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Sapphire HDHMR Board (High Density High Moisture Resistant Board)
High Density High Moisture Resistant board — a homogeneous panel with no grain and no core voids, for painted, routed and membrane-pressed joinery.
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GPI
GPI ISI Certified Block Board (Boric Acid Treated)
IS 1659:2004 block board in 19 and 25 mm, boric acid treated, available in MR and BWP core grades with a 25 year guarantee.
- Standard
- IS 1659:2004
- Licence
- CM/L-9300177011
- Thicknesses
- 19 mm, 25 mm
- Core grades
- MR-CORE, BWP-CORE
- Treatment
- Boric acid treated
- Guarantee
- 25 years
Check this against the sheet
Marked IS 1659:2004 under BIS licence CM/L-9300177011. The same numbers are stamped on every sheet — confirm them on delivery against this page.
Available grades
- MR-CORE
- BWP-CORE
Enquire about this product
Rate depends on thickness, grade and quantity. Send the specification — or just the room it is going in — and we will come back within one working day.
Overview
About this product
GPI block board is ISI certified to IS 1659:2004 under licence CM/L-9300177011, supplied in 19 mm and 25 mm thicknesses across six sheet sizes and in both MR-core and BWP-core grades.
The core is softwood battens laid edge to edge and faced both sides. That construction is lighter and stiffer per unit weight than plywood, which is why it is the standard choice for tall wardrobe shutters, door leaves and long unsupported shelves.
It is boric acid treated, giving natural resistance to termite and borer attack through the full thickness of the core rather than as a surface coating, and carries a 25 year guarantee from an ISO 9001:2015 certified process.
Why it is specified
Benefits
- Resists sag over a long span far better than plywood of the same thickness
- Lighter shutters mean less strain on hinges and easier installation
- BWP core option available where the shutter is in a wet area
- Boric treatment protects the core itself, which is what borers attack
Features
What the construction gives you
Each of these is a build decision, not a marketing line — and each one changes how the panel behaves on site.
IS 1659:2004 certified
ISI marked under licence CM/L-9300177011.
Boric acid treated
Termite and borer resistance through the core, not a surface coat.
MR and BWP core grades
Choose the core bond to match the location.
Six sheet sizes
From 1830 × 920 mm to 2440 × 1220 mm.
19 and 25 mm
The two thicknesses that shutter and shelf work actually use.
25 year guarantee
From an ISO 9001:2015 certified process.
| Standard | IS 1659:2004 |
|---|---|
| Licence number | CM/L-9300177011 |
| Thicknesses | 19 mm, 25 mm |
| Sheet sizes | 2440 × 1220, 2440 × 920, 2140 × 1220, 2140 × 920, 1840 × 1220, 1830 × 920 mm |
| Core grades | MR-CORE, BWP-CORE |
| Core | Softwood batten, boric acid treated |
| Certification | ISO 9001:2015 |
| Guarantee | 25 years |
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Marked and traceable
IS code, BIS licence number, grade and batch stamped on the sheet — check it against what you were quoted.
Consistent between batches
Sourced from ISO 9001:2015 certified processes, so a repeat order behaves like the first one.
Written warranties
Manufacturer guarantees of 25 to 30 years against manufacturing defects across the range.
Answered in a working day
Send a cutting list, a drawing or a photo. Enquiries on a working day are answered the same day or the next.
Enquire
Ask for a price on GPI ISI Certified Block Board (Boric Acid Treated)
Tell us the thickness, grade and quantity you need and we will send a current rate with availability, within one working day. Not sure it is the right board? Describe the space and we will confirm it — or point you at a cheaper one that does the job.