plastics 1
DESCRIPTION
PlasticsTRANSCRIPT
![Page 1: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/1.jpg)
Designing of PlasticsDesigning of Plastics
![Page 2: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/2.jpg)
Materials
Plastics (Polymers)
Thermosets Thermoplastics
Polymer Families
![Page 3: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/3.jpg)
ThermoplasticsPlastics capable of softening and flowingwhen heated, hardening when cooled, and softening when reheated
ThermosetsPlastics which become permanently rigidwhen heated, chemically reacted or irradiated
Polymer Families
![Page 4: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/4.jpg)
ADVANTAGES:•Recyclability•Faster Processing Time•Toughness•Assembly Options
ADVANTAGES: •High Temperature •Arc Resistance•Mechanical Rigidity•Creep Resistance•Chemical Resistance
DISADVANTAGES:•Creep•Thermal Stability•Chemical Resistance
DISADVANTAGES:•Brittle•Limited Post-Mold Assembly Options•Not Recyclable
Thermoplastics ThermosetsExamples:•Refrigeration Foam•BMC for handles•Some Coatings (Paint)•Crosslinked PE Tubing
Examples:•Refrigerator Liner•“Tails” for handles•Some Coatings (Paint)•PE Tubing
Polymers Thermoplastic vs. Thermoset
![Page 5: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/5.jpg)
Plastic is not as stiff as metal
![Page 6: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/6.jpg)
1040 Steel 30x106
Aluminum 10x106
Amorphous Polymer @ 0.3x106
Glass Reinforced Polymer @ 1.4x106
( psi )
Modulus of Elasticity Comparison
![Page 7: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/7.jpg)
Polycarbonate (PC)Polybutylene terephthalate(PBT)Modified polyphenylene ether(M-PPE)Polytherimide(PEI)PC-PBT blend
Annealed Steel20
15
10
5
0
25
30
35
40
0 1 2 3 4 5 6
Mostly Linear to Yield Point
Non-linear
Non-Linear MaterialBehavior
“Stiffness Changes”
![Page 8: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/8.jpg)
Product Information LEXAN 141
Non-halogenated, 10.5 MFR
Typical Properties Typical Value Units
MechanicalTensile StrengthTensile StrainTensile ModulusImpact Strength
ThermalHDTVicat Softening Temp.RTI
ElectricalVol Res
Everything you need to know…Everything you need to know…is is NOTNOT on the Datasheet on the Datasheet
What do you useas a material stresslimit in design?
Not on the Data Sheet
![Page 9: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/9.jpg)
Product Information LEXAN 141
Non-halogenated, 10.5 MFR
Typical Properties Typical Value Units
MechanicalTensile StrengthTensile StrainTensile ModulusImpact Strength
ThermalHDTVicat Softening Temp.RTI
ElectricalVol Res
Everything you need to know…Everything you need to know…is is NOTNOT on the Datasheet on the Datasheet
Allowable Working Stress (Design Stress)
![Page 10: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/10.jpg)
Allowable Working Stress
>Intermittent LoadTensile Fatique Curve - Click
>Steady LoadCreep Domain Curve
>Momentary Load70% of 0.2% strain offset
![Page 11: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/11.jpg)
ULTEM 1000
Data sheet Tensile Strength = 15,200 PSIAllowable Working Stress
Steady load, 730 F = 3,800 PSIIntermittent Load, 730 F = 6,300 PSIMomentary Load, 730 F = 8,400 PSI
![Page 12: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/12.jpg)
Selection Criteria
• Define criteria – Necessary
– Desirable
• Cost
• Strength / Toughness
• Dimensional stability
• Operating Temperature
• Chemical Environment
• Flammability
• Production Method
• Shrinkage
• Assembly Techniques
• Aesthetics
• Post Processing
• Rank criteria– Definite value
– Weighted opinion
• Typical Criteria
![Page 13: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/13.jpg)
Material Selection WorksheetPart #…………………. EST Implementation Date………………………..Function…………………. REQUIREMENTS
Loading Stress…………………. Safety Factor……………… Max Temperature…………………. Impact: High Medium Low @……°C Load Type Tensile# Flexural# Shear# Compressive# Dimensional Stability: <……..% Distortion Tolerance @………. , °C…….. Rel Humidity……
STRUCTURAL
ENVIRONMENTAL Chemical exposure……… (Incidental)…………………… (Continuous)……………………. Weatherability……… (Outdoor)…………………… (Indoor)……………………. Duration………. Hrs AGENCY Flammability: V-0 V-1 V-2 5V HB @………mil
UL Temperature Rating: Others:
APPEARANCE Painted: Molded in Color: Special Surface Requirements:
ASSEMBLY Will the part need to be disassembled? Frequently…. Occasionally……. Never……..
