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Solutions To Today's Engineering Problems - Part 2

Parts machined from engineering plastics can replace steel, malleable iron, aluminum, brass, stainless steel, rubber and urethane in plant process equipment.

Ensinger offers a wide selection of engineering plastics in rod and slab shapes. Parts machined from these plastics can replace steel, malleable iron, aluminum, brass, stainless steel, rubber and urethane in machinery and plant process equipment.

Compared with the materials they replace, these parts can offer:

  • Noise reduction
  • Low / no maintenance
  • No process contamination -- no lubrication required
  • Increased process equipment reliability
  • Increased plan productivity -- lighter parts can be moved more rapidly
  • Cost savings -- low machining costs and short lead time

Machining plastic is a good choice for:

  • Large or thick section parts that can be molded
  • Intricate or close-tolerance parts
  • Small quantity applications
  • Prototype parts to test a design concept
  • Short lead time

Manufacturers are using engineering polymers today, instead of metal, to gain important competitive advantages. Selecting the best material for a specific use from Ensinger's full line of engineering polymers isn't difficult. All you need is some general information about operating conditions, such as temperature extremes, and impact loading. With these facts in hand, you can match your intended use with the drawing below and determine which of Ensinger's materials is most likely to give you the best performance. Your local Laird Plastics representatives are always ready to provide additional recommendations and engineering data as needed.

Ensinger Engineering Plastics
8. Application: Timing Screw
Material Replaced: Metal
Material used: TECAMID™ 6/6 Nylon
Benefits:
  • Low noise, low friction, light weight, less product damage due to resiliency of plastic as compared to metal
Needs: tensile properties, durability, wear resistance
9. Application: Conveyor Supports / Tooling Locators
Material Replaced: Steel, Aluminum, Urethane
Material Used: TECAMID&trade 6/6 Nylon
Benefits:
  • Low noise
  • Cost savings -- non-damaging carrier for products
  • Cost savings -- lower cost than urethane and faster turnaround time of machining plastic as compared to molded urethane
Needs: Good lubricity, low abrasive wear, tensile strength
10. Application: Can Transfer Mandrel
Material Replaced: Steel
Material used: HYDLAR® Z
Benefits:
  • High reliability -- low downtime due to increased wear life
Needs: Excellent wear resistance, good lubricity, good tensile properties, non-abrasive
11. Application: Piston Pump-Food Processing
Material Replaced: FDA Grade Steel
Material Used: HYDEX® 4101
Benefits:
  • Cost savings -- replacing expensive / exotic FDA metals
  • Low maintenance -- long lasting non-corrosive plastic
  • Ease of fabrication of plastic as compared to metal
12. Application: Valve Body-Food Processing
Material Replaced: PET
Material Used: HYDEX® 4101
Benefits:
  • High reliability -- less downtime due to more impact resistant / durable HYDEX® 4101
  • Corrosion resistant, light weight, east of fabrication
Needs: FDA approval, impact durability, dimensional stability
13. Application: Impeller
Material Replaced: Rubber, Urethane, Metal
Material Used: HYTREL® Thermoplastic Polyester
Benefits:
  • Less maintenance versus metal because of the non-corrosive nature of plastic
  • Cost savings -- lower cost than urethane and faster turnaround time of machining plastic as compared to molded urethane
Needs: FDA approval, resilience, sealing properties, strength
14. Application: Sprocket Drives / Flex Couplings
Material Replaced: Steel, Rubber
Material Used: TECAMID™ ST801, DELRIN® HYTREL® Nylon
Benefits:
  • Low noise
  • Corrosion resistance -- longer lasting
Needs: Varying stiffness requirement, good lubricity, wear resistance
15. Application: Robotic Gripper Hand
Material Replaced: Steel, Aluminum, Urethane
Material Used: HYTREL® Thermoplastic Polyester
Benefits:
  • Cost savings -- less product damage due to "soft touch" gripper hand
  • Cost savings -- ease of machining HYTREL® as compared to expensive urethane molding process
Needs: High friction for good grip, flex strength, low modulus soft touch

PRODUCT PROFILES

TECAMID™ Nylon

The industrial standard for machined plastic. High strength and toughness combined with high temperature properties and excellent resistance to grease, oil and solvents.

