BIS Certification Consultancy for Domestic Stainless Steel Vacuum Flasks/Bottles | IS 17526:2021
Introduction: BIS Certification for Stainless Steel Vacuum Flasks and Bottles
Domestic stainless steel vacuum flasks and bottles are widely used to store hot and cold beverages while maintaining their temperature for extended periods. These products are available in different capacities, designs and configurations, including wide-mouth and narrow-mouth bottles.
To ensure product quality, performance and consumer safety, the Bureau of Indian Standards (BIS) has established
IS 17526:2021 – Domestic Stainless Steel Vacuum Flask/Bottle.
The product falls under the
Insulated Flask, Bottles and Containers for Domestic Use (Quality Control) Order. BIS lists IS 17526:2021 under its compulsory certification framework, and BIS has reiterated that the covered product categories require certification under the applicable Quality Control Orders, subject to specified exemptions. <Cite refs={["turn564810search0","turn564810search2"]}/>
Manufacturers intending to manufacture or market domestic stainless steel vacuum flasks and bottles in India should assess their certification requirements, manufacturing facilities, testing arrangements and product documentation before applying for a BIS licence.
Qualitance India provides BIS certification consultancy to help manufacturers prepare documentation, assess product compliance, coordinate testing and navigate the ISI Mark licensing process.
1. What Is IS 17526:2021?
IS 17526:2021 is the Indian Standard for
Domestic Stainless Steel Vacuum Flask/Bottle. It specifies requirements for the product's construction, materials, performance, testing, marking and packaging.
The BIS Product Manual for this standard is used as a reference by BIS offices and licensees for certification under Scheme-I of the BIS (Conformity Assessment) Regulations, 2018. It is also intended to assist prospective applicants. <Cite refs={["turn564810search23"]}/>
Key product categories and scope considerations include:
- Domestic stainless steel vacuum flasks and bottles.
- Wide-mouth flask or bottle designs.
- Narrow-mouth flask or bottle designs.
- Different nominal capacities within the approved licence scope.
Manufacturers should identify their product configurations and proposed capacity range before submitting an application.
2. Is BIS Certification Mandatory for Stainless Steel Vacuum Bottles?
Yes. Domestic stainless steel vacuum flasks and bottles covered by IS 17526:2021 are included in the BIS compulsory-certification framework under the applicable Quality Control Order.
The BIS Scheme-I listing identifies IS 17526:2021 under the
Insulated Flask, Bottles and Containers for Domestic Use category. <Cite refs={["turn564810search0","turn564810search1"]}/>
Before manufacturing, importing, storing or selling a covered product, businesses should verify the latest applicable Quality Control Order, amendments and exemptions.
Manufacturers should pay attention to the following:
- Whether the product is intended for domestic use and falls within the standard's scope.
- Whether the product is a stainless steel vacuum flask or bottle covered by IS 17526:2021.
- Whether the proposed capacity and design can be included in the licence scope.
- Whether any specific exemption applies to the relevant transaction.
- Whether the applicable standard amendments and product manual have been implemented.
A product's marketing description alone does not establish whether it is covered. The technical characteristics and applicable regulatory provisions must be reviewed.
3. Applicable Indian Standard and Certification Scheme
| Particular |
Details |
| Product |
Domestic Stainless Steel Vacuum Flask/Bottle |
| Indian Standard |
IS 17526:2021 |
| Certification scheme |
BIS Scheme-I (ISI Mark Scheme) |
| Certification authority |
Bureau of Indian Standards |
| Applicable QCO |
Insulated Flask, Bottles and Containers for Domestic Use (Quality Control) Order and amendments |
| Product Manual |
PM/17526/3/December 2024 |
| Licence scope |
Product type and nominal capacity range, as approved by BIS |
The December 2024 BIS Product Manual identifies the product under IS 17526:2021 and sets out sampling, grouping, testing equipment and inspection-and-testing requirements. <Cite refs={["turn564810search23"]}/>
Important: IS 17526:2021 has received amendments. The BIS product manual available for December 2024 records two amendments, and BIS has issued implementation instructions for Amendment No. 2. Manufacturers should check the latest amendments and implementation dates applicable at the time of filing their application. <Cite refs={["turn716623search21","turn716623search24"]}/>
4. Product Types and Licence Scope
The BIS Product Manual identifies two types of flasks:
The licence scope also records the nominal capacity range in millilitres, from a specified minimum capacity up to and including a specified maximum capacity. <Cite refs={["turn564810search23"]}/>
Manufacturers should prepare a product matrix before applying.
| Scope parameter |
Information to identify |
| Product name |
Domestic stainless steel vacuum flask/bottle |
| Type |
Wide-mouth or narrow-mouth |
| Nominal capacity |
Each capacity intended to be covered |
| Inner container |
Material and relevant specification |
| Outer protective case |
Material, thickness and finish, as applicable |
| Accessories |
Stopper, washer, O-ring, handle, strap and other fitted parts, as applicable |
| Manufacturing process |
Manufacturing and assembly arrangements |
The applicable grouping guidelines in the current product manual should be followed when deciding which models and capacities can be represented by samples. Manufacturers should not assume that every design or capacity is automatically covered by a single test report.
