Frequently Asked Questions

Answers to common questions about rotational molding, heavy-gauge thermoforming, compression molding, industrial sewing, design engineering, and full-service manufacturing solutions.

ROTATIONAL MOLDING

THERMAL VACUUM FORMING

COMPRESSION MOLDING

DESIGN & ENGINEERING

COMMERCIAL SEWING

PRODUCTION & FULFILLMENT

ROTATIONAL MOLDING

Absolutely. Through our in-house engineering team and large-format 3D printing capabilities, we can develop prototypes to evaluate fit, function, and performance before investing in production tooling. Print area: x=1,385mm/54.5in   y=1,235mm/48.6in  z=925mm/36.4in

Redline Plastics offers a variety of value-added services, including:

  • CNC machining and trimming
  • Insert installation
  • Foam filling
  • Assembly
  • Graphics and labeling
  • Quality inspection
  • Packaging and fulfillment

These services allow customers to receive production-ready components from a single supplier.

Yes. Rotationally molded parts can be manufactured with UV-stabilized polyethylene to withstand years of outdoor exposure. UV additives help resist fading, cracking, and material degradation caused by sunlight, making them ideal for agricultural, marine, construction, and outdoor equipment applications.

Rotationally molded polyethylene generally offers excellent resistance to:

• Acids (sulfuric, hydrochloric, phosphoric, acetic, and many diluted acids)

• Alkalis and caustic solutions (sodium hydroxide, potassium hydroxide)

• Salts and brines

• Fertilizers

• Detergents and soaps

• Alcohols

• Water-based cleaning solutions

• Many agricultural chemicals

• Wastewater and sewage

• Glycols and antifreeze solutions

  • Cast aluminum
  • Fabricated aluminum or stainless steel or sheet metal
  • CNC aluminum

Yes—and it’s one of the biggest advantages of rotational molding.

Many products that begin as multiple fabricated, welded, or assembled components can often be redesigned into a single rotationally molded part. Consolidating parts not only simplifies manufacturing but can also reduce costs, improve durability, and shorten assembly time.For OEMs looking to streamline production, part consolidation is often one of the fastest ways to improve both product performance and profitability.

THERMAL VACUUM FORMING

Thick-gauge thermoforming is often the better choice for low- to medium-volume production where the cost of an injection mold cannot be justified. It offers significantly lower tooling costs and faster lead times while still producing durable, high-quality parts.

Yes. UV protection can be achieved by selecting UV-stabilized materials or adding UV inhibitors during manufacturing. Black plastic naturally provides excellent UV resistance because carbon black acts as a built-in UV stabilizer.

Redline Plastics offers complete in-house finishing services, including:

  • CNC trimming and routing
  • Assembly
  • Hardware installation
  • Inspection and quality verification
  • Packaging and fulfillment

These services help reduce lead times and simplify your supply chain.

Redline offers a variety of tooling solutions to match your project requirements, including:

  • Cast aluminum
  • Machined overcast aluminum
  • Machined billet aluminum
  • 3D-printed tooling
  • RenShape tooling

Yes. CNC machining is commonly used after forming to create precise trim lines, cutouts, holes, and other critical features.

The two largest cost drivers are part size and material selection. Production volume, tooling complexity, and secondary operations can also influence the overall cost.

Post-installed inserts and hardware are generally recommended for the best strength and accuracy. In some applications, select inserts can also be incorporated during the forming process.

To provide the most accurate quote, include:

  • Annual production volume (EAU)
  • Preferred material
  • 3D CAD model or engineering drawing (if available)
  • Part dimensions
  • Whether tooling already exists or needs to be quoted
  • Any secondary operations or assembly requirements

COMPRESSION MOLDING

Property SMC BMC
Fiber length Longer (~1 inch) Shorter (<0.25 inch)
Strength Higher mechanical strength Moderate strength
Surface Finish Superior, smooth Good but less refined
Dimensional Stability Excellent Excellent
Electrical Insulation Good Excellent (widely used in electrical parts)

Yes, Sheet Molding Compound (SMC) can effectively replace metal in many structural and industrial applications. An advanced fiber-reinforced thermoset plastic, it is widely used to substitute steel and aluminum to achieve significant weight reduction without sacrificing strength.

Why SMC Replaces Metal

• Weight Reduction: SMC parts are typically 25% to 45% lighter than their metal counterparts, which improves fuel efficiency in vehicles and lowers shipping and handling costs.

• Corrosion & Rust Resistance: Unlike traditional sheet metal, SMC will not rust or corrode, making it ideal for marine, chemical, and outdoor environments.

• Design Freedom: It can be molded into highly complex, intricate shapes. This often allows manufacturers to consolidate 20 or more separate metal pieces into a single SMC part, saving assembly time.

