IS 3346 : 2026
Method for the Determination of Thermal Conductivity of Thermal Insulation Materials (Guarded Hot - Plate Method) (Second Revision)
Current edition: 2026
BIS department: CHD
What this standard covers
This standard prescribes the general procedures for determining the thermal conductivity of dry specimens of thermal insulating materials, building and other materials provided that: a) the materials are homogeneous and sufficiently uniform with regard to their aggregates and pores; b) the thermal conductance of the specimen does not exceed 60 W/m2K; and c) the two specimens used for test are...
Scope, quoted from IS 3346 : 1980 — the 1980 edition in the public archive, not the current IS 3346 : 2026. Read the full standard
The BIS registry lists the current edition as IS 3346 : 2026. The publicly archived copy quoted here is the 1980 edition, so wording and requirements may have changed since. Check the official BIS listing for what is in force.
How the standard is organised
- 2 GENERAL
- 3 LOW-TEMPERATURE HOT PLATE
- 4 HIGH-TEMPERATURE HOT PLATE
- 5 TEST SPECIMENS
- 6 PROCEDURE
- 7 CALCULATIONS
- 8 REPORT
Test methods it refers to
- IS 3346
Edition history (per the BIS registry)
- IS 3346 : 2026 — current edition
Where this standard is used on NirmanDost
CPWD DSR 2021 (Civil Works)
| Item code | Description (verbatim) |
|---|---|
| 26.7 | Providing and fixing 50 mm thick extruded polystyrene rigid insulation board of required size between cavity wall, complying with ISO 4898:2008 & ASTM C 578-08b - type VI, having thermal conductivity of 0.0289 W/m K as … |
| 26.8 | Providing and fixing 50 mm thick extruded polystyrene rigid insulation board of required size underdeck on ceiling surface, complying with ISO 4898:2008 & ASTM C 578-08b - type VI, having thermal conductivity of 0.0289 … |
| 26.67 | Providing and fixing of external thermal insulation and composite system with First layer of self-extinguishing type Expanded Polystyrene (EPS) insulation boards of 120 mm thick (max 1mX0.5m section), confirming to IS 46… |
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Listed by product makers
3 products in the NirmanDost catalogue name this standard on their spec sheets — ROCKINSUL Building Rolls, ROCKINSUL RB Slabs, TUFFINSUL Rigid Slabs. That is the maker’s own claim, copied as printed; we have not tested these products against the standard, and a spec sheet can cite the wrong code.
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Notes
- Status and titles come from the official BIS published/withdrawn standards registry (standards.bis.gov.in exports, July 2026 snapshot). Editions change — verify on the BIS portal before contractual use.
- The standard text is copyright BIS. NirmanDost shows registry metadata and links to the official source only — it never rehosts the document.
- Generated 2026-07-27.