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Alcobra Metals, Inc. : Distributor of Specialty Metals

Plastics Product Guide

 Purchase Plastic HERE!

Plastics are a widely used material for a broad use of applications. Plastic has a huge selection of different types, shapes, and sizes. Plastic materials are organic, synthetic or processed polymers that are supplied as raw materials or stock shapes. They typically consist of thermoplastic or thermosetting resins and can be made into many forms. Stock shape forms include:  sheets, plates, rods, tubes, films, and extruded profiles. Check out our Plastic Information and Cross Reference Chart.

 

ABS

Available in sheet, plate, rod

Acetal (Delrin)

Available in sheet, plate, rod

Acrylic

Available in sheet, plate, rod

HDPE

Available in sheet, plate

Nylon-Natural

Available in sheet, plate, rod

Phenolic

Available in sheet, plate, rod

Plexiglass (see Acrylic)

Available in sheet, plate

Polycarbonate

Available in sheet, plate, rod

 PVC-Gray

Available in sheet, plate, rod

Seaboard

Available in sheet, plate

Teflon

Available in sheet, plate, rod

UHMW-Natural

Available in sheet, plate, rod

 

ABS

ABS has perhaps the best balance of properties when cost is a factor. It has good chemical and stress-resistance as well as a combination of toughness with rigidity and creep resistance.

 

Hardness, Rockwell R

103-112

Tensile Strength Yield (psi)

6160-6500

Melt Flow

18-23 g/10min

Max Service Temperature (Max in air)

190-192

Flammability, UL94

HB

 

Acetal (Delrin)


Acetal provides high strength and stiffness coupled with enhanced dimensional stability and ease of machining. As a semi–crystalline material, acetal is also characterized by a low coefficient of friction and good wear properties–especially in wet environments. Because acetal absorbs minimal amounts of moisture, its physical properties remain constant in a variety of environments. Low moisture absorption results in excellent dimensional stability for close–tolerance machined parts.

In high moisture or submerged applications, acetal bearings outperform nylon 4 to 1. Acetal is ideally suited for close tolerance mechanical parts and electrical insulators which require strength and stiffness. It also offers resistance to a wide range of chemicals including many solvents.

Delrin, a homopolymer acetal, is also manufactured and stocked in rod and plate. It offers slightly higher mechanical properties than Acetron® GP Acetal, but may contain a low–density center, especially in larger cross–sections. Copolymer acetal also offers better chemical resistance than homopolymer acetal.

Color

Natural and Black

Durometer Hardness, Shore D

85

Tensile Strength

9,500 psi

Water Absorption 24 hrs

0.20%

Tensile Elongation at break

30%

Shear Strength

8,000 psi

Specific Gravity

1.41

Continuous Service Temperature (Max in air)

180° F

Dielectric Strength

420 v/mil

 

PLEXIGLASS

Plexiglass sheet is a common reference term for acrylic sheets. When spelled as Plexiglas® (one S) it refers to the Arkema brand name. When spelled as plexiglass (two SS's), the user is not being brand specific and is considered to be looking for a generic acrylic sheet.

 

Acrylic

Acrylic plastic refers to a family of synthetic, or man-made, plastic materials containing one or more derivatives of acrylic acid. The most common acrylic plastic is polymethyl methacrylate (PMMA), which is sold under the brand names of Plexiglas, Lucite, Perspex, and Crystallite. PMMA is a tough, highly transparent material with excellent resistance to ultraviolet radiation and weathering. It can be colored, molded, cut, drilled, and formed. These properties make it ideal for many applications including airplane windshields, skylights, automobile taillights, and outdoor signs. One notable application is the ceiling of the Houston Astrodome which is composed of hundreds of double-insulating panels of PMMA acrylic plastic. 

Color

Transparent

Rockwell Hardness

M-93

Tensile Strength

10,000 psi

Water Absorption 24 hrs. @ 73°F

0.2%

Compressive Strength (yield)

17,000 psi

Specific Gravity

1.19

Maximum Continuous Service Temperature

160° F (71° C)

Dielectric Strength

430 v/mil

Forming Temperature

300°F

Refractive Index

1.49

Light Transmission, Total

92%

 

HDPE

HDPE (high-density polyethylene) offers excellent impact resistance, light weight, low moisture absorption, and high tensile strength. HDPE is also non-toxic and non-staining and meets FDA and USDA certification for food processing.

·  Available As Extruded or Stress Relieved (S/R)

Color

 

Rockwell Hardness & Brinell @ 73°F

D69

Tensile Strength @ 73°F

4600

Water Absorption 24 hrs.

0.03

Compressive Strength (10% Deformation)

3100

Shear Strength @ 73°F

3380

Maximum Continuous Service Temp-in air (max)

180

Maximum Continuous Service Temp-in air (min)

-78

Approximate Melting Temperature °F

260

 

Nylon-Natural

This is superior engineering material for many diverse applications, the primary use as a bearing material, without lubrication, (under low PV limits) up to the point where a self-lubricating or superior wear material becomes necessary. It has replaced bronze, brass, steel, aluminum, and others. High impact resistance and not subject to embrittlement or deterioration. High heat distortion temp, excellent vibration resistance. Intermittent 330 deg F, continuous to 230°F.   