5. Technical and Quality Requirements Under IS 17526:2021
The standard addresses the product's materials, workmanship, performance and safety-related characteristics.
The BIS Laboratory Information Management System lists a range of test parameters for IS 17526:2021, including material composition, coating characteristics, thermal retention, leakage and mechanical performance. <Cite refs={["turn564810search4"]}/>
A. Materials of construction
The inner container must comply with the applicable material requirements. The standard also addresses the outer protective case, accessories and stopper-related materials.
B. Chemical composition of the inner container
The material used for the inner container is an important part of the compliance assessment. During surveillance, the product manual requires an additional sample for independent testing of the chemical composition of the inner-container raw material. <Cite refs={["turn564810search23"]}/>
C. Coating and heavy-metal requirements
The testing framework includes requirements related to coating thickness and specified substances such as lead and cadmium, as applicable under the standard.
D. Auxiliary closure and BPA
The BIS laboratory listing includes a requirement relating to Bisphenol A (BPA) in auxiliary closures. The applicable material and test requirements must be checked against the current standard and amendments. <Cite refs={["turn564810search4"]}/>
E. Heat-retention capability
Heat-retention testing evaluates the ability of the flask or bottle to maintain the temperature of hot contents under the prescribed test conditions.
F. Cold-retention capability
Cold-retention testing evaluates performance when the flask or bottle is used to maintain the temperature of cold contents.
G. Impact resistance
The testing framework includes drop-impact and pendulum-impact tests, as applicable, to assess resistance to specified mechanical impacts.
H. Leakage and joint leakage
Leakage tests assess whether liquid escapes from the product or its joints under the specified test conditions.
I. Handle, shoulder strap and cord strength
Where these components are provided, the applicable tests evaluate their strength and suitability.
J. Stability and pour performance
The standard includes tests relating to product stability and pouring performance.
The exact test methods, conditioning requirements and acceptance limits must be verified in the latest applicable edition of IS 17526:2021 and its amendments.
6. Sample Requirements for BIS Certification
The BIS Product Manual PM/17526/3/December 2024 specifies a sample size of
eight flasks. <Cite refs={["turn564810search23"]}/>
| Particular |
Requirement |
| Product |
Domestic stainless steel vacuum flask/bottle |
| Sample quantity |
8 flasks |
| Product type |
Wide-mouth or narrow-mouth, as applicable |
| Capacity range |
To be assessed against the grouping guidelines |
| Raw-material testing |
Relevant requirements under Clause 7.1 |
| Surveillance sampling |
Includes an additional sample for independent testing of inner-container raw-material chemical composition |
The number of samples needed for a particular application should be confirmed against the current product manual and BIS sampling instructions.
Before preparing or dispatching samples, manufacturers should confirm the proposed grouping, representative capacities, product configurations and laboratory or factory-testing arrangements.
7. Documents Required for BIS Certification of Vacuum Flasks
A complete application requires company information, product details, manufacturing records and evidence of suitable quality-control arrangements.
The final checklist should be prepared against the current BIS application requirements and the product manual.
A. Company and manufacturing documents
- Company registration or constitution documents.
- Manufacturer's name and address.
- Manufacturing facility address.
- Authorised signatory details.
- Applicable identity and address documents.
- Factory layout and relevant manufacturing-area details.
- Details of manufacturing capacity.
B. Product and technical documents
- Product description and proposed licence scope.
- List of wide-mouth and narrow-mouth models.
- Nominal capacity details.
- Product specifications and drawings, where relevant.
- Inner-container material specifications.
- Outer protective case and accessory material details.
- Details of stoppers, washers and O-rings, where applicable.
- Manufacturing and assembly process flow chart.
- Packaging and product marking details.
C. Machinery and testing facilities
- List of production machinery.
- Details of welding and assembly equipment.
- List of testing equipment.
- Equipment specifications and identification details.
- Calibration records for applicable instruments.
- Details of in-house testing facilities and personnel.
- Testing arrangements for any tests requiring external facilities, as permitted.
D. Quality-control documents
- Raw-material inspection procedures.
- In-process quality-control procedures.
- Finished-product inspection and testing formats.
- Batch identification and traceability records.
- Non-conforming product control procedures.
