A Kodak Wratten 87 actualy starts transmitting at around 750nm, with about 50% transmition at about 800nm so can be used with Rollie IR film (but not Ilford SFX). Exposures will certainly be a bit on the slow side but just about usable. It will enable as good a IR effect you can get with film these days.

The good old Kodak wratten filter used for a fair bit of IR work was the Wratten 87c starting at 800nm and 50% at about 850nm. This is the one that wont work these days, (unless your going digital of course).

(I had made a post about diffrent filters but it appears to be waiting moderation for some reason).