• Electrical & Thermal Insulation: SMC has excellent dielectric properties, which makes it a preferred material for electrical enclosures and motor brackets.

Yes, Bulk Molding Compound (BMC) can successfully replace metal in many industrial and structural applications. BMC is a reinforced thermoset plastic (typically made of polymer resin, mineral fillers, and chopped glass fibers) that provides distinct advantages over metals like aluminum, steel, and zinc.

Why BMC Can Replace Metal

• Weight Reduction: BMC parts weigh about ~40% less than aluminum.

• Design Flexibility: Complex geometric shapes with varying thicknesses and integrated fasteners can be molded in a single step, often eliminating the need to weld or assemble multiple metal pieces.

• Corrosion Resistance: Unlike traditional metals, BMC does not rust or corrode when exposed to harsh chemicals, solvents, or severe weather.

• Electrical Insulation: It is a superior dielectric material, making it ideal for electrical components.

COMMERCIAL SEWING

Commercial sewing is the manufacturing of durable textile products using industrial-grade materials, equipment, and processes. Redline produces sewn components and assemblies for OEMs across a wide range of industries.

Our industrial sewing division produces a wide variety of sewn and upholstered products, including:

  • Vehicle seat covers
  • Marine seating
  • Powersports components
  • Protective covers
  • Storage bags and organizers
  • Equipment enclosures
  • Soft-sided containers
  • Upholstered assemblies
  • Industrial textile products

Yes. We can source materials that meet specific environmental and regulatory requirements based on your product specifications.

Yes. We offer prototyping services to validate fit, function, and manufacturability before moving into full production.

We work with many industrial-grade materials, including:

  • Vinyl
  • Marine-grade fabrics
  • Coated textiles
  • Canvas
  • Polyester fabrics
  • Nylon
  • Mesh materials
  • Foam products
  • Specialty performance textiles

Our engineering team can recommend materials based on durability, environmental exposure, appearance, and cost requirements.

Yes. One of our unique advantages is our ability to integrate industrial sewing with other manufacturing capabilities, including:

  • Plastic Upholstery
  • Rotational molding
  • Thick gauge thermal vacuum forming
  • Compression molding
  • Large-format 3D printing
  • CNC machining
  • Assembly and fulfillment

This allows customers to source complete assemblies from a single manufacturing partner.

  • EAU
  • Target price
  • Sample
  • Raw material specifications
  • Patterns/DXF of cut files
  • Drawings
  • Import or Domestic
  • Bom’s (Bill of Materials)
  • Any other information

Yes. We provide complete assembly services, including hardware installation, packaging, labeling, and kitting to simplify your supply chain.

Quality is built into every stage of production. Our team follows documented manufacturing processes and inspection procedures to ensure consistency, durability, fit, and appearance throughout every production run.

Not Sure Which Manufacturing Process Fits Your Product?

Every product is unique. Here’s a quick guide to help you understand which process may be the best fit.

ROTATIONAL MOLDING

  • Hollow Parts
  • Low Tooling Cost
  • Seamless Construction
  • Large Durable Products

THERMAL VACUUM FORMING

  • Large Panels & Covers
  • Lower Tooling Investment
  • Excellent Surface Finish

  • Medium Volumes

COMPRESSION MOLDING

  • Structural Components
  • High Strength to weight ratio
  • SMC & BMC Materials
  • Metal Replacement

Your One-Stop Stategic Partner

From initial concept to final delivery, we provide end-to-end solutions under one roof.

CAD Design & Engineering

Large Format 3D Printing

Industrial Sewing

CNC Trimming

Assembly

Warehousing & Fulfillment

Don’t See Your Question?

Our engineers are ready to help.

Whether you need rotational molding, thermal vacuum forming, compression molding, commercial sewing, or a complete turnkey solution, we’re here to help move your project forward.

Frequently Asked Questions About Plastic Manufacturing

Redline Plastics is a leading rotational molding manufacturer, heavy-gauge thermoforming company, and compression molding supplier providing high-quality custom plastic products for industries across the United States. We offer a full range of manufacturing capabilities including industrial sewing services, product design engineering, large-format 3D printing, CNC trimming, assembly, and fulfillment. As a full-service plastic manufacturing partner, we support your project from concept through production with in-house engineering, tooling, and made in USA manufacturing.

Our team specializes in contract manufacturing solutions that deliver exceptional quality, on-time delivery, and cost-effective results. Whether you need a single prototype or full production volumes, Redline Plastics is your trusted partner for custom plastic products and complete turnkey solutions.

MADE IN USA

Manufacturing

ISO 9001:2015

Certified

End-to-End

Solutions

On-Time

Delivery

Quality You

Can Count On