Author: Plywood

The film faced plywood are mostly used as a concrete forming panels in the construction site. It is supported with LVL beams and poured with concrete. After the concrete cure, the film faced plywood can be taken from it.

There are common problems with the film faced plywood used for concrete shuttering.

Film Crack

The bad quality film will crack under sunshine and rain. The main reason is the overlay film is not waterproof. Water can go through the filml so quickly that it swell the board before it is used.

How to fix this? Must use phenolic coated film with better thickness

Edge Swell

The plywood edge becomes uneven when they are layed up on the timber beams. The main reason is the rain goes into the veneer through the glue line at the edges. Edges are not protected well. This is a major problem because the uneven platform will not create an even concrete finish.

How to fix this? Must seal the edge with waterproof paint to stop the water going inside the plywood veneers.

Bending

Plywood bending within the tolerance are acceptable. If the bending is too much, formworkers have to reject it for concrete use. It becomes unfit for the job.

Delamination

Delamination happens when you use the plywood too many times when it is not bonded with a permanent phenolic glue. Formwork is a temporary construction and it does not require the plywood to be structural. But if you can make the plywood structural with phenolic adhesive then it is better for many problems.

There are different glue types used for marineplex. They can be UF, Melamine UF or Phenolic glue.

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Looking to buy film faced plywood from Chinese suppliers? Contact us for a quote.

China National Standard for concrete form plywood was first published in 1999, revised in 2008, and revised in 2018 to GB/T 17656-2018.

It was first proposed by State Forestry and Grassland Administration of China.

The new standard was lead by China Forestry Science Academe Wood Industry Institute. Also some plywood manufacturers, glue manufacturers, construction companies, universities, are involved in the draft of the standard.

1. Scope

GB/T 17656-2018 stipulates terms, defination, classification, test method, marking, packaing, transportation and storage of plywood for concrete forming.

2. Related Standards

• GB/T 9846-2015 Ordinary Plywood
• GB/T 17657-2013 Physical and chemical test method of wood based panels
• GB/T 18259 Terms for wood panels and decorative surfaces
• GB/T 19367 Size measurement of wood based panels

3. Terms and Defination

3.1 Plywood For Concrete Form

Plywood that can pass water boiling test and can be used for concrete forming cast

3.2 Modular System

4. Classification

The form plywood can be classified into three types according to its surfaces

4.1 Raw Face Plywood

4.2 Phenolic Faced Plywood

4.3 Phenolic Coated Film Faced Plywood

5. Requirement

5.1 Wood Species

The veneer used for concrete forming plywood can be Pinus massoniana, Pinus yunnanensis, Larix gmelinii, Radiata pine, poplar, eucalyptus, birch, luan, Aucoumea, Keruing, Gurjan, Apitong, etc.

5.2 Panel Structure

Wood grain of adjacent veneers should cross with each other. Same layer should use same wood species veneer. Any tape used for fixing plywood should be removed.

5.3 Adhesive Glue

The glue for concrete form plywood shoud use phenolic resin or similar glue.

5.4 Plywood Sizes

915*1830mm, 1220*1880mm, 915*2135mm, 1220*2440mm, 1250*2500mm

Length and width tolerances are +-2mm

5.5 Visual Quality

Overlap of film in the film faced plywood is not permitted. The largest crystalation of film should not be bigger than 100 mm2.

Plywood should be sanded unless stipulated in sales contract.

Film faced plywood shoud have 2 faces with film. Both sides film should be same quality.

5.6 Physical Performance

Moisture content 5-14%

Bonding strength >=0.70MPa

6. Test Method

3 pieces of 600*600mm samples are cut from a whole piece of film faced plywood. Mark the directions of samples.

Use visual the check the defects of the plywood.

Moisture Content test by GB/T 17657-2013.

Phenolic board is a different name for film faced plywood. It is a term that is especially used in philippines. The reason that pinoy use it is because the black film coated on the plywood surfaces are actually phenolic resin coated.

The Philippines was named in honor of King Philip II of Spain. Spanish explorer Ruy López de Villalobos, during his expedition in 1542, named the islands of Leyte and Samar Felipinas after the then-Prince of Asturias. Eventually the name Las Islas Filipinas was to be used to cover all the islands of the archipelago.

The Philippines is a founding member of the UN, WTO, Association of Southeast Asian Nations, the Asia-Pacific Economic Cooperation forum, and the East Asia Summit. It also hosts the headquarters of the Asian Development Bank. The Philippines is considered to be an emerging market and a newly industrialized country, which has an economy transitioning from being based on agriculture to one based more on services and manufacturing. Along with East Timor, the Philippines is one of Southeast Asia’s predominantly Christian nations.

Building Market Demand For Plywood

The fast growing economy is demanding a lot of construction work in major cities of the philippines. Condo, apartments, hospitals, hotels requires huge amount of formwork and concrete jobs. The good quality film faced plywood and phenolic board is needed by the formwork companies. As a main supplier of goods, China is playing big role in supplying building material for this country.

Super Thin Film faced plywood

Thin marineplex is not easy to produce. Only a few factories are producing thin film faced plywood like 3.6mm and 4.0mm .They also producing 6,5; 9; 12; 15; 17,18; 21; 24; 27; 30; 35; 40; 50; 60 mm. The thinner ply are easily rejected because of the blisters or bubbles.

Size Tolerance

Size and right angle tolerance meets the customers’s quality requirements. Cut to size sheets and machining available in accordance with the customers’ requirements.

Phenolic Coated Film Colors

Normally chestnut brown or dark brown, also light brown transparent, dark brown, yellow non– transparent and transparent, green, colourless, black, grey, red. More colours on request. Under transparent films BB grade veneer is applied.

• yellow non-transparent – 167 g/m²
• red – 220 g/m²
• grey – 170 g/m²
• Light brown transparent – 120 g/m²
• black – 120 g/m²
• green – 120 g/m²

Glue Standards

Plywood is glued with waterproof phenol formaldehyde resin adhesive. Bonding is resistant to weather and boiling water. It meets requirements of the following standards:

• EN 314 / 3rd class;
• BS 1203 / H4 (previously WBP);
• DIN 68705 Part 3 / type BFU 100.

Edge Sealing

Edges of the marineplex are matched with the face against absorption of moisture by using acrylic paint. Many colors are available.