How: Heat Staking Ultrasonic Welding Screws Adhesives Snap Fits
![Page 14: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/14.jpg)
Plastic is melted then pushed into a mold
![Page 15: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/15.jpg)
Plastic Flow is:
• NON - NEWTONIANNON - NEWTONIAN
• ALL FLOW IS RADIALALL FLOW IS RADIAL
• COMPRESSIBLECOMPRESSIBLE
![Page 16: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/16.jpg)
Injection FlowInjection Flow
![Page 17: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/17.jpg)
Injection FlowInjection Flow
![Page 18: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/18.jpg)
Injection FlowInjection Flow
![Page 19: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/19.jpg)
Injection FlowInjection Flow
![Page 20: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/20.jpg)
Injection FlowInjection Flow
![Page 21: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/21.jpg)
Plastic Flow :
Plastic will only flow so far
What is Freeze-off?
Solid
Melt
Freeze-off
Cooled Part
![Page 22: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/22.jpg)
Plastic Flow :
Does not like to change direction
Uniform wall thickness promotes better flow
![Page 23: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/23.jpg)
Uniform Wall Thickness
Minimizes:
• Molded-in Stress
• Warpage
• Voids
• Sink Marks
Sink Marks VoidsLow mold in stress
High mold in stress
Warpage
Improved Design
Poor Design
![Page 24: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/24.jpg)
Efficient Wall Design
Minimum Wall Thickness Increases Productivity:• Reduce Cycle Time• Reduce Material Consumption
Limits to Minimum Wall Thickness:• Flow Length - Click• Structural Stiffness & Strength• Flammability Rating• Uniform Thickness
![Page 25: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/25.jpg)
Flow Length Requirements on a Material can be Reduced by Adding Gates
Increasing the Number of Gates Increase the Number of Knitlines
For Best Aesthetics: Use Higher Flow Material with a Single Gate
Reduced Flow Length vs. Knitlines
Gate selection will impact ease of processing as well as aesthetics.
Click
![Page 26: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/26.jpg)
Plastic Flow :
will flow around holes and cut-outsto form weld lines
Flow Direction
![Page 27: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/27.jpg)
Flammability Limitations
UL Flammability Requirements:If a flammability rating is required for an application, the resin’s minimum thickness to pass the flammability test isthe part’s minimum wall thickness.
Example:A NORYL® resin has a UL 94 V-0 rating at .060”.An application requiring a V-0 rating will requirea .060” minimum wall thickness.
![Page 28: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/28.jpg)
Recommended Wall Thickness
![Page 29: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/29.jpg)
Non uniform thickness builds stresses near the boundary of the thin section to thick section.
The thin section does not yield because it is freeze-off, the thick section (which is still liquid) must yield. Often this leads to warping or twisting. If this is severe enough, the part could even crack.
Why Warpage?
![Page 30: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/30.jpg)
Factors Affecting Warp:
(Uneven Shrinkage Causes Warp)
• Uneven Wall Thickness
• Unequal Cooling Rate
• Unequal Pressure
• Anisotropy
Warpage
![Page 31: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/31.jpg)
h
h
h
3h
Poor
Good
Best
What if you cannot have uniform walls, (due to design limitations) ?
