Low Profile Additive (LPA) – Fits SMC/BMC Composite Applications (Microthene F Powders)
Low Profile Additive (LPA) – Fits SMC/BMC Composite Applications (Microthene F Powders) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
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Low Profile Additive (LPA) – Fits SMC/BMC Composite Applications (M...
Low Profile Additive (LPA) – Fits SMC/BMC Composite Applications (Microthene F Powders) is backordered and will ship as soon as it is back in stock.
Product Details
LyondellBasell Microthene F powders are specialized low profile additives (LPA) used in bulk molding compounds (BMC) and sheet molding compounds (SMC). They are engineered to improve surface smoothness, control shrinkage, and enhance color dispersion in fiber-reinforced polyester (FRP) composites, critical for applications in the automotive, appliance, and electrical industries.
- Installation Method: Blended directly into the resin mixture during the compounding phase.
- Material Composition: Formulated from high-quality polyethylene.
- Particle Size: Features an approximate particle size of 100 microns for effective dispersion and performance.
Compatible Applications
This additive is designed for composite manufacturing processes. Confirm your application details in the table below.
| Application | Material | Industry | Features | Notes |
|---|---|---|---|---|
| Bulk Molding Compounds (BMC) | Fiber-reinforced polyester | Automotive, Appliance, Electrical, Construction | Reduces shrinkage, Improves surface finish | Glass fiber content ~20% by weight, fiber length 0.25-0.5 in. |
| Sheet Molding Compounds (SMC) | Fiber-reinforced polyester | Automotive, Appliance, Electrical, Construction | Reduces shrinkage, Improves surface finish | Glass fiber content 30-60% by weight, fiber length 0.75-3.0 in. |
Technical Specs
- Product Type
- Low Profile Additive (LPA)
- Installation
- Blended into resin mix
- Housing Material
- Polyethylene
- Dimensions
- 15 cm x 15.5 cm x 16 cm (Box)
- Volume
- 3720 cm³
- Operating Temperature
- 120–150°C (Process temperature range)
- Other Technical Attributes
- Particle size approximately 100 microns; Insoluble in polyester resins
What’s in the Box
- Microthene F Powder (Package size not specified)
Installation Notes
For optimal results, Microthene F powder should be thoroughly blended into the polyester resin before the addition of glass fibers and other fillers. Ensure uniform dispersion within the resin mix to achieve consistent shrinkage control and surface quality. The compounding process should be managed within the recommended operating temperature range of 120–150°C.
Troubleshooting & FAQ
What is the purpose of a Low Profile Additive (LPA) like Microthene F?
It's added to SMC and BMC composites to counteract resin shrinkage during curing. This results in a dimensionally stable part with a smooth, high-quality "Class A" surface finish, which is critical in automotive and appliance manufacturing.
How does Microthene F improve surface quality?
During the heating and curing process, the polyethylene particles expand, creating microvoids within the resin matrix. This controlled expansion compensates for the natural shrinkage of the polyester resin, preventing sink marks, warpage, and other surface imperfections.
What's the difference between its use in SMC vs. BMC?
The primary difference is the glass fiber content and length. Sheet Molding Compounds (SMC) use longer fibers (0.75-3.0 in) at higher concentrations (30-60%), while Bulk Molding Compounds (BMC) use shorter fibers (0.25-0.5 in) at lower concentrations (~20%). Microthene F is effective in both systems.
Is this product soluble in polyester resin?
No, Microthene F powders are insoluble in polyester resins, which is key to their function. They remain as discrete particles that expand to create the desired low-profile effect.
What are signs of improper LPA mixing?
Poor surface finish, inconsistent color dispersion, blotchiness, or excessive shrinkage are signs that the LPA was not blended thoroughly into the resin mix before adding other components.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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