IS 4581 BIS Certification for Phosphorous Trichloride, Pure and Analytical Reagent
Phosphorous Trichloride, Pure and Analytical Reagent made, imported or sold in India must be certified against IS 4581 under an ISI mark licence (Scheme-I). What the standard covers, how testing works and how to get the licence.
About IS 4581
| Standard | IS 4581:1978 |
|---|---|
| Title | Phosphorous Trichloride, pure and Analytical Reagent |
| Product covered | Phosphorous Trichloride, Pure and Analytical Reagent |
| Category | Chemicals, Fertilizers, Polymers & Textiles |
| Scheme | ISI mark licence (Scheme-I) |
| Notified under | Phosphorous Trichloride (Quality Control) Order, 2020, S.O.1897(E) · Order PDF |
Editions and amendments of IS 4581
| Edition | Published | Status |
|---|---|---|
| IS 4581:2021 PHOSPHORUS TRICHLORIDE PURE AND ANALYTICAL REAGENT-SPECIFICATION Second Revision IS 4581 | 30 Nov 2021 | Current, next review 19 Feb 2031 |
| IS 4581:1978 Specification for phosphorus trichloride, pure and analytical reagent (First Revision) | Withdrawn 14 Mar 2022 |
No amendments to the current edition are listed by BIS.
Marking fee for IS 4581
BIS charges an annual minimum marking fee for the ISI mark under IS 4581, set by unit size, plus a per-unit rate once production passes the minimum:
| Unit size | Minimum marking fee (per year) |
|---|---|
| Large | ₹4,581 |
| Medium | ₹78,000 |
| Small | ₹63,000 |
| Micro | ₹39,000 |
ISI licences under IS 4581
BIS records 1 operative licences (1 including deferred, cancelled or under stop marking). Most licensed factories are in Gujarat (1).
Testing against IS 4581
BIS inspects the factory and has samples tested to the full Indian Standard at a BIS or BIS-recognised laboratory. After grant, the factory keeps testing production under the Scheme of Inspection and Testing, and BIS draws factory and market samples.
The test report has to cover every clause of IS 4581 that applies to the product, in the edition current on the date of testing. When BIS revises IS 4581 or replaces it with a new edition, existing licence holders move to the new edition by the date BIS sets in its notification.
How to get an ISI mark licence under IS 4581
The licence is granted to the manufacturer for a specific factory and product. Indian factories apply under Scheme-I; overseas factories apply under the Foreign Manufacturers Certification Scheme (FMCS) and must nominate an Authorised Indian Representative.
- Confirm the exact Indian Standard and the varieties to cover
- Get the product tested at a BIS-recognised lab (simplified procedure) or arrange BIS sampling
- Apply on Manak Online with factory, quality-control and test documents
- BIS factory inspection and sample verification
- Grant of licence, then marking with the ISI mark and CM/L number
Timeline. BIS targets 30 days under the simplified procedure (applying with a recent lab test report) and 90 days under the normal procedure. Overseas factories under FMCS typically take around 6 months.
Fees. Application fee ₹1,000 and annual licence fee ₹1,000, inspection charges of ₹7,000 per man-day, testing charges, and an annual minimum marking fee set for each Indian Standard (with concessions for micro and small units).
Mark. Certified products carry the ISI Standard Mark with the IS number and the CM/L-XXXXXXXXXX licence number.
Frequently asked questions
What does IS 4581 cover?
IS 4581:1978: Phosphorous Trichloride, pure and Analytical Reagent. BIS has made certification against it compulsory for phosphorous trichloride, pure and analytical reagent.
Is BIS certification under IS 4581 mandatory?
Yes, for phosphorous trichloride, pure and analytical reagent, under the Phosphorous Trichloride (Quality Control) Order, 2020, S.O.1897(E). The product needs a valid BIS licence (ISI mark) and must carry the ISI Standard Mark with the IS number and the CM/L-XXXXXXXXXX licence number.
Where is a product tested for IS 4581?
BIS inspects the factory and has samples tested to the full Indian Standard at a BIS or BIS-recognised laboratory. After grant, the factory keeps testing production under the Scheme of Inspection and Testing, and BIS draws factory and market samples.
How long does IS 4581 BIS certification take?
BIS targets 30 days under the simplified procedure (applying with a recent lab test report) and 90 days under the normal procedure. Overseas factories under FMCS typically take around 6 months.
Other standards in Chemicals, Fertilizers, Polymers & Textiles
- IS 170 Acetone
- IS 252 Caustic Soda
- IS 297 Sodium Sulphide, Technical
- IS 336 Ether
- IS 2012 Red Phosphorus
- IS 2080 Stabilized Hydrogen Peroxide
- IS 3205 Precipitated Barium Carbonate, Technical
- IS 4505 Sodium Formaldehyde Sulphoxylate
- IS 4566 Methylene Chloride (Dichloromethane)
- IS 5158 Phthalic Anhydride, Technical
Source: BIS lists of products under compulsory certification (Scheme-I, Scheme-II), checked October 2026. See the full BIS product list or all Indian Standards.
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