BMC and SMC(sheet molding compound) are similar in composition. But for BMC moulding, firstly, it should be mixed the polyester resin and additives. After this step, it becomes a resin mixture, and then adds the filler. Next, reduce the mixing speed of the "premix" to prevent the glass fiber from cracking. If the material needs to be further concentrated, a thickener should be added. This material can be used for compression moulding and injection moulding.
The development history: In the early 1960s, BMC materials were developed by British BIP Company and American R&H Company with low shrinkage and non-shrinkage BMC, which greatly improved the dimensional stability, smoothness and appearance of the material. Polyester moulded plastic. In the 1970s, applications requiring dimensional accuracy, high rigidity and heat resistance, such as office machine stand. In the mid-1980s, to expand the range of applications, freely colourable BMCs were developed.
Proportionally, the BMC material is mainly composed of three parts. It consists of matrix resin – unsaturated polyester resin and low shrinkage system, reinforcing material – mainly glass fibre, filler – calcium carbonate, talc, aluminium hydroxide, china clay, etc. Although the amount of these components account for a small proportion of the total components, they play a very special role in the formulation system of BMC. They will have an important impact on the preparation process, product moulding and final properties of BMC.
Glycol; Typical Acids used are like acid, isophthalic acid, TerephThalic Acid, and Maleic Acid Anhydride.
shrinkage.
Initiator
SOME SPECIAL Requirements of the Product, Such As Excessive Tempeature Will Damage the Product.
Chemical Thicker: Calcium Hydroxide
High Viscosity.
Internet release agent
Commonly usernal release agents are zinc Steaite (znst), Calcium Steaite (Cast) or Fluorine.
Colourant
How many, the Common Colornts Will Appear in Color Separation, Fading and Other Phenomena in High Tempeature and High-Pressure Flow.
SPECIAL Additives
processes.
Why Chy Choose Chopped Fiber Bulk Molding Compounds? Bulk Molding Compounds Offer Several Advantages Over Metal.
The BMC Composite Material has a Short Moulding Cycle and Can Be Compression Moulded, Or inject MoulDed, Suitable for Mass Production.
A Large Number of Fillers Can Be Added to the MOULDING of BMC Composite Materials to Meet the Requirements of Flame RETARDANCY and DIMENSIONLITY, and The Cost is Low.
High Mechanical FORCE and Stiffness Not only Under Static Load But Also Under Dynamic Load
Compared with complatics, BMC Molded Products Higher Heat Resistance, Insulation and Elastic Modulus.
Due to low worker skills, bmc composites are easier to automate, saving labour.
Products using bmc composits are dimensionally accurate.
Chemical Resistance
High Electrical Properties (Insulation)
Has good measurements
BMC Composite Materials are only Suitable for ManuFacturing Products with Small Size and Low Stringth Requirements (usually, The Streangth is About 30% Lower OF SMC).
The price of an injecting machine is higher.
Almost All Automotive Headlight Reflectors Are Made of BMC; Automotive iGniters, Partitions and Trim Panels, Speaker Boxes, ETC.;
High-Voltage Insulation for Large or Small HouseHold Appliance Parts Such as Microwave Tableware, Shells of Electric Soldering, ETC. Light Industry: Pump Housings
Structural parts in theerospace industry, Such as radomes, fairings, pipes, ETC. ETC.
BMC Electrical Box Mould, BMC Meter Box Mould and BMC Manhole Cover Mould, ETC.
Compression MOULDINGBMC MOLDING Manufacturer
Injection Moulding (Fully Automatic, BMC Molding ManuFactuer Including Over-MOULDING of Inserts))
Transfer Moulding
injecting compression modes