounds
- Mineral filled PP compounds
- PP filled with natural fillers
- PP based alloys
Orevac® 18507 has been designed as a coupling agent for HDPE and mineral and/Or natural fillers. It is usually used at 2 to 5% loading.
What are the Orevac® grades recommended for PP based compounds?
Orevac® CA100 provide excellent adhesion between PP and polar fillers
(Glass, Metal, Minerals)
How to select the proper Evasin EVOH grade?
Evasin grade should be selected based on the required barrier properties and the processing method to be used.
Low ethylene content Evasin EVOH (29% and 32%) offer better barrier properties at normal humidity.
High ethylene content Evasin (38% and 44%) are better processability and resistance to water moisture but lower barrier properties.
How to calculate the thickness of Evasin EVOH needed in your application?
The OTR of Evasin EVOH and the moisture content of the application will be considered to determine the thickness of the Evasin EVOH layer required for your application. Please contact Arkema for assistance in making this calculation.
What are Evasin EVOH processing recommendations
Evasin EVOH product range enable our customer to use most processing technologies such as extrusion blown, extrusion cast, blow molding, etc. Recommended screws for Evasin EVOH have LD=24-30 and CR=3-3.5.
Screw temperatures should generally be 190-230°C. Melt temperature should not exceed 250°C.
What are the Orevac® grades recommended for HFFR compounds
An effective method to improve the fire resistance of polyolefins and lower their heat of combustion is to fill them with high loading of mineral fillers (>50%). The following Orevac grades are recommended for improving the mechanical properties of HFFR:
Typical Orevac® resin contents are 2 to 6 weight %.
Lotader® 3210, a terpolymer with high maleic anhydride content, has shows to improve significantly the water resistance of HFFR compounds when combined with Orevac® 18341.
What are the benefits of Orevac® 18362 ?
Orevac®18362 is newest Arkema tie layer for blown and cast barrier films. This new grade brings improved performance (bond strength), better clarity, more favorable regulatory status and better economics than existing Orevac®18360.
For more information, read the attached presentation "Orevac®18362".