Wall Thickness
When uniform walls are not possible, then the change in section should be as gradual as possible
![Page 32: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/32.jpg)
Warpage Due to Uneven Thickness
Alternatives
![Page 33: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/33.jpg)
Molded in stress can reduce the load bearing capability of my part
![Page 34: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/34.jpg)
Molded-in Stress
Mold-in
Mold-in
Assembly
Assembly
Application
Application
LowMolded-in
Stress
HighMolded-in
Stress
HighPerformance
LowPerformance
![Page 35: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/35.jpg)
Molded-in Stress
•Overpacking
•Uneven Shrinkage
Causes:
![Page 36: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/36.jpg)
Overpacking
•More Material than Required in the Mold Cavity•Results in Molded in Stresses
![Page 37: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/37.jpg)
Shrinkage
• Decreased spacing between polymer chains at cooler temperatures
• Must be accommodated in tooling design
![Page 38: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/38.jpg)
I can’t define tolerances the sameway as with metal
![Page 39: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/39.jpg)
Moldability
ShrinkagePost-Mold Dimensions of Plastic Parts Differ From Mold
Cavity Dimensions
VpartVmold
lpart
lmold
Sl = lmold - lpart
lmold
Sv = vmold - vpart
vmold
or
![Page 40: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/40.jpg)
Moldability
Factors Affecting Shrinkage:
•Material Properties
•Part Geometry
•Manufacturing
![Page 41: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/41.jpg)
Material Considerations
Some materials shrink differently than othersand require different part & tool
design considerations
Crystalline Amorphous Filled Amorphous
- - -Part
![Page 42: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/42.jpg)
Shrinkage and Materials
Amorphous Typical ShrinkageLEXAN® (PC) 5-7 mm/mNORYL® (PPO)CYCOLAC® (ABS)
Semi-crystallineVALOX® (PET/PBT) 5-25
BlendsXENOY® (PBT/PC) 5-10NORYL® GTX (PPO/Nylon)CYCOLOY® (PC/ABS)
![Page 43: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/43.jpg)
Shrinkage and Part Geometry(Stress Due to Uneven Shrinkage)
Non-Uniform Part Thickness Cools UnevenlyCausing High Molded-in Stress
![Page 44: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/44.jpg)
Uneven Shrinkage Defects
VoidsAlready Cooled Surface
Will Not Yield to ShrinkingInterior
Sink MarksSurface Yields to the
Still Shrinking Interior Mass
Click
![Page 45: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/45.jpg)
Reinforcements are better than thicker walls
![Page 46: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/46.jpg)
Reinforcement Structures
GussetRibbing
Boss
![Page 47: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/47.jpg)
Rigidity Balance
E1X I1 = E2X I2
Two parts with equivalent RIGIDITY
I bh3
= Modulus of Elasticity
= Moment ofInertia
(E) (I)
![Page 48: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/48.jpg)
Equivalent Rigidity12” x 24” Plate
Thickness (in.) 0.040 0.182 0.196 0.125
E (psi) 3.0 x 107 3.2 x 105 2.58 x 105 3.20 x 105
I (in.4) 0.000064 0.006 0.0075 0.006
Exl (Rigidity) 1920 1920 1920 1920
Solid Structural Ribbed*Plastic Foam SolidSteel
2” .270”.065”
![Page 49: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/49.jpg)
Equivalent Rigidity12” x 24” Plate
Solid Structural Ribbed*Plastic Foam SolidSteel
Thickness (in.) 0.040 0.182 0.196 0.125
E (psi) 3.0 x 107 3.2 x 105 2.58 x 105 3.20 x 105
I (in.4) 0.000064 0.006 0.0075 0.006
Exl (Rigidity) 1920 1920 1920 1920
Weight (lbs) 3.24 1.88 1.78 1.601.60
![Page 50: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/50.jpg)
Rib Thickness
In structural parts where sink marks are of no concern, rib base thickness can be 85% of the wall thickness
For High appearance parts, where sink marks are objectionable, rib base thickness should not exceed
- 50% of the wall thickness if the outside surface is textured - 30% if not textured
Ribs which are too thick:•Cause sink marks•cause voids•increase cycle timet
60% t
Suggested Rib Thickness: 60% of Nominal Wall Thickness
Click
![Page 51: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/51.jpg)
Limited By:• Thickness - Shrink and
Warp Issue• Draft - Ejection Issue
Rib Height
Suggested Height = 3 to 5t
tOriginal Design - Too High
= 2x‘t’ min.
Avoid hot blade and cooling
![Page 52: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/52.jpg)
Stiffener Orientation
No Increase in Stiffness
Increased Stiffness
![Page 53: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/53.jpg)
Boss Design
D
2D
W
T
R = .25 T
Strong Possibility of Sink MarksWhen W > .6 T
H = 2 to 5T
![Page 54: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/54.jpg)
Gussets
Gussets are often placed at points of attachment, support, or contact with other components.
Effective in reducing localized regions of large deflection and in
distributing stress.
