Flat / brix 25 × 25 × 17 mm
Footprint × height, ±0.3 mm per side. Of the flats we press it is the taller one — the same footprint at more height. Pieces per kilogram: on request — our roster does not publish one for this size, so this page prints no count and no weight per piece derived from one.
Flat and brix are the same shape. Both names are in use and the roster carries both, so a request under either reaches this row. The two sizes share one footprint and differ only in height, which is the part of the decision a foil or a heat-management device actually feels.
By Mohamad Sinno, Charcoal Expert.
The card
Every row names the block it comes from. Where a block records nothing for this size, the cell says so — we do not carry a figure across from the size above it.
| Item | This size | Source |
|---|---|---|
| Shape | Flat / brix | P28 |
| Size | 25 × 25 × 17 mm (footprint × height) | P28 |
| Pieces per kilogram | On request — P28 records no count for this size | P28 |
| Tolerance | ±0.3 mm per side | P28 |
| Minimum order | 1 × FCL (20 ft or 40 ft); minimum 2 tonnes per shape, size and packaging variant | P8 |
| Inner box, 1 kg | Not recorded — ask the export desk | P30 |
| Master carton | Not recorded — ask the export desk | P30 |
| House-brand retail boxes | Not recorded — ask the export desk | P38 |
| Trade names | Flat and brix are the market’s two names for this shape; the roster carries both | P28 |
| Master carton mark | Our master cartons carry a UN 4G fibreboard-box mark of a packing-group-III design. The packaging certificate is available to buyers on request. | P57 |
| Carton code | a four-digit batch production code, two letters identifying the packing team, and one check digit. Inner-box marking: not recorded. | P48 |
Grades and price basis
| Grade | Ash ceiling | Boxed, USD/t | Bulk, USD/t |
|---|---|---|---|
| Diamond | 1.2–1.6% | 1900 | 1820 |
| Platinum | 1.6–1.9% | 1800 | 1720 |
| Super Premium | 1.9–2.3% | 1750 | 1670 |
| Premium | 2.3–2.5% | 1700 | 1620 |
| Regular | 2.5–3.0% | 1650 | 1570 |
FOB Tanjung Priok · Prices valid September 2026 · reviewed monthly. These prices are indicative and dated, not an offer. A binding figure comes on a proforma invoice against your shape, size, packaging and destination.
Ash is the band that names each grade, and the batch certificate is what proves it. Size does not change the per-tonne price — see wholesale pricing.
What the laboratory measured
Ash, fixed carbon, volatile matter and moisture are reported per batch on a certificate of analysis — what one proves, and how to verify the laboratory.
What is not measured per size. Burning time, ash colour and breakage rate are recorded per batch, not per size, so this page publishes none of them against 25 × 25 × 17 mm. Burning time in particular has no stated test conditions here — the method page sets out what any minutes figure has to name before it means anything, ours included.
What fits in a container
| Equipment | Payload | Master cartons |
|---|---|---|
| 20 ft | 18.5 t | 1,850 — derived |
| 40 ft | 26.5 t | 2,650 — derived |
A 20 ft cubes out before it weighs out and a 40 ft weighs out before it cubes out, which is why the 40 ft figure is the same for every shape. Stowage: cartons go inside a thermal blanket, vacuum-sealed, 15–30 cm of headspace and 30 cm at the door. The cargo ships as UN 1361, Class 4.2, Packing Group III — how it is declared and booked, and what a container costs to move.
Pallet plan: on request. The pallet configuration for this size is not recorded on our data sheet yet, so there is no diagram here to show you.
Packaging routes
Your own design, a house-branded box, a plain box or bulk: every packaging route, box dimensions in the formats matrix, and your own brand through the private-label programme.
Sample this size, then quote it
How sampling works, and on what terms; the window for quality and quantity claims is set out in our quality guarantee.
Quote flat / brix 25 × 25 × 17 mm on WhatsApp
Questions buyers ask about the flats
- Why is there no pieces-per-kilogram figure for this size?
- Because our roster does not record one. The count is taken at the packing line and, for the extrusion sizes, answered per enquiry rather than published. Ask the export desk against the size and packaging you are quoting; what you will not get here is a number carried across from a neighbouring size.
- Can I order one size only, or do I have to mix?
- Either. 1 × FCL (20 ft or 40 ft), and inside it the minimum is 2 tonnes per shape, size and packaging variant. So a single-size container is fine, and so is a container split across sizes and packaging as long as each variant reaches two tonnes.
- Why is there no burn time on this page?
- Because the test conditions behind a minutes figure are not written down here, and a number without them is not a specification. Burning time is recorded per batch in the factory QC file; what is missing is the ambient, the burner type and the single-piece-versus-bowl basis that would make one comparable to anyone else's.
- What does the price depend on?
- Grade and packaging. The five bands below are ash ceilings, and each has a boxed price and a bulk price; the basis is FOB Tanjung Priok. Shape and size do not move the per-tonne price — they move how much fits in the container, which is the section above.
- Can I have my own brand on the box?
- Yes. Minimum 2 t per SKU (≈2,000 inner boxes or 200 masters at 1 kg) applies, plate and setup are inside the quoted price, and artwork goes through the dielines we supply. House-branded boxes are the faster route where they exist in your size.
The other flat / brix sizes
| Size | Pieces per kg | 20 ft payload |
|---|---|---|
| Flat / brix 25 × 25 × 15 mm | on request | 18.5 t |
Every shape and size we press: the catalogue. Choosing between formats rather than sizes: flats and the devices they are bought for.