Environmentally sealed terminating device and sealing gel
View Patent ↗A terminating device for terminating subscriber wiring to pairs of insulation displacement type conductive contacts includes a protective sealing gel disposed within the terminating device. The gel encapsulates the conductive contacts and is characterized by a dynamic storage modulus G′ and a dynamic loss modulus G″ expressed in dynes/cm 2 having a dynamic crossover point between about 1 rad/sec and about 20 rad/sec at any temperature in the range between about −40° C. to about 80° C. The loss modulus G″ is greater than the storage modulus G′ at a shear frequency greater than the dynamic crossover point and is less than the storage modulus G′ at a shear frequency less than the dynamic crossover point. The gel has an ultimate elongation greater than about 1000%, an ultimate tensile strength greater than about 2 psi, and a cone penetration value expressed in tenths of a millimeter between about 255 and 265.
1. A terminating device comprising:
a base;
at least one pair of insulation displacement contacts disposed within the base;
a wire engagement member for engaging at least one conductive wire in a corresponding one of the insulation displacement contacts;
a protective sealing gel encapsulating the at least one pair of insulation displacement contacts, the gel having a dynamic crossover point expressed in rad/sec, and a dynamic storage modulus G′ and a dynamic loss modulus G″ expressed in dynes/cm 2 ; and
wherein at any temperature between about −40° C. and about 80° C. the dynamic crossover point of the gel is between about 1 rad/sec and about 20 rad/sec, the dynamic loss modulus G″ is greater than the dynamic storage modulus G′ at a shear frequency greater than the dynamic crossover point and the dynamic loss modulus G″ is less than the dynamic storage modulus G′ at a shear frequency less than the dynamic crossover point.
2. The terminating device according to claim 1 wherein the dynamic crossover point is between about 5 rad/sec and 20 rad/sec.
3. The terminating device according to claim 1 wherein the dynamic storage modulus G′ is greater than about 800 dynes/cm 2 at a shear frequency less than about 0.5 rad/sec and at a temperature of about 30° C.
4. The terminating device according to claim 1 wherein the dynamic storage modulus G′ is between about 800 dynes/cm 2 and about 1200 dynes/cm 2 at a shear frequency less than or equal to about 0.5 rad/sec and at a temperature of about 30° C.
5. The terminating device according to claim 4 wherein the dynamic loss modulus G″ is less than about 300 dynes/cm 2 .
6. The terminating device according to claim 1 wherein the dynamic storage modulus G′ is between about 600 dynes/cm 2 and about 1200 dynes/cm 2 at a shear frequency of about 1 rad/sec at any temperature between about −40° C. and about 80° C.
7. The terminating device according to claim 6 wherein the ratio of the dynamic loss modulus G″ to the dynamic storage modulus G′ (tan δ=G″/G′) is less than about 1.0.
8. The terminating device according to claim 1 wherein the dynamic loss modulus G″ is greater than the dynamic storage modulus G′ at a shear frequency of about 100 rad/sec, and wherein the ratio of the dynamic loss modulus G″ to the dynamic storage modulus G′ (tan δ=G″/G′) is greater than about 1.1.
9. The terminating device according to claim 1 wherein the gel has a relaxation time less than about 0.5 seconds at a temperature of about 30° C.
10. The terminating device according to claim 1 wherein the gel has an ultimate elongation greater than about 1000%.
11. The terminating device according to claim 1 wherein the gel has an ultimate breaking strength greater than about 2 psi.
12. The terminating device according to claim 1 wherein the gel has a cone penetration value expressed in tenths of a millimeter between about 255 and about 265 at about 23° C.