This report is the first in a series of five that will provide information on new or emerging bridge strengthening methods for bridge owners and bridge engineers. Results and Discussion. Kevlar is a well-known ultra-strong para-aramid synthetic macroscale fiber with a high tensile strength-to-weight ratio. 28,29 Typical threads and fibers of Kevlar consist of long molecular chains produced from PPTA (poly-paraphenylene terephthalamide) between which there are inter-chain bonds making the material extremely strong and stiff with a tensile strength 3.6 ... Paradichlorobenzene PDCB (CAS 106-46-7) is white flaky or particle crystal,insoluble in water, soluble in ethanol,ethyl ether, benzene and other organic solvents. 1,4-Dichlorobenzene (P-DCB or para-dichlorobenzene, sometimes abbreviated as PDB or para) is an organic compound with the formula C6H4Cl2. Use Nylon 6(3)t[poly(trimethyl hexamethylene terephthalamide)] for fast, easy, and consistent DNA/RNA Purification, Antibody/Protein Purification, Cell Isolation.