Riftcore

[CosmicTruth]

My first eGo-T I put a Kanger tank on that was made of plastic, So I was restricted as to what e-liquids I could use. Still many of the flavor vendors add warnings on their flavors that they eat plastic, and I wonder if there is some connection in this case?

[Ippolit]

As we have been saying Cosmic, the Limonene ( a terpene) contained in many liquids is clearly to blame. I've looked at all my devices and checked those with silicon components, but as I don't often use flavours with strong citrus notes I don't think it's a problem for me.

There is a lot of data regarding silicon, rubber and some synthetic materials swelling and degrading due to terpenes in the world of commercial pumps and gaskets, but nothing online that I could find about vape devices. Basil provides the evidence above, the silicon has swollen to twice it's normal size in his image.

Interesting that you have seen flavours with warnings on them regarding this, do you have any to provide an image? Never seen any in the UK.

[CosmicTruth]

I don't think it is just Limonene Terpene. I am wondering if the same "plastic cracker" flavor components harm silicone? Or is it a separate issue?

Here is a list of e-juices known to deteriorate polycarbonate tanks:

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)
lien Vision's Pineapple Pulp
Cinnamon like "fire" "atomic cinnamon" types, not warm cinnamon like cinnamon coffee cake, this is okay
Citrus acid
Clove oil
Cola(because of cinnamon)?
Dekang Pina Colada/Tobacco mixed
DIY Flavorshack Tangerine
DIY Gummibear(melted plastic endcaps on DCTank).
E liquids that contain triacetin, used in vg liquids to carry flavor more effectively
Ecblends Apple Pie
Ecblends Banana
Ecblends Cinnamon Apple
ECBlends Gingerbread, double flavor
ECBlends Grape
ECBlends Rootbeer
Ectoplasm
Elixirliquids Cinnamon Death
Elixirliquids Deathday Cake
Elixirliquids Gummibear
Elixirliquids Heaven and Hell(cinnamon with menhtol)
Elixirliquids Rage(hot cinnamon)
FA Tiramisu
HellaVapor's Raspberry Winta-green.
Honeysuckle
***** ***** Vanilla Cola
KBV Hummingbird Nectar
Lorann Butter Rum flavor
Lorann Butterscotch
Lorann Peppermint oil
MadVapes Black Licorice
Malic acid
Mimosa(because of the orange)
Mrs. T's Snickerdoodle
Mrs. T's Strawberry Lemonade
Mrs. T's Strawberry Shortcake
Mt. Dew flavoring
Mt. Vapor's Lemonade(endcaps melted)
Neon Vapors neon Cherry
Nutmeg
Oil based/e liquid that conains essential oils, when mixed with.pg/vg, creates esters which will crack plastics
Rawrvapor Hawaii Sunrise
Rawrvapor Strapple
Sassafras
Sour flavors
Tasty Vapor Cherry Cola
Tasty Vapor Sherbet
Timmy's Double Double from Juicy Clear
TPA Blueberry Candy(melted plastic endcaps on DCTank)
TPA Blueberry(melted plastic endcaps on DCTank)
TPA Cherry Blossom flavoring
TPA Cinnamon Danish flavoring
TPA Earl Gray Tea flavoring
TPA honeysuckle flavoring
TPA maraschino cherry flavoring
TPA Pineapple flavoring
TPA ripe banana flavoring
TPA root beer flavoring
TPA Rootbeer Flavoring
TPA RY4 Double Flavoring
TPA Spearmint flavoring
TPA Vanilla Bean Ice Cream flavoring
TPA Vanilla Custard flavoring
V2Cig's Menthol
V4L WOW Peppermint Nobacco
VAL Goddess
Vapalicious Gooey Butter Cake.
Vape Dude's Lemonade
Vapor Renu Mt. Dew Baha Blast and Strawberry Limeade
Vapor Renu Teaberry, Cherry Vanilla (possibly most of their flavors)
Vaporbomb Fire 'n Ice(cracked tank, melted rubber drip tip)
Vaporbomb Green Apple
Vaporbomb Hot Cinnamon Candy
Vaporbomb Sun Kissed
Vaporbomb Sweet Cherry
Vaporbomb Sweet Cinnamon Red Hots
Vaporgod Licorice
Vapor Romm Cinnamon Red Hots
Virgin Vapor Luscious Lime
Virgin Vapor Sweet Summer Lemonade
Vixen Vapor Rootbeer
Wintergreen juice or flavoring
Ziquid Zenthol

This is not a comprehensive list, just what is reported at this time and may NOT be accurate.

source: http://www.discountvapers.com/liquids-and-tanks/

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The only reason I know is the vape shop I bought my first juices from warned me about some of their e-liquids, but it was a plastic issue not a silicone issue.