Shear adhesion testing measures the load a bonded joint carries when two adherends are pulled in opposite directions along the bond line. ASTM D3163 and ASTM D3164 both apply that idea to adhesively bonded plastic lap-shear joints under tension loading, and each one defines a different joint. What Shear Adhesion Testing Measures In a lap-shear…
ASTM D570 is the standard test method for water absorption of plastics. It measures the relative rate at which a plastic absorbs water when immersed, and it reports the result as percent weight gain. What ASTM D570 Covers ASTM D570 (the current edition is D570-22) determines the relative rate of absorption of water by plastics…
ASTM E1269 determines the specific heat capacity of a material by differential scanning calorimetry (DSC), comparing the heat flow into a specimen with the heat flow into a sapphire reference. The result is a measured value for the energy a material absorbs per unit of mass for each degree of temperature rise. What ASTM E1269…
A coating can pass weathering, humidity and salt spray testing and still chip or delaminate in its first year on the road. Chip resistance (gravelometer) testing and paint adhesion testing after exposure show whether the coating holds up to stone impact and stress before launch.
Two suppliers submit weathering data for the same OEM program. Both use xenon arc equipment. Both run the same number of hours. One submission is accepted. The other is rejected. The difference isn’t the equipment or the hours. It’s the method. The rejected lab ran a general xenon cycle. The accepted lab ran the specific…
UV damage is relentless, and it rarely shows up on day one A polymer part can look flawless at launch and still fail in the field. UV damage works like slow mechanical fatigue: you do not notice the early hits, then one day the surface chalks, the color shifts, the gloss drops, or a once-tough…
Let’s start with what we know. Ghesquiere Plastic Testing, Inc. in Harper Woods, Michigan has successfully renewed its A2LA Accreditation for ISO/IEC 17025:2017 compliance in mechanical testing. Our accreditation remains in effect through December 31, 2027 under A2LA Certificate No. 0079.01. For current and prospective automotive clients, this is not a ceremonial badge. It’s independent…
In the high-stakes world of automotive and manufacturing supply chains, missed deadlines and rejected parts are costly. The best strategy for minimizing these risks is simple: Raise your standards with an accredited testing partner. When choosing the right lab to handle your critical material testing, accreditation should be a top priority. A2LA (the American Association…