Yes, sandalwood is among the 3 most-preferred wood for wrangka/sheath. (others are timoho and trembalo). What I really meant with 'chip' was 'crack'.
To get the fragrance of sandalwood on Timoho/Trembalo wrangkas you can use sandalwood as the gandar part. It gives the same effect as if you use the sandalwood as wrangka. Of course, the trick won't work on gandar iras
In Jogjakarta, this 'trick' usually applied to the pusakas, mostly which once belongs to royal families. So it is worth to take a look at the gandar, if you find a 'suspected' keris. At least it shows what the keris was really meant to the previous owner. If the keris and wrangka is an original match, of course