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Shrinkage rate of different plastic materials
Release date: 2023-02-22    Source: Qingdao Root Industrial and Trading Co., Ltd.    Browse: 1019

In our opinion, some material itself have small shrinkage, such as ABS, PC, ABS+PC and AS, these does not matter much, but the new materials or recycled material with large shrinkage like PP, PA, PVC and others will be different.

Following is the shrink of different materials:

PMMA:5/1000     

POM:20/1000

PS:5/1000         

PP:16/1000

PC:5/1000    

ABS:5/1000

HIPS:5/1000  

AS:5/1000

GPPS:5/1000          

PBT:15/1000

PA66:16/1000        

PA6:9/1000

TPR:18/1000        

TPU:18/1000

PE:20/1000       


KVA:20/1000

GP:5/1000        

CA:5/1000

KRATON:20/1000

ACETAL:20/1000

PU:20/1000             

PVC:20/1000

PC+ABS:5/1000         

BDS(K-RESIN0):7/1000

PA66+50%GPT:2/1000     

PA66+30%GPT:3/1000

PA66+15%GPT:8/1000   

PBT+30%GPT:3/1000

PP+20%GPT:5/1000    

PP+30%GPT:3/1000

After several years of practice, the above shrinkage rate is absolutely reliable when the product does not exceed 300mm and the average plastic thickness does not exceed 3MM. If the product size is more than 300mm, the subtotal should be 0.0005. If the product size difference is too large, the X axis, Y axis and Z axis should be calculated separately. Special attention should be paid when the thickness of the product is too thick, too thin (less than 0.5) and the product size is too large.

In addition, different products have different actual shrinkage rates even same materials! The following is a list of shrinkage rates summarized by our senior engineers based on years of practical experience. Let's take a closer look~

ABS (acrylonitrile-butadiene-styrene)

Figure shows the application of ABS in automobiles

Plastic name: ABS

Actual shrinkage: 0.0045

Mold opening product type: printer case, car speaker panel, Samsung remote control bottom cover

Plastic name: ABS

Actual opening shrinkage: 0.0035

Mold opening product type: 500X35X30 DVD surface

Plastic name: ABS

Actual opening shrinkage: 0.005

Type of mold opening products: mobile phone case, mobile phone button, case, medical equipment, Midea water dispenser, electrical box, kitchen supplies, Samsung remote control electric cover, auto parts, car speaker, car MP3 case, flashlight case, vanguard bracket (DVD cover), PDA/GPS holder, measuring instrument accessories.

Plastic name: ABS

Actual opening shrinkage: 0.003

Mold opening product type: key cap

Plastic name: ABS

Actual opening shrinkage: 0.0025

Type of mold opening product: support of VIETTA's sub-machine.

Plastic name: ABS

Actual opening shrinkage: 5/1000

Mold opening product type: electrical enclosure

Plastic name: ABS

Actual opening shrinkage: 0.6%

Mold opening product type: auto parts (export)

Plastic name: ABS

Actual opening shrinkage: 0.015

Mold opening product type: controller box

Plastic name: ABS

Actual opening shrinkage: 0.003

Mold opening product type: shell type (IML process)

