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General Instructions for FRP Compression-molded Products
1. Regarding Mechanical Indicators
For FRP compression-molded products, the mechanical indicators are positively correlated with the content of glass fibers in the raw material SMC. Without special requirements, the glass fiber content is generally around 22%. The corresponding tensile strength is generally greater than 50MPa, and the flexural strength is generally greater than 150MPa, subject to the finished product test.
2. Regarding Flame Retardancy
For products with flame retardancy requirements, the oxygen index can generally be made to be above 32. Of course, a higher oxygen index can also be achieved, subject to specific requirements.
3. Regarding Errors
Under normal circumstances, the dimensional error is approximately 0.3 millimeters. However, in the case of long strip-shaped and flat-shaped compression-molded products, the error may sometimes exceed 0.5mm.
4. Regarding Surface Coatings
(1) FRP products molded without a coating are generally not recommended for direct outdoor use. Due to long-term weathering, the surface layer of the products will be powdered. When viewed from the side against the light, many shiny fibers can be seen.
(2) For products such as compression-molded water channels, since an aesthetic appearance is not required, it is sufficient to leave enough corrosion allowance during the design.
(3) For highway anti-glare panels, in order to avoid powdering, the current surface coating is a combination of a chicken skin texture on the product surface and powder spraying. This coating is a patented technology that can ensure that the appearance will not be powdered within 8 years. That is to say, theoretically, the FRP body inside the coating will not be eroded until 8 years later, and the overall appearance can withstand more than 20 years. This is a cost-balanced solution because this technology does not require a high cost.
(4) The best way to ensure that the product appearance is not eroded by wind and rain is, of course, baking paint, which is currently the most costly manufacturing method. This is commonly seen in the outer shell parts of trucks.
(5) The product uses high-grade color paste instead of a coating to resist ultraviolet rays and weathering. For example, aviation warning balls use this technology. To some extent, this is also a kind of attempt because aviation warning balls place more emphasis on not fading rather than surface powdering.
5. Regarding Molds
For these compression-molded products, there must be a sufficient quantity of demand to be able to share the cost of the molds. Of course, for products for which we already have molds, they can be directly purchased without any quantity restrictions.
6. Regarding the Maximum Size of Compression-molded Products
Our company can undertake compression-molded products with a maximum size of 4000×3000. However, it is worth mentioning that the larger the product, the higher the mold cost and test cost.
7. Regarding the Transport Volume
The products uploaded by our company have already taken into account how to minimize the overall volume during transportation. For box-shaped compression-molded products, slopes have been considered to minimize the overall volume when stacking. If you must purchase box-shaped products with a square shape, the freight may be higher than the product price.
8. Regarding Design
Many people may still not be able to find where these products are used from the products we have uploaded. In fact, if you can find the previous metal products in our company or in this project and replace them with these FRP compression-molded products, it will be a good design. For example, we replaced the original aluminum shell at the rear of the searchlight with an FRP compression-molded one, and replaced the wheel arches on both sides of the tractor seat made of iron sheet with FRP ones. These are all good designs.