![Page 55: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/55.jpg)
Plastic Flow :
Does not like to change direction
Rounded corners promote better melt flow
![Page 56: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/56.jpg)
Radii, Fillets and Corners
Larger fillet radius
•Avoids stress concentration
•Provide streamlined flow paths for the molten plastic resulting in easier fills.
The stress concentration factor is a multiplier factor, it increases the stress.
Actual Stress = Stress Concentration Factor K x Stress Calculated
The stress concentration factor is very high if r/t values are less.
![Page 57: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/57.jpg)
![Page 58: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/58.jpg)
Radii, Fillets and Corners
A fillet radius(r) should be between 25% to 60% the nominal wall thickness or a minimum radius of 0.02 inch (0.5mm) is suggested.
The larger fillet radius suggested for load carrying features.
Break any sharp corner with at least 0.005 inch (0.13mm) radius.
![Page 59: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/59.jpg)
The part must be able to be ejectedfrom the mold
![Page 60: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/60.jpg)
No Draft Angle
Difficult Ejection Easier Ejection
Ejecting the Part
Generous draft angles will facilitate part ejection.
The amount of draft angle depends on the depth of the part in the mold, and its required end use function
Click
![Page 61: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/61.jpg)
Generous Draft Angle > 1oDraft is the tapering of surfaces parallel to the line of draw (opening and
closing of the mold) for easier part removal.
The larger the draft angle, the easier the ejection.
For a Textured Sidewall
Additional 1 Degree Per 0.001 inchesin Depth of Texture
Typically draft angle is 10 with 1/20 on ribs
![Page 62: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/62.jpg)
• Where minimum draft is desired due to design limitations, good polishing recommended and depth should not exceed 0.5 in.
• More draft aids ejection but may generate a material mass on sections contained in one side of the mold.
• The mold parting line can be relocated to split the draft in order to minimize it.
Draft leads material mass Without draft P/L relocation
![Page 63: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/63.jpg)
• Parting line consideration depends upon shape and the function of the part. Specify the mismatch on the parting line to meet the required function.
Parting line
![Page 64: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/64.jpg)
• Drag at shutoff will wear over time and develop flash. When a stepped parting line required allow 70 draft for shutoff . Minimum shutoff angle is 50.
Shutoff / stepped parting line
![Page 65: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/65.jpg)
Direction of Pull
How do you stiffen the 2nd Side?(Using ribs in red?)
Mold
Mold
Part
Direction of Pull
How to Stiffen Areas Not Parallel to the Parting Plane of the Tool:•Thicken the wall and do not use ribs•Use ribs created with slides and cams in the tool (Costly)
•Often best molded as two separate ribbed parts and then assembled
Click
Click
Click
![Page 66: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/66.jpg)
REQUIRES SLIDE IN MOLD
NO SLIDE REQUIRED
NO SLIDE REQUIRED,MOLD LESS COMPLEX
Click
![Page 67: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/67.jpg)
Plastic Notes PDI 4.23
Material: Noryl PX1600-701 per A50LA77B. 50% regrind allowed. Wall thickness to be .060 .010 unless otherwise specified. Color White per 12H2427. Draft to be 1 max unless otherwise specified. Ejector pins, gates, and parting line locations must be approved by GEA design engineering in writing prior to initial tooling, retooling or tooling modifications. Flash not to exceed .005 height x .003 thickness. Mismatch of surface across parting line not to exceed .005. Dimensions do not include flash. All fillets, radii and edges to be .020 R .005 . GEA part number, cavity number, and proper recycling identifier (refer to PDI 5.21) must be legible And located on surface indicated.
![Page 68: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/68.jpg)
Plastic Notes –PDI 4.23
This component (assembly) is referenced in international regulatory agency approvals. Suppliers, materials, part marking and dimensions must not be changed without prior approval of program manager international standards or designee.
Materials must be UL recognized, CSA approved (or cUL recognized). Appearance surface must have a gloss of 60 min. per test specification E9F2B. Visible surfaces to be free of sink marks and flash. Material must meet test per QCI 211112 Pt 3(heat distortion). no visible distortion. Material must meet odor and taste test per TS E8C76A SECT. ?? , less than grade 2. Max bow specification to be .010 . Max longitudinal twist specification to be 1
![Page 69: Plastics 1](https://reader033.vdocument.in/reader033/viewer/2022061404/55cf9a09550346d033a031da/html5/thumbnails/69.jpg)
Thank you for your attention