SEMCO® Precision Molded Plungers | Zero-Waste Dispensing Solutions

Why Choose SEMCO® Plungers?

SEMCO® precision molded plungers deliver superior performance through:

• Perfect Cartridge Fit: Contoured design matches cartridge interior precisely
• Complete Dispensing: Ensures material utilization with zero waste
• Dual Density Options: High-density and low-density configurations for different materials
• Three Functional Styles: Molded, wiper, and pressure relief designs
• Cost Savings: Eliminates material waste and reduces disposal costs
• Professional Quality: Consistent performance across all applications

Understanding Plunger Density Options

High-Density (HD) Plungers

Engineered for demanding applications and viscous materials:

• Superior Rigidity: Maintains shape under high pressure
• Enhanced Durability: Resists deformation during dispensing
• Consistent Performance: Reliable with thick sealants and adhesives
• Ideal For: High-viscosity materials, structural adhesives, heavy-duty sealants
• Color: White (wiper style)

Low-Density (LD) Plungers

Flexible construction for versatile applications:

• Greater Flexibility: Adapts to cartridge variations
• Smooth Operation: Easier movement through cartridge
• Gentle Pressure: Reduced force required for dispensing
• Ideal For: Standard sealants, medium-viscosity materials, general applications
• Colors: White (wiper), Black (molded)

Three Specialized Plunger Styles

1. Precision Molded Plungers

Standard design for general dispensing applications:

• Basic Construction: Simple, effective design
• Cost-Effective: Economical solution for standard applications
• Reliable Performance: Consistent material flow
• Available In: Low-density (black color)
• Best For: General-purpose dispensing, standard materials

2. Wiper Plungers

Advanced design featuring superior wiping action:

• Enhanced Wiping Edge: Specialized lip design
• Maximum Material Recovery: Scrapes cartridge walls clean
• Zero Waste: Ensures complete material dispensing
• Contoured Design: Perfectly matches cartridge interior
• Available In: High-density and low-density (white color)
• Best For: Expensive materials, maximum efficiency, cost-sensitive applications

3. Pressure Relief Plungers

Specialized design for pressure-sensitive applications:

• Built-In Pressure Relief: Prevents over-pressurization
• Safety Feature: Protects cartridge integrity
• Controlled Dispensing: Prevents material surge
• Specialized Applications: Temperature-sensitive materials
• Available In: Low-density (white color)
• Best For: Materials that expand, temperature variations, safety-critical applications

Complete Size Range

Our plunger collection covers all SEMCO® cartridge capacities:

Standard Cartridge Plungers (1oz - 12oz)

1.0oz Cartridge Plungers

• Precision fit for smallest cartridge size
• Perfect for specialty materials
• Minimal waste on expensive products
• Available in wiper style (LD)

2.5oz, 6.0oz, 8.0oz, 12.0oz Cartridge Plungers

• Universal fit for most common sizes
• Available in all three styles
• High-density and low-density options
• White (wiper/pressure relief) and black (molded) colors

Large Capacity Plungers

20oz / 32oz Cartridge Plungers

• Engineered for high-volume cartridges
• Enhanced structural integrity
• Maximum material recovery
• Available in HD and LD wiper styles
• Critical for cost savings on large volumes

1/10 Gallon Cartridge Plungers

• Designed for maximum-capacity cartridges
• Industrial-grade construction
• Complete material dispensing
• Available in LD wiper style
• Essential for production environments

Key Features & Benefits

Precision-Molded Construction

• Exact dimensional tolerances
• Consistent performance batch-to-batch
• Quality-controlled manufacturing
• Engineered to aerospace standards

Cartridge-Contoured Design

• Matches internal cartridge profile perfectly
• Eliminates air pockets and gaps
• Ensures uniform pressure distribution
• Maximizes material recovery

Complete Material Utilization

• Dispensing efficiency
• Eliminates costly material waste
• Reduces disposal requirements
• Maximizes ROI on expensive materials

Versatile Compatibility

• Works with SEMCO® cartridges
• Compatible with manual and pneumatic tools
• Suitable for single and plural-component materials
• Universal application across industries

Cost-Effective Performance

• Affordable per-unit pricing
• Significant savings through waste elimination
• Extended material life
• Reduced environmental impact

Applications

SEMCO® plungers are essential for:

Aerospace Applications:

• Fuel tank sealant dispensing
• Structural adhesive application
• Windshield bonding materials
• Pressurization sealants
• Fillet sealants
• Fastener hole sealing

Material Types:

• Polysulfide Sealants: Fuel tank sealants, pressurization sealants
• Polyurethane Sealants: Fillet sealants, general-purpose sealants
• Epoxy Adhesives: Structural bonding, component assembly
• Silicone Sealants: Environmental sealing, gasketing
• Specialty Materials: Primers, coatings, potting compounds

Industry Sectors:

• Aerospace manufacturing and MRO
• Industrial assembly operations
• Automotive applications
• Marine construction
• Electronics manufacturing
• General industrial

Selecting the Right Plunger

Consider These Factors:

1. Cartridge Size: Match plunger to exact cartridge capacity
2. Material Viscosity: High-viscosity = HD; Standard = LD
3. Cost of Material: Expensive materials benefit from wiper style
4. Application Type: Pressure-sensitive materials may need pressure relief
5. Dispensing Tool: Verify compatibility with manual or pneumatic systems
6. Volume Requirements: Large-volume operations maximize wiper benefits

Quick Selection Guide:

Complete System Compatibility

SEMCO® plungers integrate seamlessly with:

Cartridges:

• All SEMCO® disposable cartridges (1oz to 1/10 gallon)
• High-density and low-density cartridges
• Standard and custom configurations

Dispensing Tools:

• Manual dispensing guns (Models 850, 870, 890)
• Pneumatic guns (Models 250-A, 250-B)
• Battery-powered tools
• Bench-top dispensers

Accessories:

• Flange caps (for cartridge sealing)
• Seal caps (for nozzle end)
• Retainers (for plunger retention)
• Complete SEMCO® system

Installation & Best Practices

Proper Installation:

1. Insert plunger into cartridge open end
2. Ensure plunger is seated squarely
3. Push plunger down to contact material
4. Install flange cap to secure plunger
5. Remove seal cap from dispensing end before use

During Dispensing:

• Apply consistent, steady pressure
• Monitor plunger advancement
• Continue until material stops flowing
• Wiper plungers will clean cartridge walls completely

Maximizing Efficiency:

• Use wiper plungers for expensive materials
• Replace plungers when switching materials
• Store cartridges with plungers installed
• Maintain proper pressure to avoid air entrapment

Safety Considerations:

• Use pressure relief plungers when appropriate
• Don't exceed recommended pressure ratings
• Inspect plungers for damage before use
• Follow material safety data sheets (MSDS)

Quality Assurance

Every SEMCO® plunger meets stringent standards:

• Precision-molded to exact specifications
• Consistent dimensional tolerances
• Material compatibility verified
• Quality-controlled manufacturing
• Compatible with aerospace specifications

Maximize your material investment. Choose SEMCO® precision molded plungers to ensure complete dispensing, eliminate waste, and reduce costs.