The Glass Inner Thermos Vacuum Flask features a glass inner liner, vacuum insulation and a plastic or stainless steel outer body. Available in 1L to 3.2L capacities, it supports hot and cold beverage applications for houseware, HORECA and private-label programs. Custom colors, branding and packaging are available for OEM projects.

Product Specifications

Specification	Details
Product Type	Glass Inner Thermos Vacuum Flask
Liner Material	Glass
Outer Body	Plastic / Stainless Steel
Vacuum Insulation	Yes
Capacity	1L / 1.8L / 2L / 3.2L
Thermal Insulation	Model and test condition dependent
Handle	Integrated
Style	Classic
Color	Various
Beverage Application	Coffee, Tea, Water
Food Contact Safety	SGS Test Report
Brand	JIAKAI or Customized
MOQ	Standard product：50 cartons Custom logo：From 5,000 pcs Custom packaging：From 5,000 pcs Custom color：To be confirmed by project
Delivery	20–35 Days After Deposit
Dispatch	Qingdao / Ningbo

Thermal Performance

Thermal retention is evaluated under defined test conditions, with results varying by capacity, filling volume, initial temperature, ambient conditions and closure configuration.

As a reference, selected configurations can achieve up to 24 hours of hot retention and up to 36 hours of cold retention under specified test conditions.

For OEM projects, thermal performance can be verified against an agreed test method during sample approval or pre-production inspection.

Construction & Components

The Glass Inner Thermos Vacuum Flask features a glass inner liner enclosed within a vacuum-insulated outer body. Depending on the model, the outer body is available in plastic or stainless steel.

Main Components：
Glass Inner Liner – Beverage-contact inner container.
Vacuum Insulation Layer – Helps reduce heat transfer.
Outer Body – Plastic or stainless steel, depending on the model.
Sealing Ring – Supports closure sealing.
Press-Top Closure – Provides opening and pouring.
Integrated Handle – Supports carrying and serving.

Sealing & Handling

The press-top closure uses a sealing ring to help maintain a secure seal during normal use. The integrated handle supports carrying and pouring, particularly for larger-capacity models.

Closure and sealing configurations can be confirmed during OEM sample approval.

OEM & Private Label Customization

Logo & Branding
Available decoration options may include:
Silk-screen printing
Heat-transfer printing
Laser engraving
Other methods depending on the outer-body material

Custom Colors
Custom outer-body colors are available for selected OEM projects. Pantone matching can be discussed based on the required color specification.

Retail Packaging
Private-label packaging can include:
Custom color boxes
Customer artwork
Product labels
Carton markings
Export carton specifications

Applications

Household & Retail
Suitable for families and individual consumers who need reusable storage for hot water, tea, coffee and other beverages.

Office & Commercial Beverage Service
The larger capacities can be used for office beverage service, meeting areas and shared hot-water or tea applications.

HORECA
The flask can be used in hotels, restaurants, cafés and other hospitality environments for tabletop beverage service, room service and other hot or cold beverage applications.

Corporate Gifts & Promotional Products
Customized colors, branding and packaging allow the product to be developed for corporate gifting and promotional programs.

FAQ

Q: Do you provide FDA or LFGB test documentation?

A: SGS test reports can be provided for applicable food-contact material and product configurations. For projects requiring FDA or LFGB compliance, the exact regulatory requirements and testing scope should be confirmed according to the destination market and final product materials.

Q: How do you inspect glass liners before production?

A: Incoming glass liners can be checked for dimensional accuracy, surface defects and other requirements defined in the product specification before they are released for production.

Q: How do you test vacuum performance?

A: Vacuum integrity is checked during production according to the applicable manufacturing inspection procedure. Additional thermal-performance testing can be conducted on production batches according to the agreed test requirements.

Q: How is the glass liner protected during transportation?

A: The glass liner is enclosed within the outer body, while the export packaging uses individual product protection, retail boxes, internal partitions where required and reinforced master cartons to reduce movement and impact during transportation.

Q: Can you provide replacement glass liners?

A: Replacement glass liner availability depends on the selected model and configuration. For projects requiring replacement components or long-term aftermarket support, this requirement can be confirmed before order placement.

Q: What is your standard payment term?

A: The standard payment term is 30% deposit and 70% against B/L copy. For qualifying volume orders and long-term business relationships, other payment arrangements such as L/C at sight may be discussed subject to approval.

Q: What is the lead time for OEM orders?

A: Typical production lead time is 20–35 days after deposit, but the actual schedule depends on order quantity, product configuration, customization, packaging and production capacity.

Q: How do you protect our OEM designs and tooling?

A: Customer-provided artwork, product specifications, custom tooling and other proprietary information are handled according to the agreed confidentiality and intellectual-property requirements. NDA arrangements can be discussed for projects requiring additional protection.

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