Plywood
Strong Wood is supplying only Russian fully birch plywood very often called Baltic birch plywood. The reason of calling it Baltic Birch plywood is initial supply of birch products produced from trees from the Baltic regions of Europe. Those were countries Finland, Latvia, Estonia and Russia. Later on volumes of supply of Russian birch plywood were dramatically increased. But the product is still called Baltic Birch plywood.
We supply Baltic Birch plywood because of several reasons:
- Birch is very strong material. Plywood made of birch is extremely hard and stable material providing extraordinary technical features.
- Appearance of Russian (Baltic) birch is very attractive and suitable for furniture and decoration.
- Holding strength of Baltic birch plywood is real good.
We supply regular Baltic birch plywood classified the following way:
By glue.
– Exterior (WBP meaning Water Boiled Proof) or
– Interior (MR meaning Moisture Resistant) glues.
In both cases formaldehyde emission is E1 and in most cases CARB Phase 2 certified
By sizes
Available sizes are:
- 1525*1525 mm (5’*5’)
- 1220*2440 mm or 1250*2500 mm long and short grain (4’*8’)
- 1525*3050 mm or 1500*3000 mm short grain (5’*10’)
- Cut To Size is an option to be discussed
By grades
Regular grades are:
B/BB, BB/BB, BB/CP, CP/CP, CP/C sanded from two sides
C/C unsanded
Special grades and special assembly of plywood are also available.
Detailed grading rules and full quality requirements are described in GOST 3916.1-96
Simplified Russian plywood grading rules in accordance with GOST 10.55-71 and GOST 3916.1-96 are presented below:
Grade B
Grage BB
Grade CP
Grage C
| 10.55-71 | Grade B | Grade BB | Grade CP | Grade C |
|---|---|---|---|---|
| 3916.1-96 | Grade I | Grade II | Grade III | Grade IV |
| Pin knots | Not more than 3 per square meter | Allowed | Allowed | Allowed |
| Sound intergrown knots | Allowed with diameter not more than 15 mm | Allowed with diameter not more than 25 | Allowed with cracks not wider than 1,5 mm | Allowed |
| Other knots | Allowed with maximum diameter 6 mm | Allowed with maximum diameter 6 mm | Allowed with maximum diameter 6 mm | Allowed with maximum diameter 40 mm |
| Closed splits | Maximum length 200 mm | Maximum length 200 mm | Allowed | Allowed |
| Open splits | Not allowed | Allowed with maximum size 200*2 mm | Allowed with maximum size 300*2 mm | Allowed with maximum width 10 mm |
| Light discoloration | Allowed not more than 5% of the surface | Allowed | Allowed | Allowed |
| Heavy discoloration | Not allowed | Not allowed | Not allowed | Allowed |
| Glue penetration (through faces) | Not allowed | Allowed not more than 2% of the surface of the panel | Allowed not more than 5% of the surface of the panel | Allowed |
| Veneer overlapping | Not allowed | Allowed with maximum length 100 mm | Allowed with maximum length 200 mm | Allowed |
| Repairing by plugs | Not allowed | Allowed with single plugs | Allowed with double plugs | Allowed with double plugs |
| Sanding through faces | Not allowed | Not allowed | Not allowed | Allowed |