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Checking thermoplastic resins for ultrasonic weldability can save you time and money.
Table of comparative ultrasonic weldabilites:
| MATERIAL | CLOSE WELDING | DISTANT WELDING | COMMENTS |
| GP Polystyrene, crystal | Excellent | Excellent | This is the material with the best weldability. Critical distance: 12 cm. |
| GP Polystyrene | Excellent | Excellent | Very good acoustic properties. Excess power splits one part at its centre (central flash). |
| Medium impact polystyrene | Excellent | Good | Requires more power than standard polystyrene. Critical distance: 3 cm |
| High Impact polystyrene | Good | Mediocre | Disappointing results when there is too much butadiene filler. |
| S.A.N. and A.S. | Very good | Good | Critical distance: 4 cm |
| ABS | Very good | Good | Comparable properties with polystyrene. |
| High Impact ABS and fire-retardant grades of ABS | Difficult | Nil | The butadiene filler renders the part absorbent. The sonotrode marks the support surface. |
| Injection moulded acrylic | Very good | Mediocre | Requires a large sonotrode span to avoid sinking into the part. |
| Impact grades of acrylic | Good | Mediocre | The butadiene filler reduces weldability. |
| Extruded or cast acrylic | Bad | Bad | Appearance ruined. Weldability nil. |
| Polycarbonate | Excellent | Good | Requires a lot of power. Critical distance: 2 cm. |
| Acetal | Good | Mediocre | Porous fusion. Made gastight by specially designed welding joint. |
| Nylons | Good (according to geometry) | Bad | Requires a special welding joint. Welding necessary immediately following moulding or after curing. Requires a lot of power. |
| Nylon 6/6 | Very good | Good | Critical distance: 1 cm which is exceptional for a nylon. Curing improves results. |
| Glass-filled nylon | Very good | Mediocre | Very strong assemblies. Requires a great deal of power. |
| Polypropylene | Good | Mediocre | Requires a lot of power. Disappointing results in view of the shapes. Each problem is a special case. The glass filler improves results. |
| Acetate | Good | Nil | Success limited to hard type acetates. |
| Cellulose Acetobutyrate (CRB) | Mediocre | Nil | |
| High denisty polyethylene | Good | Nil | Sucess limited to welding sheet and for sealing bottles and tubes. |
| Low density polyethylene | Good | Nil | Sucess limited to welding sheet and for sealing bottles and tubes. |
| Complex films: Polyethylene-Aluminium- Polypropylene | Good | Nil | Possibilty of continuous welding. |
| Polyphenylene oxide
PPO |
Good | Limited | Critical distance: 1 cm. Requires a lot of power. |
| Polysulfone | Good | Limited | Requires a lot of power. |
| NORYL® PPO® + PS | Good | Limited | Critical distance: 2 cm. |
| NORYL®
PPO® + PS (glass-filled) |
Very good | Limited | The glass filler improves the assembly considerably. |
| CELANEX ® Poly-Butyl-Terephthalate |
Good | Limited | Critical distance: 2 cm. |
| P.V.C. | Good | Mediocre | Good results on rigid P.V.C. |
| Plasticised P.V.C. Film | Good | Nil | Limited to welding with pincers. |
DISCLAIMER: THE MATERIALS
AND PRODUCTS OF THE BUSINESSES MAKING UP THE GE PLASTICS UNIT OF GENERAL ELECTRIC COMPANY, ITS
SUBSIDIARIES AND AFFILIATES ("GEP"), ARE SOLD SUBJECT TO GE POLYMERLAND'S STANDARD CONDITIONS
OF SALE, WHICH ARE INCLUDED IN THE APPLICABLE DISTRIBUTOR OR OTHER SALES AGREEMENT, PRINTED ON
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RECOMMENDATIONS, OR ADVICE CONTAINED HEREIN IS GIVEN IN GOOD FAITH, GE POLYMERLAND MAKES NO WARRANTY
OR GUARANTEE, EXPRESS OR IMPLIED, (I) THAT RESULTS DESCRIBED HEREIN WILL BE OBTAINED UNDER END-USE
CONDITIONS, OR (II) AS TO THE EFFECTIVENESS OR SAFETY OF ANY DESIGN INCORPORATING GE POLYMERLAND
MATERIALS, PRODUCTS, RECOMMENDATIONS OR ADVICE. EXCEPT AS PROVIDED IN GE POLYMERLAND'S STANDARD
CONDITIONS OF SALE, GE POLYMERLAND AND ITS REPRESENTATIVES SHALL IN NO EVENT BE RESPONSIBLE FOR
ANY LOSS RESULTING FROM ANY USE OF ITS MATERIALS OR PRODUCTS DESCRIBED HEREIN.
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user must identify and perform all tests and analyses necessary to assure that its finished parts
incorporating GE Polymerland materials or products will be safe and suitable for use under end-use
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