- Calibration and equipment maintenance records.
- Relevant quality-control instructions and work procedures.
E. Packaging and marking information
- Product label and marking details.
- Packaging specifications.
- Manufacturer identification.
- Model and capacity identification.
- Details necessary to implement BIS marking requirements once licensed.
This is a preparation checklist, not an exhaustive list of mandatory documents for every manufacturer. BIS may require additional information based on the application, manufacturing arrangement and applicable certification requirements.
8. BIS Certification Process for Stainless Steel Vacuum Flasks
The certification process generally includes the following stages.
Step 1: Product and applicability assessment
The product is assessed against IS 17526:2021 and the applicable Quality Control Order.
Step 2: Product scope finalisation
The manufacturer identifies the intended flask types, capacities and product configurations. The current grouping guidelines are reviewed before selecting samples.
Step 3: Manufacturing facility assessment
The manufacturing process, inner-container material, welding and assembly operations, testing facilities and quality-control procedures are reviewed for compliance gaps.
Step 4: Documentation preparation
Company documents, technical specifications, process details and quality-control records are compiled and checked for consistency.
Step 5: BIS application submission
The application is prepared and submitted through the applicable BIS procedure with the prescribed information and fees.
Step 6: Factory assessment and testing
The BIS Product Manual provides for factory-based testing arrangements and inspection-and-testing requirements. The exact process should be confirmed against the current manual and instructions applicable to the application. <Cite refs={["turn564810search23"]}/>
Step 7: Closure of observations
Any documentation gaps, inspection observations or test failures must be addressed with suitable corrective action and supporting evidence.
Step 8: Grant of BIS licence
BIS may grant the licence after it is satisfied that all applicable requirements have been met. The manufacturer must comply with the approved scope, marking conditions, surveillance requirements and other licence obligations.
Note: The time required depends on documentation readiness, factory assessment, testing and closure of observations. Application submission does not guarantee approval or a fixed licence-grant date.
9. Manufacturing and Quality-Control Requirements
Manufacturers should establish controls that ensure consistent conformity throughout production.
Inner-container material control: Maintain material specifications and traceability records for the stainless steel used.
Welding and workmanship: Ensure welding and assembly comply with the applicable standard, including requirements introduced through amendments.
Component control: Establish appropriate controls for stoppers, washers, O-rings, handles and straps, where fitted.
Thermal performance: Conduct heat- and cold-retention testing as required by the applicable standard.
Leakage testing: Verify leakage and joint leakage under the prescribed conditions.
Impact and mechanical testing: Maintain arrangements for the applicable impact, handle-strength, strap-strength and cord-strength tests.
Calibration: Implement a calibration plan for relevant measuring and testing equipment.
Batch traceability: Link production batches to inspection records and relevant test results.
Surveillance readiness: Maintain records and be prepared for the additional sampling requirements specified in the product manual.
These controls support consistent product quality and help the manufacturer maintain conformity with the approved BIS licence scope.
10. BIS Certification Fees for Stainless Steel Vacuum Flasks
The total project cost depends on the applicable BIS fee schedule, testing requirements, proposed licence scope and the readiness of the manufacturing facility.
| Cost component |
Description |
| BIS application fees |
Applicable fees under the current BIS schedule |
| Product testing |
Charges for testing under the applicable requirements |
| Inspection-related expenses |
Expenses associated with assessment and inspection arrangements |
| Consultancy charges |
Professional support for documentation and certification preparation |
| Testing equipment |
Costs for required equipment, where applicable |
| Calibration |
Calibration and maintenance of relevant instruments |
| Corrective actions |
Costs associated with addressing identified compliance gaps |
| Licence-related fees |
Applicable marking, licence and renewal-related charges |
The BIS laboratory information system provides testing-related information for IS 17526:2021, including laboratory-specific charges and test details. These should be verified directly before budgeting, as charges and availability may vary. <Cite refs={["turn716623search3"]}/>
For an accurate estimate, manufacturers should identify the product types, proposed capacity range, testing arrangements and existing manufacturing capabilities.
11. Common Challenges in BIS Certification
Incorrect product grouping
Manufacturers may assume that one sample automatically covers all capacities and models. The applicable grouping guidelines should be followed.
Incomplete material documentation
The manufacturer may lack sufficient records for the inner-container material or other components.
Welding and workmanship issues
Manufacturing arrangements may require improvement to satisfy the applicable welding and workmanship requirements.
Inadequate testing arrangements
The facility may not have suitable equipment or documented procedures for the required performance tests.
Missing amendment updates
Applications and quality-control procedures should reflect the amendments applicable to IS 17526:2021.
Incomplete surveillance records
Manufacturers may not be prepared for continued testing, record retention and additional sampling requirements.
