ISO 9001:2015 Certified Manufacturer
In-House
TPR Insert Molding
TPR grip molding within our facility, allowing complete brand customization without external suppliers. OEM customers receive finished, branded components from a single dependable source.
Solution
1 Stop
In-House Production
Expertise
38+
Years Experience
On-Time Delivery
99%
Reliable Delivery Rate
TPR Insert Molding
JoinCast provides in-house TPR insert moulding primarily for pneumatic tool handles and grips. We injection mould thermoplastic rubber directly onto die cast aluminum components, giving you improved slip resistance, ergonomic comfort, and enhanced product feel for end users. This capability is fully integrated within our production workflow.
Our in-house printing line applies custom logos and branding to aluminum components using single-color screen printing. You can specify your branding requirements, and we complete printing on-site before final inspection and shipment so there is no need to coordinate with separate finishing vendors.
We can offer custom finishes with different shore hardness to suit your particular applications and durability requirements. Our in-house expertise in TPR insert mold making allows us to handle complex shapes and ensure perfect molding results for your brand
In-House
TPR Insert Molding
Custom
Logo Printing
Single-Source
Finishing
TPR Insert Molding FAQ
What TPR hardness options are available for tool grips and handles?
We offer TPR durometers ranging from Shore A 40 (soft, cushioned feel) to Shore A 70 (firmer, more durable) depending on your application requirements.
Pneumatic tool handles typically use Shore A 50-60 for optimal grip comfort during extended use, while other applications may require firmer TPR for mechanical durability. We can provide samples at different harnesses for your evaluation.
How do you ensure the TPR bonds properly to the aluminum casting?
Aluminum surfaces undergo specific preparation including degreasing and primer application before TPR injection molding. The combination of mechanical interlocking (achieved through designed undercuts in the casting) and chemical adhesion creates permanent bonds that withstand tool operation stresses.
We can perform pull-testing on first articles to validate bond strength for your application.
Can you mold TPR over powder-coated or anodized aluminum surfaces?
TPR adhesion works best on bare aluminum or specifically formulated primers. Powder coating and anodizing create barrier layers that prevent proper TPR bonding.
What printing methods do you use for logos and branding on aluminum parts?
For multi-color logos or complex graphics, we can recommend laser etching or external specialized printing partners.
How durable is pad printing on parts that will be handled frequently or exposed outdoors?
Pad printing on properly prepared aluminum surfaces withstands normal handling, but high-wear areas like grip surfaces or frequently touched controls will show wear over time.
For pneumatic tools and marine hardware exposed to solvents, UV, or abrasion, we recommend printing on non-contact surfaces. UV-resistant inks are available for outdoor applications, and we can perform adhesion testing per your requirements.
Can you match specific Pantone colors for printed logos on my products?
Yes, we can match Pantone colors for pad printing, though final appearance varies slightly based on substrate color and surface texture. We recommend providing physical color samples or approved parts for matching rather than relying solely on Pantone numbers.
First article samples will be submitted for your approval before production printing begins.
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Certifications & Quality
ISO-Certified Quality & Advanced Inspection Component Inspection
We use Keyence 3D Scanning Systems for dimensional verification and 3D CMMs for micron-level dimensional accuracy verification
- Keyence 3D Scanning
- Mitutoyo 3D CMM Verification
- Dedicated 10 Member QC Team
High Quality Castings for Key Industries
Marine Components
Outboard Lower Unit Housing
- Alloy: ADC-3 / A383
- Weight Range: ~1.4 kg
- Finish: Chromate conversion
Pneumatic Tools
Pneumatic Tool Housing
- Alloy: ADC-12 / A360
- Weight Range: 0.3 – 0.9 kg
- Finish: Powder coat, paint, or anodized metal look
Heat Sink & Controller
Die-Cast Heat Sink
- Alloy: ADC-12 / A360
- Weight Range: ~0.4 kg
- Finish: Anodizing / Powder Coating
Lighting
LED Heat Sink Housings
- Alloy: ADC-12 / A360
- Weight Range: 0.2 – 0.9 kg
- Finish: Powder coat or anodizing
Medical Equipment
Medical Device Housing
- Alloy: ADC-12 / A360
- Weight Range: 0.4 – 1.1 kg
Custom Applications
Complete Manufacturing Solution
From Design to Delivery: Full-Service Die Casting
At Joincast we keep every critical process in-house at Joincast, operating from a 9,900 m² facility to deliver dependable lead times and consistent quality. Across three production sites, we run die casting machines (135T–900T), CNC machining centers with automation, plus fully integrated surface treatment lines.
From small precision parts to castings up to 3 kg, we process ADC-12 / A360 and ADC-3 / A383 aluminum alloys in a 24-hour, single-supplier operation.
Our Production Capabilities
Mold Engineering
Die Casting
Polishing & Shot Blasting
CNC Machining
Surface Treatment
TPR Insert & Printing
Quality Inspection
