Plasticizer-Induced Stress Cracking of Rigid PVC vs
This whitepaper explains the cause and impact of plasticizer-induced stress cracking, as well as the relative stress crack-resistance of specialty-formulated rigid PVC versus polycarbonate (et al) when exposed to PVC plasticizers commonly used in PVC medical tubing applications.
Stress cracking of rigid polyvinyl chloride by plasticizer
Rubber impact modifier added to the rigid PVC had no effect on ESC. Environmental stress cracking can be avoided by using flexible PVC that has a non-migrating plasticizer or by designing the product so that rigid PVC is not stressed while in contact with plasticized PVC. Volume6, Issue4 December 1984 Pages157-161 Related Information
Plasticizer-Induced Stress Cracking of Rigid PVC and
Research shows that when stress is introduced into polymer part regions in contact with plasticized PVC, plasticizer-induced stress cracking will occur much more rapidly than if the region of the part in contact with the flexible PVC is not under stress.
Stress cracking of rigid polyvinyl chloride by plasticizer
Environmental stress cracking (ESC) (failure caused by crack and craze formation at a stress less than the yield stress) reduces the service life of many plastic products. This paper is concerned wit...
What is the best alternative to DEHP for medical-grade PVC
The stress cracking or crazing that weakens the rigid component takes place more slowly with TOTM than with DOTP. “It is important to put this advantage of TOTM in perspective,” stresses Galland. “DOTP may cause more crazing than TOTM but resists crazing better than other alternative plasticizers and even better than DEHP.
- Does plasticizer cause stress cracking in polycarbonate?
- The results show the PeG-3,700 compounds induce more stress cracking in polycarbonate as the amount of plasticizer is increased. Polycarbonate exposed to PeG-12,000, PeG-24,000, PeA-150,000 and PeS-160,000 shows no evidence of stress cracks until 100 PPHR is reached.
- Does PVC plasticized polycarbonate crack?
- The polycarbonate specimens show no evidence of stress cracking when in contact with PVC plasticized by the PeS-160,000 polyester. The compound containing PeS-5,000 induces minimal cracking of polycarbonate. The visible signs of stress-crack development in polycarbonate are one way of evaluating performance in a specific environment.
- Are plasticizers a stress-cracking agent?
- In this case, ester plasticizers have been cited as stress-cracking agents. 1,3 Flexible PVC for medical tubing has been traditionally plasticized with monomeric diesters and triesters. The majority of monomeric diester plasticizers used are of the phthalate type.
- Why do flexible PVC compounds crack?
- The majority of the flexible PVC compounds used in medical applications are plasticized by monomeric esters. Over a period of time, these monomeric esters migrate readily to the stressed polycarbonate surface and induce crazing and cracking. This problem has been investigated in the past using a variety of experimental techniques.
- Do high-viscosity plasticizers crack polycarbonate?
- Certain high-viscosity polymeric plasticizers over 100,000 centipoise and several in the I0,000–25,000 range did not stress crack polycarbonate. However, viscosity is not the only determinant. Chemical type, level of use, polarity and severity of the environment all contribute to crack development in stressed polycarbonate.
- What causes stress cracking of polycarbonate?
- Several types of materials can cause stress cracking of polycarbonate. In this case, ester plasticizers have been cited as stress-cracking agents. 1,3 Flexible PVC for medical tubing has been traditionally plasticized with monomeric diesters and triesters.