Plastic name: ABS

Actual opening shrinkage: 0.0035

Mold opening product type: LCD face frame

PPpolypropylene

Plastic name: PP

Actual opening shrinkage: 0.035

Mold opening product type: 8 "casters

Plastic name: PP

Actual opening shrinkage: 0.015

Mold opening product type: Midea electric kettle

Plastic name: PP

Actual opening shrinkage: 0.016

Mold opening product type: auto parts (reflector), kitchen supplies

Plastic name: PP

Actual opening shrinkage: 0.0155

Mold opening product type: Honda car shell

Plastic name: PP

Actual opening shrinkage: 0.018

Mold opening product type: tray, medical basin

The picture shows PP medical products

Plastic name: PP

Actual opening shrinkage: 0.025

Mold opening product type: Safe Deposit Box

Plastic name: PP

Actual opening shrinkage: 16/1000

Mold opening product type: tableware

Plastic name: PP

Actual opening shrinkage: 0.06

Mold opening product type: cosmetic cap

Plastic name: PP

Actual opening shrinkage: 0.020

Mold opening product type: medical equipment

Plastic name: PP

Actual opening shrinkage: 0.015

Mold opening product type: Yunnan Baiyao Lid

PP+TA (calcium carbonate) 30% - ----------- 1%

PP+GF30 ------------0.5%

Plastic name: PP+30% GF

Actual opening shrinkage: 0.01

Mold opening product type: exhaust grille/Louver

Plastic name: PP

Actual opening shrinkage: 0.02

Mold opening product type: washing machine box

Plastic name: PP

Actual opening shrinkage: 0.011

Mold opening product type: rice cooker middle ring

Plastic name: PP-R 4.2 wall thickness

Actual opening shrinkage: 0.017

Mold opening product type: PPR water pipe

Plastic name: PP-R 10 wall thickness

Actual opening shrinkage: 0.025

Mold opening product type: PPR water pipe

Plastic name: PP+15% GF

Actual opening shrinkage: 0.015

Mold opening product type: headrest inner plate/lumbar inner plate of office chair

PEpolyethylene

Plastic name: H-PE

Actual opening shrinkage: 0.018

Mold opening product type: Midea electric kettle

Plastic name: PE

Actual opening shrinkage: 0.02

Mold opening product type: soft gear

Plastic name: HDPE

Actual opening shrinkage: 1.02

Mold opening product type: export product

Plastic name: HDPE

Actual opening shrinkage: 0.018

Mold opening product type: strong thread cap

PANylon

Plastic name: PA6T, PA9T

Actual opening shrinkage: 3~5/% 0

Mold opening product type: connector

Plastic name: PA66

Actual opening shrinkage: 16 ‰

Mold opening product type: window lock

Plastic name: PA66

Actual opening shrinkage: 0.0079

Mold opening product type: PCB connector plastic parts

Plastic name: PA+30% GF

Actual opening shrinkage: 0.013

Mold opening product type: Zongshen motorcycle parts

Plastic name: PA66+30% GF

Actual opening shrinkage: 0.005

Mold opening product type: leg of office chair

Plastic name: PA+30% GF

Actual opening shrinkage: 0.0035

Mold opening product type: auto parts (reflector)

Plastic name: PA66

Actual opening shrinkage: 0.09

Mold opening product type: fan COVER/ propeller

PA+30%GF

Actual opening shrinkage: 0.007

Internal rack of power plug

PBT+30%GF

Actual opening shrinkage: 0.005

Internal rack of power plug

Plastic name: PA66

Actual opening shrinkage: 0.018

Mold opening product type: lock

Plastic name: PA6

Actual opening shrinkage: 0.020

Mold opening product type: lock rocker arm

Plastic name: PA66+% 15GF

Actual opening shrinkage: 1.009

Mold opening product type: automobile gear handle

Plastic name: PA66+% 30GF

Actual opening shrinkage: 1.005

Mold opening product type: automobile gear housing

Plastic name: PA+30% GF

Actual opening shrinkage: 0.013

Mold opening product type: switch housing

Plastic name: PA66

Actual opening shrinkage: 0.009

Mold opening product type: tie

Plastic name: PA+15% GF

Actual opening shrinkage: 0.01

Mold opening product type: light barrier core

Plastic name: PA+30% GF

Actual opening shrinkage: 0.005

Mold opening product type: 168 wind wheel

Plastic name: PA6512

Actual opening shrinkage: 0.015

Product: holder base

Plastic name: rubber plastic nylon

Actual opening shrinkage: 0.01

Mold opening product type: handle

Plastic name: PA

Actual opening shrinkage: 0.015

Mold opening product type: pull rope 107

Plastic name: PA66

Actual opening shrinkage: 0.010

Mold opening product type: household switch socket base plate

Plastic name: PA66

Actual opening shrinkage: 0.006

Mold opening product type: row protection door

Plastic name: PA66

Mold shrinkage: 0.012

Mold opening product type: gadget

Plastic name: PA6+30% GF

Mold shrinkage: 0.0035

Mold opening product type: switch upper cover

Plastic name: PA66

Actual opening shrinkage: 1.0%

Mold opening product type: connector

Plastic name: PA66GF30%

Actual opening shrinkage: 0.005

Mold opening product type: high-speed fan

Plastic name: PA66+NPG25

Actual opening shrinkage: 0.0045

Type of mold opening product: an accessory of Siemens (square cover type, many ribs on the inner surface)

Plastic name: PA6+35% GF

Actual opening shrinkage: 0.004

Mold opening product type: auto parts (internal functional parts)

PCpolycarbonate

Plastic name: PC

Actual opening shrinkage: 0.005

Type of mold opening products: mobile phone trim, car audio button, mobile phone protective shell, medical equipment

