The Bureau of Indian Standards (BIS) has issued important amendments to three Indian Standards across sectors including chemicals, renewable energy, and transport safety.
These amendments aim to improve product performance, safety, and regulatory compliance, with a transition window until 22nd March 2026.
🔧 Standards Amended
| Sl. No. | Standard No. & Title | Amendment No. | Sector | Date of Effect | Validity of Previous Version |
| 1 | IS 3504:2006 – Thymol — Specification | Amendment No. 1 | Chemicals | 23 Sep 2025 | Until 22 Mar 2026 |
| 2 | IS 16544:2016 – All Glass Evacuated Tubes Solar Water Heating System | Amendment No. 3 | Renewable Energy | 23 Sep 2025 | Until 22 Mar 2026 |
| 3 | IS 17236:2019 – Prevention and Safety Against Fire in Ropeways — Code of Practice | Amendment No. 1 | Ropeway Safety | 23 Sep 2025 | Until 22 Mar 2026 |
🧪 What’s Changing?
While the full text of amendments was not included in the notification, the changes are likely to involve:
- Updated chemical purity and testing parameters for Thymol, a widely used organic compound in pharmaceuticals and antiseptics.
- Improved thermal performance, durability, or installation standards for solar water heating systems using all-glass evacuated tubes.
- Enhanced fire safety protocols for passenger and material ropeways, critical for public safety in hilly and tourist regions.
🏭 Industry Impact
| Stakeholder | Impact |
| Chemical manufacturers | Must update specifications and QC for Thymol |
| Renewable energy sector | Solar product designs may require revision |
| Ropeway operators | Must comply with updated fire safety norms |
🗓️ Compliance Timeline
- Amendments Effective: 23 September 2025
- Old Versions Valid Until: 22 March 2026
- Industries must transition within 6 months to ensure compliance and BIS certification.
📌 Conclusion
The BIS’s amendments reflect a continued effort to enhance technical standards, public safety, and product performance across sectors. Stakeholders are advised to obtain the amended versions from BIS and implement necessary changes before March 2026 to remain compliant.