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Vacuum airpot Material Guide

Main Material List of  Water Bottle/Cup/Flask/Jug/Food Container/Beverage Vessel/airpot

Water bottle/drinking cup/tumbler/cup/vacuum flask/lunch box/dog bowl/airpot have a long list of materials available, ranging from stainless steel, titanium and other metals, plastics (PP, AS, Tritan) to wheat straw, sugarcane straw, recycled ocean plastics and more.

Main Material TypeAdvantagesDisadvantagesFDA CompliantBPA FreeApplications   for Drink Bottle / Flask / Tumbler / Cup / Mug / Jug / ContainerMaterial Cost
AluminumAlLow density; Light weight; Anti-corrosion; Fast heat conductionLow hardness and easy to deform; Toxicity of aluminum can cause metabolic   disorders in the human bodyNoYesKingStar has stopped making aluminum drinking bottles since 2005.Low
Stainless SteelSS201(Stainless Steel 18-1, Japan JIS: SUS201, USA AISI: 201)Easy to shape; Easy to be welded; DurableMetal ions will be precipitated when heated, which is harmful to health; Low   corrosion-resistant; Easy to crackNoYesOuter wall of double-walled container / vesselLow
SS304(Stainless Steel 18-8, Japan JIS: SUS304, USA   AISI: 304)Food  grade material; High tensile strength; Good weldability; Good formability;   Good corrosion resistant; DurablePoor sulfur resistance; Poor reduction resistance; Difficult to processYesYesBoth inner wall and outer wall of double-walled kitchen food grade   drinkware/container/vessel, bottle cap, handleMiddle
SS316(Stainless Steel 18-10, Japan JIS: SUS316, USA   AISI: 316)Medical grade material; Excellent heat resistance, acid resistance and alkali corrosion resistance; Good weldability; Good formability; Excellent corrosion resistant; Less Durable than SUS304Poor sulfur resistance; Poor reduction resistanceYesYesBoth inner wall and outer wall of double-walled food grade drinkware/container/vessel, bottle cap, handle; Container for medical  equipment; Medical grade containerHigh
TitaniumTi-6Al-4VEliHigh strength; Titanium alloys have excellent corrosion resistance in harsh   environments; Good bio-compatibility; Low density; Light weightPure titanium cannot be heat treatedYesYesMedical equipment / implants; Drinkware; Food container; Beverage vesselVery High
PlasticPolypropylene   (PP)High strength plastic resin, extremely high resistance to heat, moisture, and   chemicalsHigh strength plastic resin, extremely high resistance to heat, moisture, and   chemicalsYesYesLid; Cap; Cover; Plastic bottle/tumblerLow
Acrylonitrile-Styrene (AS)Solvent resistance; High StrengthInsufficient toughness; May gradually turn yellow after prolonged useYesYesLid;   Cap; CoverLow
Acrylonitrile Butadiene Styrene (ABS)Good mechanical and thermal properties; High hardness; Easy metal plating on the   surface; Fatigue resistance and stress cracking resistance; High impact   strength; Chemical corrosion resistance such as acid and alkali; Easy to   process and formPoor weather resistance; Not UV resistant; Easy to age under hot oxygen   conditions; Poor dissolution resistanceYesYesParts with hardness and wear resistance requirements such as buttons and gears of   the cup lid/lid/coverLow
Polyoxymethylene (POM)High tensile strength; Fatigue resistance; Creep resistance; Less water absorption; Good dielectric properties; Normal use at 120 °C; Small friction   coefficient; Excellent elasticityNo self-extinguishing; High molding shrinkageYesYesParts with hardness and wear resistance requirements such as buttons and gears of   the cup lid/lid/coverLow
AcrylicGood toughness; Not easy to breakNot wear-resistant, easy to scratch on its surface; Can not contact with organic   solvents, such as alcohol will make acrylic stickyYesYesPlastic bottle/tumbler/cupMiddle
ThermoplasticElastomer (TPE)Environmentally friendly; Wide range of hardness; Excellent colorability; Soft touch; Weather   resistance, fatigue resistance and temperature resistance; No vulcanization;   Can be covered and bonded with base materials such as PP, PE, PC, PS, ABS,   etc.Poor heat resistance; Physical properties decrease greatly as temperature rises;   Easy to deform under pressure; Poor resilience and durabilityYesYesSealing gasket; O ring; Overmolding for lid handle partMiddle
Polycarbonate (PC)High impact strength; Good creep resistance; Good heat resistance; Low embrittlement temperature (-130℃);   High transparency; Good dielectric properties; Good dimensional stabilityContains BPA; Poor solvent resistance; Easy to crack; Easy to hydrolyze when immersed   in boiling water for a long time; Poor fatigue strengthNoNoFunctional   part on bottle/tumbler/flask/cup/container and its cover & lidMiddle
TRITAN (PCTG)Good transparency; Strong impact strength; Hydrolysis resistance; High temperature  resistance; Easy processing; Good toughness; Chemical resistanceIt will be deformed at high temperature. Deformation and cracking may occur when   the temperature exceeds 94 degrees CelsiusYesYesBottle/flask/mug/cup/container/vessel   jug and its cap, cover & lidHigh
PPSUHigh hydrolytic stability; High transparency; high temperature resistance up to   207℃; Milk bottles/cups made of PPSU can be repeatedly boiled, microwaved, and steam sterilized; Chemical stability is good; Easy to cleanNoneYesYesbaby water bottle/tumbler/cup/flask/jug/containerVery High
Recycled Ocean PlasticConducive   to reducing marine environmental pollutionHigh MOQ; Processing technology is complex and difficultYesYesBottle and its cap, cover & lidVery High
SiliconeSolid   SiliconeHigh temperature resistance; Cold resistance; Solvent resistance; Anti-sticking;   Electrical insulation; Chemical resistance; Good elasticityVulcanizing   agent needs to be added during molding to shorten molding timeYesYesGasket; Anti-slip footer; Band; Strap; Collapsible Water BottleMiddle
Liquid SiliconeHigh and low temperature stability; Odorless; Transparent; Wide hardness range;   Chemical resistance; Weather resistance; Excellent sealing performance; Great elasticityHigh mold tooling costYesYesStraw; Nipple; Collapsible Water Bottle; Medical part/equipmentHigh

Auxiliary Material List

of Custom Vacuum Insulated Stainless Steel Drink Bottles/Hydro Jugs/Flasks/Cups/Tumblers

Auxiliary Material TypeApplication/FunctionFDA CompliantBPA Free
CopperPlating   copper on the outside of the inner wall of the thermos bottle cup to enhance the thermal insulation effectYesYes
Aluminum foilWrap   aluminum foil on the outside of the inner wall of the thermos bottle cup to enhance the thermal insulation effectYesYes
GetterZrVFeThe non-evaporable getter has the characteristics of large inhalation capacity and high inhalation rate. Remove the residual air between double walls of the vacuum flask.YesYes