What’s The Differences Between BMC And SMC Materials?

Telecom fiber vaults?were born when the strength of traditional chambers made of concrete and brick were combined with the easy handling and versatility of plastic ones. This innovation has made the duct access chambers to successfully perform in infrastructure such as ?highways, roads, airports, railways / trams, housing and industrial development , photovoltaic/ thermo-solar as well as drainage and sewage. SMC and BMC are very popular material for making fiber manhole/handhole, what's the different between the two different kinds of materials? Today we would like to share you those informaiton as below:?

Strength Requirement

BMC: The general strength is relatively low, about 30% lower than SMC, suitable for products with low strength requirements, such as small electrical housings and some auto parts. (such as speaker housing, etc.)

SMC: high strength, such as directional glass fiber reinforced SMC composite bending strength can reach more than 400MPa, can be used for products with high strength requirements, such as large auto parts (such as bumpers, roofs, etc.), building templates, etc.

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Dimensional Stability

BMC: Small linear expansion coefficient, (1.3-3.5)×10??K?1, high dimensional stability, little influence by temperature, but the influence of humidity is greater, will expand after moisture absorption, suitable for high dimensional accuracy requirements and small changes in environmental humidity occasions.

SMC: Thermosetting resin matrix is heated in the processing process to form a network structure, the product size is stable under normal conditions, small shrinkage after forming, small change in shape and size under long-term continuous load, creep is small, suitable for dimensional stability requirements of the product.

Heat Resistance

BMC: Good heat resistance, thermal deformation temperature HDT is 200-280 ° C, can be used at 130 ° C for a long time, can meet the needs of some products working in a higher temperature environment.

SMC: The heat resistance is also relatively superior, the heat resistance of the product is stable, the heat deformation temperature is also in a higher range, the specific value is different due to the formula and process, often used in the heat resistance requirements of the occasion, such as the peripheral parts of the automobile engine, the electronic equipment housing in high temperature environment.

Resistance To Water And Solvents

BMC: It has good corrosion resistance to water, ethanol, aliphatic hydrocarbons, fats, oils, etc., but it is not resistant to ketones, chlorinated hydrocarbons, aromatic hydrocarbons, acids and bases.

SMC: It also has a good tolerance to water and general chemicals, but the tolerance in some highly corrosive solvents may vary according to the specific formula, and it is necessary to select or perform special treatment according to the actual situation in the environment with high chemical resistance requirements.

Product Shape And Structural Complexity

BMC: good fluidity, suitable for the production of complex shape, small size products, and complex products can be molded as a whole, inserts, holes, tables, ribs, grooves, etc. can be molded at the same time, to meet the diversification and refinement requirements of product structure design, such as some small electrical shell with complex internal structure, precision instrument parts and so on.

SMC: relatively poor mobility, more suitable for the production of relatively simple shape, large size or structured products, such as flat, large-area plate products (building roof water tank plate, purification tank, etc.), large automotive parts (body plate, roof, etc.)

Production Process And Equipment

BMC: Molding, transfer molding, injection molding and other processes can be used, among which injection molding has been used more in recent years. If the company already has equipment suitable for these processes, and the products produced are suitable for the performance characteristics of BMC, the selection of BMC materials can make full use of the existing equipment and reduce the equipment investment cost. However, the BMC injection molding machine needs to attach an extruded feeding device, and the injection molding system may have inconvenient exhaust, and attention should be paid to the equipment selection and process control.

SMC: Mainly adopts molding process. The production of SMC products requires a special SMC production line and supporting molding equipment, and the equipment investment is relatively large. However, if the enterprise has large-scale production and the product is suitable for the performance and process characteristics of SMC, in the long run, the cost per unit product can be reduced through scale effects.

Cost Budget

BMC: The glass fiber content in BMC is relatively low, more fillers can be added, and can meet the performance requirements of some products, under the premise of meeting the performance requirements, the cost is relatively low, suitable for projects or products with strict cost control requirements.

SMC: Although the performance of SMC is superior to BMC in some aspects, the cost may be relatively high due to the characteristics of its production process and raw materials. SMC materials can be selected if the product has very high performance requirements and is not particularly sensitive to cost, or if the overall cost is still advantageous under the requirements of high performance.

Use Environment

BMC: has good corrosion resistance, but in some extremely harsh environments (such as strong acid and alkali, strong oxidation and other environments), its performance may be affected, the use of need to be evaluated according to the specific environment, such as in general indoor electrical equipment, ordinary industrial environment is more suitable.

SMC: With excellent corrosion resistance, it can be used in harsh environments such as acid and alkali, and is not easy to be corroded. It is suitable for environments with high corrosion resistance requirements, such as chemical equipment and outdoor building structural parts.

Product Quantity And Production Cycle

BMC: Short molding cycle, can be molded, can also be injected, suitable for mass production, can meet the needs of large-scale production, and can quickly respond to changes in market demand, such as the shell production of some consumer electronics products.

SMC: Production efficiency is also high, but relatively speaking, the preparation work and process complexity in its production process can lead to relatively long production cycles. If the product order volume is large, and the production cycle requirements are not particularly urgent, SMC is a good choice; If the production cycle requirements are very short, BMC may be more advantageous.

According to the market demand, FCST can produce BMC or SMC material Telecom Manhole Chamber. Products with different configurations are selected according to the bearing requirements and material requirements. This is very important, it determines which scene to use. See the table below for detail.

FCST - Better FTTx, Better Life.

At FCST, we manufacture top-quality microduct connectors, microduct closure, telecom manhole chambers and fiber splice boxes since 2003. Our products boast superior resistance to failure, corrosion, and deposits, and are designed for high performance in extreme temperatures. We prioritize sustainability with mechanical couplers and long-lasting durability.? Welcome to contact us for any questions or inquires.

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