Typical tank crackers include:
Bannana Flavours
Citrus Flavours
Cinnamon Flavours....
Oh hang on just pinched this list from UKVapers
List of e-juices known to crack polycarbonate tanks (originally compiled by ECF's My4Jewels and added to by UKV's members):
Any sour flavours
Any flavours that contain malic acid.
Any e-liquids that contain essential oils
E-liquids that contain triacetin, used in vg liquids to carry flavour more effectively
Cinnamon like "atomic cinnamon" types, not warm cinnamon like cinnamon coffee cake, this is OK
Wintergreen juice or flavouring
Mimosa
Cola
Nutmeg
Clove oil
Sassafras
TPA Ripe Banana flavouring
TPA Honeysuckle flavouring
TPA Maraschino cherry flavouring
TPA Cherry Blossom flavouring
TPA Root Beer flavouring
Mrs. T's strawberry shortcake, Snickerdoodle
KBV Hummingbird Nectar
Vapor Renu Teaberry, Cherry Vanilla (possibly most of their flavours)
Vapor Renu Mountain Dew, Baha Blast and Strawberry Limeade
Vapalicious Gooey Butter Cake
TPA Mountain Dew flavouring
TPA Cinnamon Danish flavouring
Rawrvapor Hawaii Sunrise
TPA Vanilla Custard flavouring
Tasty Vapor Cherry Cola
Vixen Vapor Rootbeer
TPA Pineapple flavouring
TPA Granny Smiths Apple
TPA Vanilla Bean Ice Cream flavouring
Vaporgod Licorice
Salmiak Salty Liquorice (probably most licorice flavours)
VAL Goddess
Some Vermillion River fruit e-liquids (the kentucky applewood, peachwood etc are OK, as are the cherry, hawaii pineapple or malibu pineapple)
Health Cabin Spearmint (essential oil?)
Health Cabin Chocolate Nut
Vaporzone Butterscotch flavouring
vapour juices spearmint leaf
Mount Baker Cherry Balsam Tobacco
Healthcabin butterscotch concentrate
dekang havana cigar bm2
From Atmos Lab's flavours only these below have reported problem with clearomizers:
Coffee
Cherry
Strawberry
Mastic
Ouzo
Kaimaki
Peach
Chestnut
Cola
Banana
Orange
Apple
Honey Moon