A structured pre-assessment helps identify these issues early and organise corrective action before the formal certification process.
12. Why Choose Qualitance India for BIS Certification Consultancy?
Qualitance India provides consultancy support for BIS product certification, manufacturing compliance and quality-management requirements.
Our support can include:
- Initial assessment of IS 17526:2021 applicability.
- Review of product types and proposed capacity range.
- Assistance with the BIS documentation checklist.
- Review of material specifications and manufacturing arrangements.
- Testing coordination and sample-planning guidance.
- Factory assessment preparation.
- Support in addressing observations and documentation gaps.
- Guidance on licence scope, BIS marking and continuing compliance obligations.
Our consultancy approach is tailored to the manufacturer's product range, facility readiness and project requirements. BIS fees, laboratory charges and other third-party expenses should be identified separately in the commercial proposal.
13. Frequently Asked Questions (FAQs)
Q1. Which Indian Standard applies to domestic stainless steel vacuum flasks?
The applicable standard is
IS 17526:2021 – Domestic Stainless Steel Vacuum Flask/Bottle. The current amendments and product manual should be reviewed before applying. <Cite refs={["turn564810search23"]}/>
Q2. Is BIS certification mandatory for stainless steel vacuum bottles?
Yes. IS 17526:2021 is included in the BIS compulsory-certification framework under the applicable Quality Control Order, subject to the relevant exemptions and provisions. <Cite refs={["turn564810search0","turn564810search2"]}/>
Q3. What is the sample quantity for BIS certification?
The December 2024 BIS Product Manual specifies eight flasks. Confirm the current sampling and grouping requirements before arranging samples. <Cite refs={["turn564810search23"]}/>
Q4. Which types of flasks are identified in the licence scope?
The product manual identifies wide-mouth and narrow-mouth flasks, with the nominal capacity range specified in the licence scope. <Cite refs={["turn564810search23"]}/>
Q5. What tests are relevant to IS 17526:2021?
The testing framework includes material and coating requirements, capacity, heat and cold retention, impact resistance, handle and strap strength, leakage, staining, stability and pouring performance, as applicable. <Cite refs={["turn564810search4"]}/>
Q6. Does the standard include requirements for BPA, lead and cadmium?
The BIS laboratory listing includes testing parameters for BPA in auxiliary closures and lead and cadmium in relevant coating or material requirements. The applicable clauses and limits should be confirmed against the current standard and amendments. <Cite refs={["turn564810search4"]}/>
Q7. Can multiple capacities be covered under one BIS licence?
The product manual provides grouping guidelines and a licence scope based on a nominal capacity range. The proposed capacities and representative samples must be assessed under those guidelines. <Cite refs={["turn564810search23"]}/>
Q8. How long does BIS certification take?
The timeline depends on documentation readiness, factory assessment, testing arrangements and closure of observations. A reliable estimate should be prepared after reviewing the facility and proposed product scope.
Q9. What is the cost of BIS certification for vacuum flasks?
The cost depends on applicable BIS fees, testing charges, consultancy, product grouping and facility readiness. A project-specific quotation is recommended.
Q10. Where can manufacturers verify official requirements?
Manufacturers should consult the BIS Scheme-I compulsory-certification listing, the latest product manual, the current IS 17526 amendments and the applicable Quality Control Order.
Official References
- BIS Product Manual – IS 17526:2021, December 2024: https://www.bis.gov.in/wp-content/uploads/2024/12/PM-IS-17526-1.pdf
- BIS – Scheme-I Compulsory Certification Listing: https://www.bis.gov.in/products-under-compulsory-certification/scheme-1/?lang=en
- BIS – Product Manuals: https://www.bis.gov.in/product-certification/product-specific-information-2/product-manualsmk/?lang=en
- BIS – Laboratory Information Management System for IS 17526: https://lims.bis.gov.in/home/search_is_number/?is_number__doc_no=17526
- BIS – Implementation Guidelines for Amendment No. 2: https://www.services.bis.gov.in/tmp/Circular_AVWS_2024-12-09.pdf
- Press Information Bureau – BIS guidance on mandatory certification for domestic insulated flasks and containers: https://www.pib.gov.in/PressReleasePage.aspx?PRID=2301538&lang=2®=48
Contact Qualitance India for BIS Certification Consultancy
Are you a manufacturer of domestic stainless steel vacuum flasks or bottles looking to obtain BIS certification under IS 17526:2021?
Qualitance India provides professional consultancy support for BIS application preparation, technical documentation, testing coordination, factory assessment preparation and regulatory compliance.
Contact us to discuss your manufacturing facility, product types, capacity range and BIS certification requirements.
Qualitance India – Improving Quality & Competence