Plastic name: PC

Actual opening shrinkage: 0.0055

Mold opening product type: auto parts

Plastic name: PC

Actual opening shrinkage: 8/1000

Mold opening product type: mobile phone crystal shell

Plastic name: pc

Actual opening shrinkage: 4/1000

Mold opening product type: notebook battery cover (average thickness 0.6)

Plastic name: PC940

Actual opening shrinkage: 8%

Mold opening product type: various plug housing

Plastic name: PC+15% GF+2% SI

Actual opening shrinkage: 0.002

Mold opening product type: printer housing

Plastic name: PC+15% GF+2% SI+10% PTFE

Actual opening shrinkage: 0.0025

Mold opening product type: printer housing

Plastic name: PC

Actual opening shrinkage: 0.004

Mold opening product type: mobile phone case

Plastic name: PC

Actual opening shrinkage: 0.0045

Mold opening product type: car audio button

Plastic name: PC

Actual opening shrinkage: 0.0036

Mold opening product type: notebook battery case

Plastic name: PC

Actual opening shrinkage: 0.6%

Mold opening product type: socket

Plastic name: PC

Actual opening shrinkage: 0.005

Mold opening product type: CD button

Plastic name: PC

Actual opening shrinkage: 0.006

Mold opening product type: switch

PS(polystyrene)

Plastic name: PS

Actual opening shrinkage: 0.005

Opening product type: Toshiba, Hualing refrigerator drawer, toys

Plastic name: PS

Actual opening shrinkage: 0.0045

Mold opening product type: printer product

Plastic name: PS

Actual opening shrinkage: 0.005

Mold opening product type: accessories

PVC

Plastic name: PVC

Actual opening shrinkage: 0.025

Mold opening product type: auto parts

Plastic name: PVC

Actual opening shrinkage: 0.03

Mold opening product type: password box handle

Plastic name: PVC

Actual opening shrinkage: 0.02

Mold opening product type: medical equipment, waterproof ring

Plastic name: PVC

Actual opening shrinkage: 0.005

Mold opening product type: blow molding bottle

Plastic name: PC

Actual opening shrinkage: 1.015

Mold opening product type: transparent cover of lamp

Plastic name: CPVC

Actual opening shrinkage: 0.015

Mold opening product type: water pipe joint

PMMA

Plastic name: PMMA

Actual opening shrinkage: 0.000~0.004

Mold opening product type: mobile phone lens

Plastic name: PMMA

Actual opening shrinkage: 0.002

Mold opening product type: lens

Plastic name: PMMA

Actual opening shrinkage: 0.005

Mold opening product type: lens

Plastic name: PMMA

Actual opening shrinkage: 0.03

Mold opening product type: mobile phone lens

POMPolyformaldehyde

Plastic name: POM

Actual opening shrinkage: 0.025

Mold opening product type: kitchen supplies, plastic gear

Plastic name: POM

Actual opening shrinkage: 0.02

Type of mold opening products: Siemens accessories (support parts), fire regulating ring, printer housing, Canon printer tooth wheel, plastic gear

Plastic name: POM

Actual opening shrinkage: 16/1000

Mold opening product type: rubber wheel

Plastic name: POM

Actual opening shrinkage: 0.000

Mold opening product type: mobile phone chute (wall thickness 0.15)

Plastic name: POM

Actual opening shrinkage: 1.025

Mold opening product type: baby carriage product (large product, wall thickness)

Plastic name: POM

Actual opening shrinkage: 0.018

Type of mold opening products: remote control, switch, bracket, cosmetic container (tooth stick), small structural parts, wall thickness of 1.5-2mm, washing machine accessories, gear, rack, Sony, Panasonic and other mobile phone charger internal structural parts

Plastic name: POM

Actual opening shrinkage: 0.020-0.025

Mold opening product type: gear

Plastic name: POM, POM M90-44

Actual opening shrinkage: 0.018

Mold opening product type: pinion

Plastic name: POM TR-20

Actual opening shrinkage: 0.015

Mold opening product type: movement

Plastic name: POM

Actual opening shrinkage: 0.017

Mold opening product type: toy car wheel

Plastic name: POM

Actual opening shrinkage: 0.01

Mold opening product type: switch

Plastic name: POM

Actual opening shrinkage: 0.022

Mold opening product type: cam follower

PBT

Plastic name: PBT

Actual opening shrinkage: 1.02 transversely and 1.016 longitudinally

Model opening product type: router antenna


Plastic name: PBT+30% GF

Actual opening shrinkage: 0.004

Mold opening product type: Top and bottom cover of security device, support/bracket


