PP Corrugated Formwork Board is an energy-saving and green environmental protection product. It is another new generation product after wood formwork, combined steel formwork, bamboo and wood veneer formwork and all steel large formwork. It can completely replace the traditional steel formwork, wood formwork and square wood, save energy and protect the environment, and has low amortization cost.
This standard specifies the types, requirements, inspection methods, inspection rules, signs, packaging, transportation, and storage of hollow plastic building templates.
This standard applies to hollow plastic building templates.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the new version (including all amendments) applies to this document.
GB / T 1040.2-2006 Determination of tensile properties of plastics. Part 2: Test conditions for molded and extruded plastics
GB / T 1043.1-2008 Plastics-Determination of impact properties of simply supported beams
GB / T 2828.10-2010 Counting sampling inspection procedure
GB 8624-2006 Classification of combustion performance of building materials and products (Chinese standard classification)
GB / T9341-2008 Plastics-Determination of flexural properties
3 Product classification
3.1 According to materials: polycarbonate (PC) and polypropylene (PP).
3.2 According to the external dimensions, the requirements in Table 1.
|Length x Width (mm)||Thickness (mm)||Tolerance (mm)|
|Remark: Products of other formats are executed according to the contract|
Smooth layer thickness (mm): PC1.4 PP1.6
Smooth layer thickness (mm): 1.1
4 Physical properties
4.1 Appearance quality: The surface of the template should be relatively smooth and flat; no obvious cracks, scars, bumps, holes, air bubbles, burrs, pitting and other defects.
4.2 Each performance index shall meet the requirements shown in Tables 2 and 3.
Table 2 ((Polycarbonate PC Hollow Formwork)
|2||Impact strength of simply supported beam||≥45KJ / ㎡|
|5||Retraction rate 80 ℃ × 168h||≤0.25%|
|6||High temperature resistance test 80 ℃ × 10min||No change in appearance, no cracks|
|7||Artificial weathering test 168h||No change in appearance, no cracks|
|8||Acid corrosion resistance 168h 10% H2SO4||No change in appearance, no cracks|
|9||Nail holding force (board surface)||≥2850N|
|10||Combustion performance level (B2)||Within 20s after the ignition started, the flame tip did not reach the scale line and no drips were generated|
Table 3 (Polypropylene/PP Corrugated Formwork Board)
|2||Impact strength of simply supported beam||≥21.0KJ / ㎡|
|4||Flexural modulus||≥1100 Mpa|
|5||Retraction rate (longitudinal) 80 ℃ × 168h||≤1.0%|
|6||Retraction rate (transverse) 80 ℃ × 168h||≤0.8%|
|7||Gripping screw force (board surface)||≥1000N|
5 Test Methods
5.1 Testing methods for specifications: Vernier calipers and tape measure using general legal measuring instruments.
5.2 Appearance: feel by hand and visual inspection.
5.3 Tensile strength: According to GB / T1040.2-2006 (Part 2)
5.4 Impact strength of simply supported beam: according to GB / T 1043.1-2008
5.5 Bending strength: According to GB / T9341-2008
5.6 Bending elastic modulus: According to GB / T9341-2008
5.7 Retraction rate: 168 hours at 80 ℃, measure its size and compare with the test before the test
5.8 High temperature resistance test: leave it at 80 ℃ for 10 minutes, and observe whether the appearance changes and cracks
5.9 Artificial weathering test: Leave it at normal temperature for 160 hours, and observe whether there is any change in appearance and cracks.
5.10 Resistance to acid and alkali corrosion: Put it in 10% H2SO4 for 168 hours, and observe its appearance for changes and cracks
5.11 Nail holding force (board surface): The nail is inserted into the surface of the board, and the force required to pull out the nail is measured with a test force instrument.
5.12 Combustion performance level (B2): Ignition test of the product, no dripping within 20S
6 Inspection methods and determination principles
6.1 Batch sampling
The product quality inspection of the hollow plastic building template shall be based on the same batch of products, and samples shall be taken according to regulations, and the samples taken shall be inspected one by one.
Group batches are based on one day’s output.
6.2 Specimen size inspection sampling
GB / T 2828.10-2010 count sampling inspection is used for inspection sampling,
6.3 Inspection classification
Inspection points for factory inspection and type inspection
6.3.1 Factory inspection
220.127.116.11 Each batch of products must be sampled and inspected by the company’s quality inspection department in accordance with this standard.
18.104.22.168 The factory inspection items are: appearance quality, specifications, tensile strength in physical and chemical indicators, impact strength of simply supported beams, and bending strength.
6.3.2 Type inspection
22.214.171.124 The type inspection pattern shall be drawn from the factory inspection qualified product library. In any of the following cases, the type inspection shall be performed:
a) When new products are put into production or converted
b) When there are major changes in raw and auxiliary materials and processes
c) When production is stopped for more than three months, when production is resumed
d) during normal production, twice a year
e) When the quality supervision agency requests formal inspection
6.4 Judgment method
The product appearance quality, specifications and physical and chemical performance test results all meet the corresponding level requirements to judge the batch of products as qualified, otherwise re-inspection, and finally determine whether the product is qualified.
7 Marking, packaging, transportation and storage
7.1.1 The product shall be stamped with the product, batch number and inspector code.
7.1.2 Each package shall indicate the name of the manufacturer, communication address, product name, implementation standards, trademarks, specifications, etc.
Products should be packed separately according to different specifications
The mode of transport shall be agreed upon between the supplier and the buyer.
The storage foundation of the product must be flat, neatly stacked, and stacked separately according to different specifications. The stacking height should not exceed 1.5 meters. Each stack should be marked accordingly.