Primary Applications:

  • Gears
  • Seals
  • Wear plates
  • Timing screws
  • Washers
  • Bushings
  • Bearings

Grades Available:

  • Tecamid™ 6/6 -- standard grade
  • Tecamid™ 6/12 -- low moisture absorption
  • Tecamid™ ST801
  • Tecamid™ 6/6 MDS -- low surface friction, enhanced lubricity

Chemical Resistance

  • Aliphatic, Aromatic Hydrocarbons -- excellent (fuels, oils, solvents)
  • Organic compounds -- excellent (ketones, esters, aldehydes)
  • Partially halogenated hydrocarbons -- good to poor (methylene chloride, chloroform)

Physical Properties:
Service Temperature 250°F

Coefficient of friction:

  • Tecamid™ 6/6 on Tecamid&trade 6/6 -- Static-0.36, Dynamic-0.11
  • Tecamid™ 6/6 on steel -- Static-0.31, Dynamic-0.17

Other Physical Properties:

  • High wear resistance
  • High tensile strength
  • FDA approved grades

HYDEX® 4101

A PBT polyester with excellent chemical resistance that makes it a popular product in harsh environments. Its FDA approval makes it a good choice for the food processing industry. It is widely used in electronics because it has excellent electrical properties.

Primary Applications:

  • Valves
  • Pump parts
  • Impellers
  • Fuel pumps
  • Bus bars
  • Connectors
  • Relays
  • Bobbins
  • Gears

Grades Available:

  • FDA-white
  • Non-FDA-black

Chemical Resistance

  • Aliphatic Hydrocarbons -- excellent (gasoline, oils, alcohols, dilute acids and bases)
  • Organic solvents -- excellent to fair (good resistance to ethyl and isopropyl alcohol, moderate resistance to methyl alcohol)

Physical Properties:
Service Temperature 248°F

Coefficient of friction:

  • HYDEX® 4101 on HYDEX® 4101 -- Static-0.14, Dynamic-0.15
  • HYDEX® 4101 on steel -- Static-0.17, Dynamic-0.19

Other Physical Properties:

  • Good dimensional stability
  • Low moisture absorption
  • Excellent fatigue endurance

HYDLAR® Z

A blend of Nylon reinforced with aramid fibers. The aramid filler enhances the physical properties but is not abrasive like glass fibers. Aramid fibers increase the tensile and flexural strength and also increases the impact and heat properties.

Primary Applications:

  • Pulleys
  • Bearings (Heavy load)
  • Canning mandrels
  • Casters
  • High strength wheels
  • Rollers
  • Wear plates

Chemical Resistance

  • Same as nylon

Physical Properties:
Service Temperature 275°F

Tensile Properties:

  • Modulus-1.3 million psi
  • Flexural strength-23,000
  • Compressive strength-19,300

Other Physical Properties:

  • Wear factor-128 to 79
  • Galling of mating surfaces-none

HYTREL®

A high strength, flexible plastic with excellent dynamic properties, good high and low temperature properties and resistance to creep.

Primary Applications:

  • Fasteners
  • Springs
  • Shock absorbing devices
  • Seals
  • Bushings
  • Hinges
  • Gears
  • Pump diaphragms

Grades Available:

  • 5556-55 durometer, 30000 modulus
  • 7246-72 durometer, 83000 modulus

Chemical Resistance

  • Non-polar materials -- excellent
  • Polar materials -- poor

Physical Properties:
Service Temperature 250°F

Tensile Properties:

  • Flexural Modulus range - 51000 psi-175000 psi
  • Elongation at break-600%

Other Physical Properties:

  • Resistant to flex cut growth
  • High impact resistance
  • Excellent abrasion resistance

DELRIN® and HYTREL® are registered trademarks of the DuPont Company.
HYDLAR® and HYDEX® are registered trademarks of Ensinger Industries, Inc.