Plastic name: PBT

Actual opening shrinkage: 1.015

Mold opening product type: electrical shell


Plastic name: PBT

Actual opening shrinkage: 0.005

Mold opening product type: small household appliances


Plastic name: PBT+30% GF

Actual opening shrinkage: 0.0045

Mold opening product type: cooling fan


Plastic name: PBT+30% GF

Actual opening shrinkage: 0.5%

Mold opening product: AC fan


Plastic name: PBT+G6

Actual opening shrinkage: 0.005

Mold opening product type: computer fan backplane

HIPS

Plastic name: HIPS

Actual opening shrinkage: 0.0045

Mold opening product type: Philips remote control lower cover, Philips remote control battery cover, Samsung remote control battery cover, LG remote control lower cover, LG remote control battery cover


Plastic name: HIPS

Actual opening shrinkage: 0.005

Mold opening product type: Philips remote control upper cover LG, remote control upper cover, Yamaha motorcycle speaker


LCP

Plastic name: LCP

Actual opening shrinkage: 1.5~2/%

Mold opening product type: connector


Plastic name: LCP

Actual opening shrinkage: 0.002

Mold opening product type: coil framework, computer connector, connector


Plastic name: LCP

Actual opening shrinkage: 0.001-0.002

Mold opening product type: computer connector


Plastic name: LCP

Actual opening shrinkage: 0.001

Mold opening product type: electricity meter, connector


Plastic name: LCP

Actual opening shrinkage: 0.003

Opening product type: BOBBIN


Plastic name: LCP

Actual opening shrinkage: 0.001-0.002

Mold opening product type: computer connector

Other plastics

Plastic name: EVA

Actual opening shrinkage: 0.025

Mold opening product type: kitchen supplies

Plastic name: SAN

Actual opening shrinkage: 0.004

Mold opening product type: kitchen supplies

Plastic name: SAN

Actual opening shrinkage: 0.005

Mold opening product type: small household appliances

Plastic name: ABS+PA

Actual opening shrinkage: 0.007

Mold opening product type: auto parts (reflector)

Plastic name: ABS+PC

Actual opening shrinkage: 0.004

Mold opening product type: mobile phone cover bottom cover

Plastic name: ABS+PC

Actual opening shrinkage: 0.0035

Mold opening product type: car display panel

Plastic name: ABS+PC

Actual opening shrinkage: 0.005

Mold opening product type: mobile phone case

Plastic name: PC+ABS

Actual opening shrinkage: 0.045

Mold opening product type: optical drive tray

Plastic name: PPS+30% GF

Actual opening shrinkage: 0.0045

Mold opening product type: range finder movement

Plastic name: ABS+PA

Actual opening shrinkage: 0.007

Mold opening product type: auto parts (reflector)

Plastic name: PPR

Actual opening shrinkage: 0.017

Mold opening product type: water pipe joint

Plastic name: AS

Actual opening shrinkage: 0.004

Mold opening product type: shell

Plastic name: TPU

Actual opening shrinkage: 0.010

Mold opening product type: mobile phone rubber plug USB interface rubber plug

Plastic name: RUBBER

Actual opening shrinkage: 0.030

Mold opening product type: mobile phone RUBBER key

Plastic name: PCTA

Actual opening shrinkage: 0.003

Mold opening product type: cosmetics

Plastic name: PETG

Actual opening shrinkage: 0.004

Mold opening product type: cosmetics

Plastic name: AS

Actual opening shrinkage: 0.005

Mold opening product type: cosmetics

Plastic name: TPR

Actual opening shrinkage: 0.015

Mold opening product type: car tire

Plastic name: NTF FR52

Actual opening shrinkage: 3~5/% 0

Mold opening product type: connector

Plastic name: TPR

Actual opening shrinkage: 0.012

Mold opening product type: soft rubber

Plastic name: H161

Actual opening shrinkage: 0.008

Mold opening product type: meter bottom shell

Plastic name: AS

Actual opening shrinkage: 0.005

Mold opening product type: cosmetics

ABS camera housing 0.005

PP plastic barrel 0.016

SAN0.004

PC+ABS electrical enclosure 0.005

PC transparent shell 0.006

PVC plug 0.018

POM gear 0.024

PMMA lamp 0.004

PEI electrical enclosure 0.0035

PA6+30%GF 0.005   20%GF 0.006   15%GF  0.0075

Japan Pioneer Engineering Materials:

AS-GF20         0.003

PP-GF25         0.004

ABS+PBT+GF25       0.004

The above three materials are car audio accessories.

