Precision Machining
- CNC Machining Service
- CNC Milling
- CNC Turning
- Automatic Turning
- Machining Screw/Rivet
- Wire EDM Machining
- Casting & CNC
- Aluminum Profile & CNC
- Cold Heading & CNC
LML Metal Products Ltd.No. D309, Yunchuang E Valley, No. 3 Huanshi West Road, Tangxia Town, Dongguan City, Guangdong,China
(86) 17833674102dlynn9527@gmail.com
All injection Molding Plastics
Over 20 different kinds of surface finishes for you.Make your part more corrosion resistant and aesthetical.
Home / All injection molding plastics
Injection Molding Materials
Performance and Application Comparison
| Image | Material | Key Grades | Key Properties | Typical Applications | Processability |
|---|---|---|---|---|---|
 | Polypropylene (PP) | Homopolymer, Copolymer, Glass-filled | Density: 0.89–0.91 g/cm³; Chemical resistance; Microwave-safe | Food containers, automotive parts, medical packaging | Melt temp: 200–300°C; Shrinkage: 1.5–2.5% |
 | Polyethylene (PE) | HDPE, LDPE, UHMWPE | HDPE rigidity: 0.94–0.97 g/cm³; LDPE flexibility: 0.91–0.93 g/cm³ | Bottle caps, pipes, plastic bags, tubes | Melt temp: 180–280°C; Shrinkage: 2.0–4.0% |
 | Polystyrene (PS) | GPPS, HIPS, EPS | ≥90% light transmittance; Rigid but brittle | Disposable cutlery, CD cases, instrument housings | Melt temp: 180–280°C; Shrinkage: 0.4–0.7% |
 | ABS | Standard, Flame-retardant, High-impact | Impact strength: 20–40 kJ/m²; Glossy surface; Moderate weather resistance | Electronics housings, LEGO bricks, automotive interiors | Melt temp: 210–250°C; Shrinkage: 0.5–0.7% |
 | Polyamide (Nylon) | PA6, PA66, PA11, Glass-filled | Tensile strength: 80 MPa; Self-lubricating; Hygroscopic | Gears, bearings, sports equipment | Pre-drying required (80–120°C); Melt temp: 260–290°C |
 | Polycarbonate (PC) | Standard, Optical, Flame-retardant | Impact resistance: >60 kJ/m²; 90% transparency; HDT 130–140°C | Bulletproof glass, helmets, medical devices | Melt temp: 280–320°C; Prone to stress cracking |
 | POM | Homopolymer, Copolymer, PTFE-lubricated | Flex modulus: 2.5–3.5 GPa; Low friction (μ=0.15–0.25) | Precision gears, bearings, zipper teeth | Melt temp: 190–210°C; Mold temp: 80–120°C |
 | PMMA | Cast, Extruded, Impact-modified | 92% light transmittance; UV-resistant; High surface hardness | Lenses, signage lightboxes, automotive taillights | Melt temp: 240–260°C; Scratch-prone |
Technical Notes:
Material Selection Guide
- Chemical Resistance: PP/PE resist acids/alkalis (e.g., detergent containers) [6](@ref)
- High-Temperature: PEEK/PPS replace metals in >200°C environments (e.g., engine parts)
- Optical Needs: Use PC for impact-resistant transparency, PMMA for max. clarity
Processing Criticals
- Drying: PA/PC require 4–6 hours at 80–120°C (moisture ≤0.025%) to prevent bubbles
- Mold Temp: High-crystallinity materials (e.g., POM) need 80–120°C for dimensional accuracy
Sustainability & Compliance
- ♻️Recycling: PP/PE/PET mechanically recyclable (15–30% property loss) [5](@ref)
- ⚠️Hazard Alert: POM releases formaldehyde in acids—requires controlled disposal
LML's portfolio of Metals
Secondary operation will improve aestheic or prevent injuries from sharp corner of the products.
