Mineral-filled sheathed heating elements are electrical heating components used in appliances
and industrial equipment to generate heat safely and efficiently. These elements are designed
with a metal sheath and filled up with insulating material like magnesium oxide, which helps in
the proper transfer of heat, electrical insulation, and long-lasting performance.
They are
commonly used in water heaters, industrial heaters, ovens, and similar heating applications.
Since these heating elements work at high temperatures and involve electricity, their safety and
quality are very important; thus, BIS certification under IS 4159:2021 is required.
This certification confirms that the product is safe to use, properly tested, and reliable for
long-term operations.
what is is 4159:2021 ?
This is the Indian standard for mineral-filled sheathed heating elements. It is set by the Bureau
of Indian Standards (BIS) to ensure that these heating elements used in electrical and heating
appliances are safe, reliable, and of good quality.
This standard ensures that mineral-filled sheathed heating elements must be:
- Safe to use at high temperatures without electrical risk
- Efficient in heat transfer and performance
- Properly insulated to prevent electric shock
- Strong and durable for long-term use
- Well-protected against moisture, corrosion, and wear
- Consistent in design, size, and manufacturing quality
testing and inspection requirements
To ensure proper and efficient performance of mineral-filled sheathed heating elements, BIS
defines proper testing and inspection requirements during manufacturing.
what are r & s ?
R (Required): Test must be done in the manufacturer’s own laboratory
S (Subcontracting Allowed): Test can be done in a BIS-approved external laboratory
physical and quality tests
- Freedom from Defects (R) – Ensures the heating element has no cracks, damage, or surface defects
- Dimensions and Size (R) – Checks correct diameter, length, and uniform shape
- Surface Condition (R) – Ensures proper finish and protection of sheath material
electrical and performance test
- Insulation Resistance (R) – Ensures safe electrical insulation between core and sheath
- Heating Performance Test (R) – Checks proper heat generation and efficiency
- Dielectric Strength (R)—Ensures safety under high voltage conditions
mechanical and material tests
- Sheath Strength (R)—Ensures outer metal sheath is strong and durable
- Bending Test (R) – Checks flexibility without damage
- Material Quality Check (R) – Ensures proper use of sheath and filling material
inspection and process control
- In-process Quality Checks (R) – Regular checks during manufacturing
- Batch Testing (R) – Testing of each production batch
- Test Records Maintenance (R) – Proper documentation of all results for traceability
bis certification process for mineral-filled sheathed heating elements
The BIS certification process ensures that the product meets the required standard for proper
and efficient operation as defined by the Bureau of Indian Standards (BIS). The process
includes the following steps:
- Online Registration : Manufacturers register on the BIS Manak Online Portal by submitting company details, factory information, and product specifications. Foreign manufacturers must appoint an Authorized Indian Representative (AIR) in India.
- Testing at BIS-Approved Laboratory : Product samples are tested in BIS-approved laboratories to evaluate electrical safety, insulation resistance, heating efficiency, durability, and overall performance as per requirements.
- Application Submission : The application is submitted along with laboratory test reports, technical documents, manufacturing process details, and factory information. Foreign manufacturers must also provide AIR-related documents.
- Factory Inspection : BIS officials conduct an on-site inspection of the manufacturing unit to verify production processes, quality control systems, safety measures, and compliance with the standard.
- Grant of BIS License : If all requirements are successfully met, BIS issues the certification license under Scheme-I, allowing the manufacturer to produce and sell certified products.
- Use of ISI Mark : After certification approval, the manufacturer is permitted to use the ISI mark along with a CM/L number on mineral-filled sheathed heating elements, confirming compliance with the standard.
documents required for is 4159 certification
The following documents are typically required for obtaining BIS certification:
| Basic Details | - GST certificate
- Email ID & Contact Number
- Factory & Office Address
- Rent Agreement / Lease Deed (if applicable)
|
| Legal Documents | - Partnership Deed (if partnership firm)
|
| Manufacturing Details | - List of machinery
- Process flow chart
- Factory layout
|
| Raw Material Details | - Supplier details
- List of Raw Materials
- Raw Material Invoices
- Raw Material Test Certificates
|
| Testing & Quality Control | - List of Testing Equipment
- Calibration certificates
- QC / Lab In-charge Appointment Letter & Qualification
|
| Production Details | - Annual Installed Capacity
- Last Year's Production Value
|
| Product Details | - Quantity per Package
- Nature of Packing
- Nature of Printing / Marking on Product
|
| Management Details | - Top Management Details
- Concerned Person for BIS Communication
|
| Brand & Certification Documents | - Trademark / Brand Certificate
- Consent Letter from BIS Recognized Laboratory
|
| Additional Documents | - Weekly off details
- Hygiene Document (if applicable)
- Relaxation Letter (if applicable)
- Any Other Relevant Document
|
marking requirements and license validity
marking requirements
When a manufacturer obtains the BIS license, the ISI mark for mineral-filled heating elements
must be applied clearly and permanently on the product or its packaging. In addition to the ISI
Mark, other important details must also be provided on the product or packaging, as specified in
the table below. This ensures the product meets all quality and safety standards.
Note:
Marking is typically applied using durable stamping, tagging, or permanent printing to ensure
clear identification during handling, storage, and transportation, as per BIS marking
requirements.
validity of bis license for mineral-filled heating element
After obtaining BIS certification for the product, the license is valid for a fixed period and must
be maintained by following BIS rules and standards.
cost of bis certification for sheathed heating element
The cost of BIS certification includes charges for application, inspection, license, testing, and
marking. These fees are paid to BIS as per Scheme I guidelines. Cost Breakdown
indian manufacturers
foreign manufacturers
Note: Additional costs such as pre-testing or factory pre-inspection may apply. The total cost
may vary depending on product type, testing requirements, and current BIS guidelines.
conclusion
BIS certification for mineral-filled sheathed heating elements as per IS 4159:2021 ensures that
the product has to meet essential safety needs, quality parameters, and performance standards
required for reliable use in different engineering applications. It also confirms that each unit is
properly tested for electrical safety, insulation resistance, heating efficiency, and durability,
making it safe for long-term industrial applications.
With the support of an experienced BIS consultant like EVTL India, manufacturers can complete
the certification process smoothly, reduce compliance errors, and achieve faster approval for
their products in the Indian market.
