Fine pitch connector socket

1. A fine pitch electrical connector socket comprising:

at least two opposing walls having a thickness of less than 1 mm, and

a passageway defined between the opposing walls for receiving an insert with contact pins, wherein

the opposing walls are formed from a fiber reinforced flame retardant thermoplastic polymer composition comprising a polyamide polymer, a flame retardant system and a fibrous reinforcing agent, and wherein

the polyamide polymer comprises at least a semi-crystalline polyamide (A) having a melting temperature Tm-A of at least 280° C., and optionally a second polyamide (B); and wherein

the polyamide polymer has a crystallization enthalpy ΔHc of at least 50 J/g, the melting temperature Tm-A and crystallization enthalpy ΔHc being measured by DSC with the method according to ISO11357-1/3 with a heating and cooling rate of 20° C.; and wherein

the flame retardant system comprises a combination of (C-1) a metal salt of dialkylphosphinate and/or diphosphinate and (C-2) a metal salt of phosphoric acid; wherein (C-1) and (C-2) are present in a combined amount of 5-35 wt. %, relative to the total weight of the composition and in a weight ratio C-1/C-2 in the range of 95/5-55/45; and wherein

the composition has a heat distortion temperature of at least 265° C., measured according to ISO 75-1/2.

2. The socket according to claim 1 , wherein the opposing walls have a thickness of about 500 micrometers (μm) or less.

3. The socket according to claim 1 , wherein the socket has intersecting walls dividing the passageway and separating the contact pins, the intersecting wall having a thickness of less than 300 micrometers (μm) or less.

4. The socket according to claim 1 , wherein the composition comprises a second polyamide (B) selected from the group consisting of amorphous semi-aromatic polyamides, aliphatic polyamides and combinations thereof.

5. The socket according to claim 1 , wherein the second polyamide (B) is selected from the group consisting of aliphatic polyamides having a melting temperature of less than 270° C., aliphatic polyamides with a melting temperature of at least 270° C. and a weight average molecular weight Mw-B of at most 5,000 dalton and combinations thereof.

6. The socket according to claim 1 , wherein polyamide (A) and polyamide (B) are present in a weight ratio A/B in a range of 100/0-50/50.

7. The socket according to claim 1 , wherein (C-1) and (C-2) are present in a weight ratio in a range of 90/10-65/35.

8. The socket according to claim 1 , wherein the composition comprises:

30-80 wt. % of the polyamide polymer;

6-25 wt. % of a combined amount of (C-1) and (C-2); and

10-40 wt. % of the fibrous reinforcing agent.

9. The socket according to claim 1 , wherein the composition has a heat distortion temperature HDT-A of at least 270° C.

10. The socket according to claim 1 , wherein the composition has a stiffness of at least 10,000 MPa, measured with the method according to ISO 527-1/2 at 20° C.

11. The socket according to claim 1 , wherein the composition has a melt flow length of at least 120 mm, measured by a spiral flow test in a spiral cavity with dimensions 280×15×1 mm at a temperature of 20° C. above Tm-A.

12. The socket according to claim 1 , wherein the composition has a flame retardancy rating, measured according to UL-94, of at least V-0 at 0.8 mm.

13. The socket according to claim 3 , wherein the intersecting walls have a thickness of about 200 micrometers (μm) or less.