Knurling
After knurling, it can increase the sense of beauty of the part and make it easy to handle. It is often used for the outer surface processing of casing, hinge wrench and other parts
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Chamfering
After knurling, it can increase the sense of beauty of the part and make it easy to handle. It is often used for the outer surface processing of casing, hinge wrench and other parts
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Grinding
After knurling, it can increase the sense of beauty of the part and make it easy to handle. It is often used for the outer surface processing of casing, hinge wrench and other parts
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Heat Treatment
After knurling, it can increase the sense of beauty of the part and make it easy to handle. It is often used for the outer surface processing of casing, hinge wrench and other parts
learn more
welding
After knurling, it can increase the sense of beauty of the part and make it easy to handle. It is often used for the outer surface processing of casing, hinge wrench and other parts
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riveting
After knurling, it can increase the sense of beauty of the part and make it easy to handle. It is often used for the outer surface processing of casing, hinge wrench and other parts
learn moreCosmetic Finishes
Surface finishes can have either a functional or aesthetic intent. Finishes that cater to both aspects are classified as cosmetic finishes and are frequently employed for enhancing the appearance of different parts. The fabrication of these parts demands additional measures to minimize defects such as tool-induced marks and scratches.
Functional
There is no necessary to have aesthetic look.Machining veins will be seen
- Smooth machining
- Passivation
- TYPE III andozied
- Glossing
- Brushing
- Black oxide
- Mechanical Polishing
- Etching
- Degreasing
- Electroplating
- Electrophoresis deposition
Matte
slogan：Removes surface streaks and defects, make surface matt and rough
- Blasting
- Acid pickling
- Passivation
- Parkerising
Functional
There is no necessary to have aesthetic look.Machining veins will be seen
- Chemical or electrochemical polishing
- Blasting+Anodizing
- Glossing+Brushing
- Glossing+Polish
- Powder coating
Wide Array of Materials We Offer
Call on RapidDirect’s staff to recommend the right materials from our rich selection of metal and plastic materials with different colors, infill, and hardness. Every material we utilize comes from reputable suppliers and is thoroughly inspected to ensure they can be matched to various manufacturing styles, from plastic injection molding to sheet metal fabrication.
Competitive Prices
You are guaranteed 30% lower costs and competitive prices to help you settle your material and start your project.
Reliable supply chain
Apart from self-owned factory, we have thousands of suppliers to maintain a stable supply of materials.
Superior Quality
Each of our material bears certified material certification to guarantee excellent quality for your parts.
Professional Support
Creative engineers and technicians are happy to help and recommend the suitable material for you.
Gallery of Surface Finishing Parts Made by LML
The metal part can serve as functional or aesthetic purpose,and the way of usage will decide on the type of surface finish.
Defining an A and a B side
We can generate instant machining quotes for 50+ metals and plastics.
Surface finishing often leaves aesthetic defects on yourparts, such as hang marks for anodizing. Defining an Aand a B-side in your design will ensure that the most important areas of your part remain free of defects
In this image you can see how you can define an A-side and a B-side in your technical drawina:
A side: Indicates the most aesthetically importantsurface, typically the visible side of your product.
B side: Indicates the side that is not aesthetically important, typically the side hidden from visibility after assembly
For the primary surface (A-side) of your part, we guaranteedefect-free production. In contrast, secondary surfaces (B-side)may be machined with hanging marks and other minor defects. Bside surfaces, like the rest of your part, will be free of scratches.stains and blemishes.
Manufacturing Vetted Network of Our Services
We look forward to delivering high-quality products and professional services to meet your expectations and requirements.
Consistency requirements
Each part must be visually consistent across the same batch.meaning:
- Same grit must be used across parts for sanding orbrushing
- Brush marks must be in the same direction*
- Color must be consistent to the same pantone when parts are placed next to each other
- Gloss units must be consistent across the batch
* Manual brushing marks will be as unidirectional aspossible. Please note that for rounded geometries, brushingmarks may not be entirely unidirectional.*
Visual inspection conditions
The surface quality of every part must meet the followingconditions:
- Distance: 50cm +10cm (19,7 in + 3,9 in) with a 10/10 vision(or corrected)
- Incidence angle: Approximately 45 in all directions
- Lighting conditions: 500-1000 Lux, color 3300-5300 Kelvin(neutral white)
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The metal part can serve as functional or aesthetic purpose,and the way of usage will decide on the type of surface finish.
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FAQs
LML takes the stress out of manufacturing by guaranteeing the quality and consistency of every part. Each order is dimensionally and visually inspected by our in-house quality control team to make sure it meets the LML Standard. If you’re not satisfied with your order, we’ll remake your parts as fast as possible, free of charge, or refund you - whichever you prefer.
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Let's Work Together For Reciprocity and Mutual Benefit
LML Metal Products Ltd.No. D309, Yunchuang E Valley, No. 3 Huanshi West Road, Tangxia Town, Dongguan City, Guangdong,China
(86) 17833674102dlynn9527@gmail.com
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