Medical Laboratory Testing: Two Shot / Over Mold
Two Shot / Over Mold testing measures the adhesion strength between different materials molded together in a single part. The test uses peel, shear, or cross-cut methods to evaluate how well the materials bond at the interface. For medical manufacturers, strong interfacial adhesion is essential for multi-material grips, housings, seals, and components to prevent delamination during use, sterilization, or handling.
Reliable bonding between different materials in two-shot or overmolded parts ensures structural integrity and functionality. Weak adhesion can lead to separation, contamination, or device failure. Applus+ Reliable Analysis already maintains accredited adhesion and bond strength testing capabilities, integrated with our coating, scratch, and material characterization programs.
These evaluations support material qualification and durability requirements for multi-material medical devices. Manufacturers use two-shot / over mold adhesion data to qualify bonds that remain secure under clinical stresses. Applus+ Reliable Analysis delivers consistent, reproducible results using equipment already operating daily under our ISO/IEC 17025 accreditation.
Common Two Shot / Over Mold Medical Testing Standards
ASTM D3359 Standard Test Methods for Rating Adhesion
ASTM D3359 rates the adhesion of coatings or overmolded layers by making a lattice pattern of cuts and applying adhesive tape to assess removal. The standard provides a visual rating scale for the degree of detachment. It is widely used for two-shot or overmolded medical device housings, grips, and multi-material components to ensure layers remain firmly bonded without delamination during use or sterilization.
ASTM D903 Peel or Stripping Strength of Adhesive Bonds
ASTM D903 measures the peel or stripping strength of bonds by pulling a flexible layer at a 180-degree angle from a substrate. The test records the average force required to separate the interface. It is particularly valuable for flexible-to-rigid overmolded medical grips, seals, and multi-material devices to ensure reliable adhesion that can withstand handling and sterilization.
ASTM D3359 / ISO 2409 Cross-Cut for Overmold Coatings
The combination of ASTM D3359 and ISO 2409 uses the cross-cut method to assess adhesion of overmolded or coated layers by cutting a lattice pattern and applying tape. The standards rate the amount of coating removal. It is widely applied to painted or overmolded medical equipment, instrument finishes, and surfaces to verify strong bonding after mechanical stress or cleaning.
ASTM D1002 Apparent Shear Strength of Adhesively Bonded Specimens
ASTM D1002 determines the apparent shear strength of bonded joints by applying tension to a single-lap specimen until failure. Adapted for overmold interfaces, it measures shear bond performance. It is relevant for medical multi-material assemblies and overmolded components where shear strength at the interface is critical for structural integrity during use.
Your Partner for Expert Medical Two Shot / Over Mold Testing
Applus+ Reliable Analysis stands ready to support your medical two shot and over mold adhesion testing needs. Our ISO/IEC 17025 accredited laboratory already maintains the necessary peel, shear, and cross-cut testers, allowing us to efficiently add these medical standards with only minor validation and training.
Whether you are qualifying new grips and housings, validating multi-material components, or ensuring overmold performance, our team provides accurate and reliable data backed by decades of materials testing expertise. We invite you to Contact us to discuss how our expanded medical testing capabilities can support your next project or regulatory submission.
Additional Applus+ Reliable Analysis’ Commercial Medical Testing Capabilities
Whether it be material EMC, environmental, fabrication, or durability testing, Applus+ Reliable Analysis has a full lab of test equipment, which permits us to provide short lead times on scheduling. Our team strives to give our customers more time and energy on product development rather than testing.
Below is a list of common medical testing types that Reliable Analysis offers. Don’t see what you are looking for? Contact us, and we will determine the best course of action.