Typical Physical Properties

 

Color

 

Tensile Strength

12-400

Water Absorption (24 hrs)

1.2

Compressive Strength (yield)

12,000

Specific Gravity

 

Maximum Continuous Service Temperature

-40 to 212

Dielectric Strength

400

 

 

 

 

 

PVC-Gray

  PVC  has excellent corrosion resistance and weather resistance. The working temp is 33 deg F to 160 deg F. and the forming temperatures of 245 deg F. It is good electrical and thermal insulator and has a self-extinguishing per UL Test 94. PVC applications are almost unlimited. It's the most widely used member of the vinyl family. It is excellent when used for corrosion-resistant tanks, ducts, fume hoods, and pipe. Ideal for self-supporting tanks, fabricated parts, tank linings, and spacers. It is not UV stabilized

Typical Physical Properties

 

Color

Various

Tensile Strength

7,000

Water Absorption (24 hrs)

.05

Compressive Strength (yield)

10,830

Specific Gravity

 

Maximum Continuous Service Temperature

 

Dielectric Strength

552

Forming Temperature

 

 

 

 

 

 

 

UHMW


UHMW-PE is ultra high molecular weight polyethylene. UHMW is lightweight and longwearing, providing excellent performance in packaging equipment. Key benefits of UHMW include abrasion and impact resistance. Additional features include: low coefficient of friction, chemically inert, self-lubricating, FDA/USDA approved, and machinable. UHMW lessens the noise of bottles, cans, and conveyor chains. Packaging lines with UHMW components run quietly.

The low coefficient of friction allows it to release food particles and other substances preventing build-ups and bottle-necking. UHMW causes no undesirable taste, smell, or discoloration. This material requires no special care and can be cleaned with water, steam, detergents, or disinfectants.

           

Typical Physical Properties

 

Color

White (Virgin) or Green/Black Marbled (reprocessed)

Rockwell Hardness

R64

Tensile Strength

4,750 psi

Elongation at break

325%

Shear Strength

3,500 psi

Density

.034 lbs/cubic inch

Water Absorption (24 Hours)

<0.01%

Continuous Service Temperature (Max in air)

160° F

 

PHENOLIC Grade L.E. (Linen Electric)

Phenolics, hard and dense plastics are produced using heat and pressure applied to layers. Phenolic Grade LE provides good mechanical & electrical strength. LE has a low moisture pickup and dissipation factor and is great in ALL electrical properties. Recommended for intricate high strength parts. Has a continuous operating temperature @ 250°F.

           

Typical Physical Properties

 

Color

 

Hardness, Rockwell M

M100

Tensile Strength (lengthwise/crosswise)

13,000/9,000

Compressive Strength (psi)

37,000

Max Operation Temp °F

285

Water Absorption 24 Hours (%)

1.8

Continuous Service Temperature (Max in air)

 

 

POLYCARBONATE Machine Grade

Machine-grade polycarbonate has a high-impact strength and a continuous temperature use of 250°F. Its strength, impact resistance and transparency also make it an ideal material for certain transparent structural applications such as sight glasses and windows. This material is a good choice for electrical applications, because of its high elasticity and good dimensional stability.

 

Typical Physical Properties

 

Color

 

Hardness, Rockwell M

75

Tensile Strength (psi)

10,500

Compressive Strength (psi)

11,500

Flammability, UL94

1 (HB)

Water Absorption 24 Hours (%)

.2

Continuous Service Temperature (Max in air)

250

 

SEABOARD® HDPE for Boating

HDPE Seaboard® marine sheet is a high density polyethylene sheet formulated to meet the specific requirements of marine and other outdoor environments.  Special post-production treatment enhances its ability to withstand the effects of salt water, moisture and direct sunlight.

Features and Benefits:

·  High degree of stability

·  Inertness to marine environments

·  Good flexibility and toughness

·  Good dielectric properties

 

TEFLON®  (PTFE Virgin grade)

Teflon Rods & Teflon Sheets (Virgin Grade) have astonishing chemical resistance and ultra high-purity. Self-lubricating and with a low friction coefficient, Teflon PTFE (polytetrafluoroethylene) sheets and rods work well for the manufacturing of high-temperature seals, insulators and bearings used in semiconductor, aerospace & chemical processing industries.

 

Typical Physical Properties

 

Hardness, Shore D

D50

Melting Temp°F

635

Tensile Strength (psi)

3,900

Compressive Strength (psi)

3,500

Max Operation Temp °F

500

Water Absorption 24 Hours (%)

1.8

Continuous Service Temperature (Max in air)

< .01

 

 

 

Alcobra Metals states that all technical data is for comparison purposes only and is NOT FOR DESIGN. It has been compiled from sources we believe to be accurate but cannot guarantee. Please consult a Engineer