Plastic name: TPR TPE

Actual opening shrinkage: 0.020

Mold opening product type: golf accessories

Plastic name: ABS (1.005)

PP (1.018)

PVC (1.018)

POM (1.018)

TPE (1.018)

TPU (1.01)

All the above are for earplug products.

Plastic name: TPE

Actual opening shrinkage: 1.016 transversely and 1.022 longitudinally

Model opening product type: router antenna

Plastic name: PPS+30GF

Actual opening shrinkage: 1.0025

Mold opening product type: DVD movement

ABS X1.005 Y 1.0038 Z 1.005 Any refrigerator handle and frame bar

Plastic name: PPR

Actual opening shrinkage: 0.017

Mold opening product type: water pipe joint

Plastic name: PPS+40% wave fiber

Actual opening shrinkage: 0.0025

Mold opening product type: HID product series

Plastic name: PB

Actual opening shrinkage: 0.018

Mold opening product type: floor heating equipment, pipe, joint

Plastic name: dr101

Actual opening shrinkage: 0.010

Mold opening product type: key components of measuring instruments

Plastic name: UF (thermosetting plastic)

Actual opening shrinkage: 0.007

Mold opening product type: household switch socket panel

Plastic name: PPA

Actual opening shrinkage: 0.005

Mold opening product type: auto parts

Plastic name: PPS

Actual opening shrinkage: 0.009

Mold opening product type: auto parts

Plastic name: PET

Actual mold opening shrinkage: broken bottle

Mold opening product type: 1.005

Plastic name: ABS+PA

Actual opening shrinkage: 0.007

Plastic name: PBT+15% GF

Actual opening shrinkage: 1.003

Coupler of electrical components of mold opening products

Plastic name: PEI

Actual opening shrinkage: 1.005

Open product: electrical components, coupling, medical equipment

Plastic name: PPo

Actual opening shrinkage: 1.005

Mold opening product: medical equipment

Plastic name: ABS+PA

Actual opening shrinkage: 0.007

Mold opening product type: auto parts (reflector)

Plastic name: PC+GF45

Actual opening shrinkage: 0.001

Mold opening product type: mobile phone case

Plastic name: PC+GF20

Actual opening shrinkage: 0.002

Mold opening product type: mobile phone case

Plastic name: PC+ABS

Actual opening shrinkage: 0.004.5

Mold opening product type: mobile phone case

Plastic name: PPE

Actual opening shrinkage: 0.004

Mold opening product type: structural part, wall thickness 2mm

Plastic name: PC+ABS

Actual opening shrinkage: 0.005

Mold opening product type: automobile wiper handle

Plastic name: ABS/PC

Actual opening shrinkage: 0.005

Mold opening product type: printer housing

Plastic name: PP+EPDM+T10

Actual opening shrinkage: 0.013

Mold opening product type: auto parts (interior panel)

Plastic name: PP+EPDM+T20

Actual opening shrinkage: 0.012

Mold opening product type: auto parts (interior panel)

Plastic name: PP+EPDM+T30

Actual opening shrinkage: 0.010

Mold opening product type: auto parts (interior panel)

Plastic name: PP+T20

Actual opening shrinkage: 0.012

Mold opening product type: auto parts (ABCD pillar)

Plastic name: TPU

Actual opening shrinkage: 0.017

Mold opening product type: switch housing

Plastic name: pc+as

Actual opening shrinkage: 0.005

Mold opening product type: printer shell

Plastic name: pps

Actual opening shrinkage: 0.002

Mold opening product type: computer fan backplane

Plastic name: eps polystyrene

Actual opening shrinkage: 0.003

Mold opening product type: foam packaging

Plastic name: PC+ABS

Actual opening shrinkage: 0.005

Mold opening product type: mobile phone case

Plastic name: PPE+PS+20% GF

Actual opening shrinkage: 0.0035

Mold opening product type: cooling fan

Plastic name: PTE

Actual opening shrinkage: 1.0%

Mold opening product type: electric shaver

Plastic name: PU

Actual opening shrinkage: 0

Mold opening product type: roller brush

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