Long working window
Stabilizer systems keep the dough plastic inside the storage window and limit viscosity drift.
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BMC · OEM COMPOUND
BMC Bulk Molding Compound
Alita BMC (DMC) is an OEM bulk molding compound for injection and compression. We do not stock catalog grades. Flow, flame rating, electrical properties and color are set to your part — encapsulated motors, insulation components, reflectors — then locked after sample approval.
Injection / Compression
Insulation & Flame Grades
Color & Formula OEM
WHAT IS BMC
A dough compound, not a smaller SMC sheet
BMC (Bulk Molding Compound, also called DMC) premixes unsaturated polyester resin, chopped glass, fillers, stabilizers and pigments into a handleable dough. Versus SMC sheet, BMC uses shorter fiber and flows farther — the right choice for complex cavities, insert encapsulation and injection molding, especially encapsulated motors and precision electrical parts.
- Ready for the pressResin, fiber and additives are already mixed and matured in-house. Downstream only injects or compresses inside the process window.
- Formulated for the part, not a SKU listEach batch is written to the target flow, shrink, flame and electrical window — not picked as the nearest catalog grade.
- Color can follow a chipNatural, black, red, orange, green and brown are production colors. RAL / Pantone matching is available after a sample lock.
COMPOUND ADVANTAGE
What the dough is built to do
Easy handling, high flow
Chopped fiber and filler ratios are set to the cavity — thin walls, inserts and complex ribs.
Strength, insulation, flame
Glass-reinforced UPR matrix, UL94 V-0 capable, with electrical strength held in the same formula.
Low shrink, high yield
Shrinkage is tuned to the dimensional tolerance window to cut flash and secondary work.
Surface gloss on demand
From functional matte to appearance gloss, adjusted with the tool and the paste system.
COLOR MATCHING
Color-matched compound
Production colors shot in-house. Final shade shifts slightly with resin, filler and flame package — color is locked after the sample.
Blue and yellow shown in the group photo can be made as well. Send a chip, a part, or a RAL/Pantone number and we lock color by batch.
OEM WINDOW
OEM property window
This is not a single catalog grade. It is the envelope Alita can lock to a part. Fill only the properties that matter in the form below; the rest is recommended from the application and written into the datasheet after sampling.
Physical
- Density
- 1.80–2.20 g/cm³
- Water absorption
- ≤ 0.15 %
- Mold shrinkage
- 0.05–0.20 %
- Flow
- 500–900 mm
Mechanical
- Flexural strength
- ≥ 70 MPa
- Tensile strength
- ≥ 25 MPa
- Impact strength (IZOD)
- ≥ 20 kJ/m²
- Elongation at break
- 1.0–2.0 %
Thermal / Electrical / Flame
- HDT (1.8 MPa)
- ≥ 200 °C
- Electrical strength
- ≥ 12 kV/mm
- Insulation resistance
- ≥ 1.0×10¹³ Ω
- Arc resistance
- ≥ 180 s
- Proof tracking index (PTI)
- 600
- Glow-wire GWIT
- 750–960 °C
- Flame rating
- HB / V-1 / V-0 UL94
Typical injection window (starting point — adjust to the part)
Upper mold temp.115–130 °C
Lower mold temp.125–140 °C
Molding pressure8–12 MPa
Cure time120–160 s
DOWNSTREAM PARTS
Typical downstream parts
BMC is used where insulation, flame performance, dimensional stability and complex cavities coincide. Alita can compound the dough and mold the part, from material sample to first-off.
HANDLING
Handling, packing and storage
BMC is a reactive semi-finished compound. How it is handled and stored decides flow on the machine and surface on the part.
Sealed and cool
Store sealed below 18°C, dry and away from sunlight. Reseal the PE/nylon bag after every take-out to limit moisture and volatiles.
Keep it clean
Avoid skin and eye contact. Keep gloves clean so dust and oil never enter the dough.
Run inside the window
Temperature, pressure and cure must follow wall thickness and the tool. The numbers below are a starting point, not a frozen grade.
CUSTOM BMC TDS
Submit a custom BMC specification
Write the part you are actually molding. You do not need every cell — application, process and contact are required. Blank properties mean we recommend from the use case and lock them after sampling.