Layer 3 vlan isolation

Hello,

     I was looking for commands on how to prevent certain L3 vlans from talking to each other on Juniper devices, specifically EX4200. I know with Cisco you use ACL and then apply it to the vlan interface but I have not found any commands to deny certains L3 vlans from communicating with each other. I have about 15 RVIs on the switch and I need to have 5 of them not communicate with the others. Can anyone help?

Thanks,

TD